title: MATLAB date: 2023-01-03 09:51:44 background: bg-[#692316] tags: categories:

• Programming intro: | This quick reference cheat sheet provides an example introduction to using the MATLAB scientific computing language to get started quickly

Getting Started

Introduction

MATLAB is short for matrix laboratory

• MATLAB official website

Matrix and array operations {.row-span-3}

MATLAB allows you to use a single arithmetic operator or function to manipulate all values ​​in a matrix

a + 10

MATLAB will execute the above statement and return the following results:

ans = 3×3
    11    13    15
    12    14    16
    17    18    20

sin(a)

MATLAB will execute the above statement and return the following results:

ans = 3×3
    0.8415    0.1411   -0.9589
    0.9093   -0.7568   -0.2794
    0.6570    0.9894   -0.5440

To transpose a matrix, use single quotes (')

a'

ans = 3×3
     1     2     7
     3     4     8
     5     6    10

Perform standard matrix multiplication using the * operator, which computes the inner product between rows and columns

p = a*inv(a)

p = 3×3
    1.0000         0         0
         0    1.0000         0
         0         0    1.0000

concatenation {.row-span-2}

Concatenation is the process of joining arrays to form larger arrays. In fact, the first array is formed by concatenating its elements. Pairs of square brackets [] are concatenation operators.

A = [a,a]

A = 3×6

     1     3     5     1     3     5
     2     4     6     2     4     6
     7     8    10     7     8    10

Concatenating arrays next to each other using commas is called horizontal concatenation. Each array must have the same number of rows. Likewise, semicolons can be used for vertical concatenation if the arrays have the same number of columns.

A = [a; a]

A = 6×3

     1     3     5
     2     4     6
     7     8    10
     1     3     5
     2     4     6
     7     8    10

Matrices and arrays{.row-span-3}

To create an array with four elements per row, separate elements with commas (,) or spaces

a = [1 2 3 4]

MATLAB will execute the above statement and return the following results:

a = 1×4
     1     2     3     4

Create a matrix with multiple rows

a = [1 3 5; 2 4 6; 7 8 10]

a = 3×3
     1     3     5
     2     4     6
     7     8    10

5×1 column vector of zeros

z = zeros(5,1)

z = 5×1
     0
     0
     0
     0
     0

Complex number

A complex number has a real part and an imaginary part, and the imaginary unit is the square root of -1.

sqrt(-1)

ans = 0.0000 + 1.0000i

To represent the imaginary part of a complex number, use i or j.

c = [3+4i, 4+3j; -i, 10j]

c = 2×2 complex

   3.0000 + 4.0000i   4.0000 + 3.0000i
   0.0000 - 1.0000i   0.0000 +10.0000i

Basic knowledge

Input the command

• | - | -
• | - | - ans | Most recently calculated answer clc | Clear the command line window diary | Record the text of the command line window into the log file format | Set the output display format home | Send cursor reset iskeyword | Determine if the input is a MATLAB keyword more | Control paging output in the command line window commandwindow | Select command window commandhistory | Open command history window

Objects

• | -
• | - DisplayFormatOptions | Output display format in the command line window

Matrices and Arrays {.row-span-5}

Create and combine arrays

• | - | -
• | - | - zeros | Create an array of all zeros ones | Create an array of all 1s rand | Uniformly distributed random numbers true | Logical value 1 (true) false | logical 0 (false) eye | identity matrix diag | Create a diagonal matrix or get the diagonal elements of a matrix blkdiag | block diagonal matrix cat | Concatenate arrays. horzcat | Concatenate arrays horizontally vertcat | Concatenate arrays vertically repelem | Repeat array element copy repmat | Repeat array copy

create grid

• | - | -

• | - | - linspace | Generate linearly spaced vectors logspace | Generate logarithmic spaced vectors freqspace | frequency spacing of frequency response meshgrid | 2D and 3D grids ndgrid | Rectangular grid in N-dimensional space Determine size, shape and order

• | - | -

• | - | - length | The length of the largest array dimension size | array size ndims | Number of dimensions of the array numel | the number of array elements isscalar | Determine whether the input is a scalar issorted | Determine if the array is sorted issortedrows | Determine whether the rows of a matrix or table are sorted isvector | Determine whether the input is a vector ismatrix | Determine whether the input is a matrix isrow | Determine whether the input is a row vector iscolumn | Determine whether the input is a column vector isempty | Determine whether the array is empty

Refactor and rearrange

• | - | -
• | - | - sort | Sort array elements sortrows | Sort matrix rows or table rows flip | Flip the order of elements fliplr | Flip the array from left to right flipud | Flip the array from top to bottom rot90 | Rotate an array by 90 degrees transpose | Transpose a vector or matrix ctranspose | complex conjugate transpose permute | permute array dimension ipermute | Inverse permutation of array dimensions. circshift | Circular shift array shiftdim | shift array dimension reshape | Reshape array squeeze | Remove dimensions of length 1

index

• | - | -
• | - | - colon | vector creation, array subscript and for loop iteration end | Terminate a code block or indicate the maximum array index ind2sub | Convert linear index to subscript sub2ind | Convert subscript to linear index

Value type {.row-span-2}

Create numeric variables

• | - | -
• | - | - double | double precision array single | single precision array int8 | 8-bit signed integer array int16 | 16-bit signed integer array int32 | 32-bit signed integer array int64 | 64-bit signed integer array uint8 | Array of 8-bit unsigned integers uint16 | 16-bit unsigned integer array uint32 | 32-bit unsigned integer array uint64 | 64-bit unsigned integer array

Convert between numeric types

• | - | -
• | - | - cast | Convert variables to different data types typecast | Convert data types without changing the underlying data

query type and value

• | - | -
• | - | - allfinite | Determine if all array elements are finite anynan | Determine if any array element is NaN isinteger | Determine whether the input is an integer array isfloat | Determine whether the input is a floating-point array isnumeric | Determine whether the input is a numeric array isreal | Determine whether the array uses complex storage isfinite | Determine which array elements are finite isinf | Determine which array elements are infinite isnan | Determine which array elements are NaN

Value range

• | - | -
• | - | - eps | Floating point relative precision flintmax | The largest consecutive integer in floating point format Inf | Create an array with all values ​​Inf intmax | The maximum value of a specific integer type intmin | The minimum value of a specific integer type NaN | Create an array where all values ​​are NaN realmax | The largest positive floating point number realmin | Minimum standard floating point number

Loops and conditional statements

• | -
• | - if, elseif, else | Execute statement when condition is true switch, case, otherwise | Execute one of multiple sets of statements for | A for loop used to repeat a specified number of times while | A while loop that executes repeatedly while a condition is true try, catch | Execute the statement and catch the resulting error break | Terminate execution of a for or while loop return | Return control to the calling script or function continue | Passes control to the next iteration of a for or while loop pause | Temporarily suspend the execution of MATLAB parfor | Parallel for loop end | Terminate a code block or indicate the maximum array index {.style-list}

Array of strings

• | - | -
• | - | - string | string array strings | Create a string array that does not contain characters join | Merge strings plus | Add numbers, append strings

Character array

• | - | -
• | - | - char | character array cellstr | Convert to a cell array of character vectors blanks | Create a blank character array newline | Create newline

Character or string array

• | - | -
• | - | - compose | Format data into multiple strings sprintf | Format data as string or character vector strcat | Concatenate strings horizontally append | Merge strings

Char or string -convert input arguments

• | -
• | - convertCharsToStrings | convert character array to string array, other arrays remain unchanged convertStringsToChars | Convert string array to character array, other arrays remain unchanged convertContainedStringsToChars | Convert an array of strings at any level of a cell array or structure {.style-list}

CHAR or STRING -convert between numeric and string

• | - | -
• | - | - double | double precision array string | string array str2double | Convert a string to a double value num2str | Convert numbers to character arrays

Character or string -determine type and attributes {.row-span-2}

type of data

• | - | -
• | - | - ischar | Determine whether the input is a character array iscellstr | Determines if input is a cell array of character vectors isstring | Determine whether the input is an array of strings isStringScalar | Determine whether the input is a string array containing one element

text attribute

• | - | -
• | - | - strlength | string length isstrprop | Determine which characters in the input string belong to the specified category isletter | Determine which characters are letters isspace | Determine which characters are whitespace characters

character or string -find and replace {.row-span-2}

look up

• | - | -
• | - | - contains | Determine if there is a pattern in the string matches | Determine if a pattern matches a string count | Count the number of occurrences of a pattern in a string endsWith | Determine if a string ends with a pattern startsWith | Determine whether a string starts with a pattern strfind | Find a string in other strings sscanf | Read formatted data from a string

replace

• | - | -
• | - | - replace | Find and replace one or more substrings replaceBetween | Replace the substring between the start and end strrep | Find and replace substring

String matching pattern -build pattern

• | - | -
• | - | - pattern | pattern for searching and matching text

String match pattern -character match pattern

• | - | -
• | - | - alphanumericsPattern | match alphanumeric characters characterListPattern | Match characters in the list digitsPattern | Match digit characters lettersPattern | match letter pattern whitespacePattern | match whitespace characters wildcardPattern | Match as few characters of any type as possible

String matching pattern -pattern search rules

• | - | -
• | - | - optionalPattern | Make pattern matching optional possessivePattern | Match pattern without backtracking caseSensitivePattern | Match patterns in a case-sensitive manner caseInsensitivePattern | Match patterns in a case-insensitive manner asFewOfPattern | The number of pattern matches should be as few as possible asManyOfPattern | Pattern matching as many times as possible

String matching pattern -Boundary pattern {.row-span-2}

• | -
• | - alphanumericBoundary | Matches the boundary between alphanumeric and non-alphanumeric characters digitBoundary | Matches the boundary between digit characters and non-digit characters letterBoundary | Matches the boundary between alphabetic and non-alphabetic characters whitespaceBoundary | Matches the boundary between whitespace and non-whitespace characters lineBoundary | match the beginning or end of a line textBoundary | match the beginning or end of the text lookAheadBoundary | match the boundary before the specified pattern lookBehindBoundary | Boundary after matching the specified pattern {.style-list}

String matching pattern -custom pattern display

• | - | -
• | - | - maskedPattern | pattern with specified display name namedPattern | Specify a named pattern

String matching pattern -regular expression

• | - | -
• | - | - regexp | match regular expression (case sensitive) regexpi | Match regular expressions (case insensitive) regexprep | Replace text using regular expressions regexptranslate | Convert text to regular expressions regexpPattern | Match the pattern of the specified regular expression

String matching pattern -join and split

• | - | -
• | - | - join | Merge strings plus | Add numbers, append strings split | Split string at delimiter splitlines | Split a string at newlines strjoin | join the strings in the array strsplit | Splits a string or character vector at the specified delimiter strtok | Selected string part extract | Extract a substring from a string extractAfter | Extract the substring after the specified position extractBefore | Extract the substring before the specified position extractBetween | Extract the substring between the starting point and the ending point

String editing {.row-span-2}

• | - | -
• | - | - erase | Delete a substring in a string eraseBetween | Delete the substring between the start and end extract | Extract a substring from a string extractAfter | Extract the substring after the specified position extractBefore | Extract the substring before the specified position extractBetween | Extract the substring between the starting point and the ending point insertAfter | Insert a string after the specified substring insertBefore | Insert a string before the specified substring pad | Add leading or trailing characters to a string strip | Remove leading and trailing characters in a string lower | convert string to lowercase upper | convert string to uppercase reverse | Reverse the order of characters in a string deblank | Remove trailing blanks at the end of a string strtrim | Remove leading and trailing blanks from a string strjust | align string

String comparison

• | - | -
• | - | - matches | Determine if a pattern matches a string strcmp | Compare strings strcmpi | Compare strings (case insensitive) strncmp | compares the first n characters of a string (case sensitive) strncmpi | Compare the first n characters of a string (case insensitive )

Basic Arithmetic {.row-span-3}

Addition

• + Add numbers, append strings
• sum sum of array elements
• cumsum cumulative sum
• movsum moving sum {.cols-2 style-none}

Subtraction

• - subtraction
• diff difference and approximate derivative {.cols-2 style-none}

Multiplication

• | - | -
• | - | - .* | Multiplication * | Matrix multiplication prod | product of array elements cumprod | cumulative product pagemtimes | Matrix multiplication by page tensorprod | Tensor products between two tensors

Division

• | - | -
• | - | - ./ | Array right division .\ | Array left division / | Solve the system of linear equations xA = B about x \ | Solve the system of linear equations Ax = B with respect to x

Power

• .^ Element-wise exponentiation
• ^ matrix power {.cols-2}

Transpose

• | - | -
• | - | - .' | Transpose a vector or matrix ' | complex conjugate transpose pagetranspose | Transpose by page pagectranspose | Complex conjugate transpose by page

Array notation

• uminus unary subtraction
• uplus unary addition {.cols-2}

Modular division and rounding

• | - | -
• | - | - mod | Remainder after division (modulo operation) rem | Remainder after division idivide | Divisibility with rounding options ceil | round towards positive infinity fix | round towards zero floor | round towards negative infinity round | round to the nearest decimal or integer

Custom Binary Functions

• | - | -
• | - | - bsxfun | Apply element-wise operations on two arrays (with implicit expansion enabled)

Relational operations

value comparison

• | - | -
• | - | - == | Determine equality >= | Determine greater than or equal to > | Determine greater than <= | Determine less than or equal to < | Determine less than ~= | Determine Inequality isequal | Determine array equality isequaln | Test array equality, treat NaN values ​​as equal

Logical (Boolean) operations

true or false condition

• | - | -
• | - | - Short-circuit &&, || | Logical operators with short-circuit function & | Computational logic AND ~ | Computational logic NOT | | Calculation logic OR xor | Compute logical exclusive OR all | Determine whether all array elements are non-zero or true any | Determine if any array elements are non-zero false | logical 0 (false) find | Find the index and value of non-zero elements islogical | Determine whether the input is a logical array logical | Convert numeric values ​​to logical values true | Logical value 1 (true)

Set operation

union, intersection, set relationship

• | - | -
• | - | - intersect | Set the intersection of two arrays ismember | Determine whether an array element is a set array member setdiff | Set the difference between two arrays setxor | Set XOR of two arrays union | Set the union of two arrays unique | Unique value in an array ismembertol | set membership within tolerance uniquetol | unique values ​​within tolerance join | Merge two tables or timetables row by row using a key variable innerjoin | Inner join between two tables or timetables outerjoin | Outer join between two tables or timetables

Bitwise operations

set, offset, or compare specific bitfields

• | - | -
• | - | - bitand | Bitwise AND bitor | Bitwise OR bitxor | Bitwise XOR bitcmp | Bitwise complement bitget | Get the bit at the specified position bitset | Set the bit at the specified position bitshift | Shift bits by specified number of bits swapbytes | swap byte order

Data import and export

text file -read and write table or timetable {.row-span-2}

Basic import and export

• | - | -
• | - | - readtable | Create a table based on a file writetable | write table to file readtimetable | Create a timetable based on a file writetimetable | Write timetable to file

Define import rules

• | -
• | - detectImportOptions | Generate import options based on file content delimitedTextImportOptions | Import options object for delimited text fixedWidthImportOptions | Import options object for fixed-width text files xmlImportOptions | Import options object for XML file htmlImportOptions | Import options object for HTML files wordDocumentImportOptions | Microsoft Word file import options object getvaropts | Get variable import options setvaropts | Set variable import options setvartype | Set variable data type preview | Preview eight lines of data in the file with import options {.style-list}

Text files -read and write matrices and arrays

• | - | -
• | - | - readmatrix | Read a matrix from a file writematrix | Write matrix to file readcell | Read a cell array from a file writecell | Write a cell array to a file readvars | Read variables from a file textscan | Read formatted data from a text file or string type | Display file content fileread | Read file content in text format readlines | Read lines of a file as an array of strings writelines | Write text to file

Spreadsheet -Read and Write Table or Timetable {.row-span-2}

Basic import and export

• | - | -
• | - | - readtable | Create a table from a file writetable | write table to file readtimetable | Create a timetable from a file writetimetable | Write timetable to file sheetnames | Get sheetnames from a spreadsheet file {.style-list}

Define import rules

• | -
• | - detectImportOptions | Generate import options based on file content spreadsheetImportOptions | Spreadsheet import options object getvaropts | Get variable import options setvaropts | Set variable import options setvartype | Set variable data type preview | Preview eight rows of data in a file with import options {.style-list}

Spreadsheet -Reading and writing matrices and arrays

• | - | -
• | - | - readmatrix | Read a matrix from a file writematrix | Write matrix to file readcell | Read a cell array from a file writecell | Write a cell array to a file readvars | Read variables from a file importdata | Load data from a file

images

• | - | -
• | - | - imfinfo | Information about graphics files imread | Reads an image from a graphics file imwrite | Writes an image to a graphics file Tiff | MATLAB entry for LibTIFF library routines

Read or write a NetCDF file {.row-span-2}

• | - | -
• | - | - nccreate | Create variables in a NetCDF file ncdisp | Displays NetCDF data source content in the command line window ncinfo | Returns information about a NetCDF data source ncread | Read variable data from a NetCDF data source ncreadatt | Read attribute values ​​in a NetCDF data source ncwrite | Write data to a NetCDF file ncwriteatt | Write attributes to a NetCDF file ncwriteschema | Adds a NetCDF schema definition to a NetCDF file

NetCDF library package -library functions

• | -
• | - netcdf.getChunkCache | Retrieves the chunk cache settings for the NetCDF library netcdf.inqLibVers | Returns NetCDF library version information netcdf.setChunkCache | Sets the default chunk cache settings for the NetCDF library netcdf.setDefaultFormat | Change the default netCDF file format {.style-list}

NetCDF library package -file operations {.row-span-2}

• | -
• | - netcdf.abort | restores the most recent netCDF file definition netcdf.close | Closes a netCDF file netcdf.create | Create a new NetCDF dataset netcdf.endDef | End netCDF file definition mode netcdf.inq | returns information about a netCDF file netcdf.inqFormat | Determines the format of a NetCDF file netcdf.inqGrps | Retrieves an array of subgroup IDs netcdf.inqUnlimDims | Retrieves a list of infinite dimensions in a group netcdf.open | Open NetCDF data source netcdf.reDef | puts an open netCDF file into definition mode netcdf.setFill | Set netCDF fill mode netcdf.sync | Synchronize netCDF files to disk

NetCDF Library Package -Dimensions

• | - | -
• | - | - netcdf.defdim | Create netCDF dimensions netcdf.inqDim | Returns netCDF dimension names and lengths netcdf.inqDimID | Returns the dimension ID netcdf.renameDim | Change netCDF dimension names

NetCDF library package -group

• | - | -
• | - | - netcdf.defGrp | Create groups in a NetCDF file netcdf.inqDimIDs | Retrieves a list of dimension identifiers in a group netcdf.inqGrpName | Retrieve group name netcdf.inqGrpNameFull | the full pathname of the group netcdf.inqGrpParent | Retrieves the ID of the parent group. netcdf.inqNcid | Returns the ID of a named group netcdf.inqVarIDs | IDs of all variables in the group

NetCDF library package -variable {.row-span-3}

• | -
• | - netcdf.defVarFill | Defines the fill parameter for a NetCDF variable netcdf.defVar | Create a NetCDF variable netcdf.defVarChunking | Defines chunking behavior for NetCDF variables netcdf.defVarDeflate | Defines compression parameters for NetCDF variables netcdf.defVarFletcher32 | Defines validation parameters for NetCDF variables netcdf.getVar | Read data in a NetCDF variable netcdf.inqVar | Information about variables netcdf.inqVarChunking | Determines chunking settings for NetCDF variables netcdf.inqVarDeflate | Determines compression settings for NetCDF variables netcdf.inqVarFill | Determines the fill parameter value for a NetCDF variable netcdf.inqVarFletcher32 | About Fletcher32 checksum settings for NetCDF variables netcdf.inqVarID | Returns the ID associated with the variable name netcdf.putVar | Writes data to a netCDF variable netcdf.renameVar | Change netCDF variable name {.style-list}

NetCDF library package -properties

• | - | -
• | - | - netcdf.copyAtt | Copy an attribute to a new location netcdf.delAtt | Remove netCDF attribute netcdf.getAtt | Returns the NetCDF attribute netcdf.inqAtt | Returns information about netCDF attributes netcdf.inqAttID | Returns the ID of a netCDF attribute netcdf.inqAttName | Returns the netCDF attribute name netcdf.putAtt | Write netCDF attributes netcdf.renameAtt | Change Attribute Name

NetCDF library package -user-defined types

NetCDF library package -Utilities

• | -
• | - netcdf.getConstant | returns the value of the named constant netcdf.getConstantNames | returns a list of constants known to the netCDF library {.style-list}

Read or write HDF5 files

• | - | -
• | - | - h5create | Create HDF5 dataset h5disp | Display the content of HDF5 files h5info | Information about HDF5 files h5read | Read data from HDF5 dataset h5readatt | Read attributes from HDF5 files h5write | Write HDF5 dataset h5writeatt | Write HDF5 attributes

HDF5 library package {.row-span-4}

• | -
• | - Library (H5) | General-purpose functions for use with entire HDF5 library Attribute (H5A) | Metadata associated with datasets or groups Dataset (H5D) | Multidimensional arrays of data elements and supporting metadata Dimension Scale (H5DS) | Dimension scale associated with dataset dimensions Error (H5E) | Error handling File (H5F) | HDF5 file access Group (H5G) | Organization of objects in file Identifier (H5I) | HDF5 object identifiers Link (H5L) | Links in HDF5 file MATLAB (H5ML) | MATLAB utility functions not part of the HDF5 C library Object (H5O) | Objects in file Property (H5P) | Object property lists Reference (H5R) | HDF5 references Dataspace (H5S) | Dimensionality of dataset Datatype (H5T) | Datatype of elements in a dataset {.style-list}

HDF4 Files -Advanced Functions

• | -
• | - hdfinfo | Information about HDF4 or HDF-EOS files hdfread | Read data from HDF4 or HDF-EOS files imread | Read an image from a graphics file imwrite | Write image to graphics file

Low-level functions -package {.row-span-3}

• | -
• | - matlab.io.hdf4.sd | Interact directly with the HDF4 multi-file scientific dataset (SD) interface matlab.io.hdfeos.gd | Low-level access to HDF-EOS grid data matlab.io.hdfeos.sw | Low-level access to HDF-EOS segmented files

Low Level Functions -Functions

• | -
• | - hdfan | The entry of HDF multi-file annotation (AN) interface hdfhx | The entry of HDF external data (HX) interface hdfh | The entry of HDF H interface hdfhd | The entry of HDF HD interface hdfhe | The entry of HDF HE interface hdfml | Utilities for use with MATLAB HDF entry functions hdfpt | Interface of HDF-EOS point object hdfv | The entry of HDF Vgroup (V) interface hdfvf | The entry of VF function in HDF Vdata interface hdfvh | The entry of VH function in HDF Vdata interface hdfvs | The entry of VS function in HDF Vdata interface hdfdf24 | HDF 24-bit raster image (DF24) interface entry hdfdfr8 | HDF 8-bit raster image (DFR8) interface entry

FITS file -function

• | -
• | - fitsdisp | Display FITS metadata fitsinfo | Information about FITS files fitsread | Read data in FITS files fitswrite | Write image to FITS file

FITS files -file access

• | -
• | - createFile | Create FITS file openFile | Open FITS file openDiskFile | Open FITS file closeFile | Close FITS file deleteFile | Delete FITS file fileName | The name of the FITS file fileMode | I/O mode for FITS files

FITS files -image processing

• | -
• | - createImg | Create FITS image getImgSize | image size getImgType | The data type of the image insertImg | Insert a FITS image after the current image readImg | read image data setBscale | Reset image scaling writeImg | write FITS image

FITS file -keyword {.row-span-2}

• | -
• | - readCard | Header record of keywords readKey | Keyword readKeyCmplx | A keyword in the form of a complex scalar value readKeyDbl | Keyword in the form of double precision value readKeyLongLong | Keyword in the form of int64 readKeyLongStr | long string value readKeyUnit | The physical unit string in the key readRecord | Header record specified by number writeComment | Write or append COMMENT keyword to CHU writeDate | Write DATE keyword to CHU writeKey | Update or add new keywords to the current HDU writeKeyUnit | write physical unit string writeHistory | Write or append HISTORY keyword to CHU deleteKey | Delete key by name deleteRecord | Delete keywords by record number getHdrSpace | The number of keywords in the header

FITS files -Header Data Unit (HDU) access

• | -
• | - copyHDU | Copy current HDU from one file to another getHDUnum | The number of the current HDU in the FITS file getHDUtype | current HDU type getNumHDUs | Total number of HDUs in FITS file movAbsHDU | Move to Absolute HDU Numbering movNamHDU | Move to the first HDU containing a specific type and keyword value movRelHDU | Move relative amount of HDU from current HDU writeChecksum | Calculate and write the checksum of the current HDU deleteHDU | Delete the current HDU in the FITS file

FITS files -image compression

• | -
• | - imgCompress | Compress HDU from one file to another isCompressedImg | Determine whether the current image is compressed setCompressionType | Set image compression type setHCompScale | Set the scaling parameters of the HCOMPRESS algorithm setHCompSmooth | Sets smoothing for images compressed with HCOMPRESS setTileDim | Set tile dimensions

FITS file -ASCII table and binary table {.row-span-3}

• | -
• | - createTbl | Create a new ASCII or binary table extension insertCol | Insert a column into a table insertRows | Insert rows into the table insertATbl | Insert an ASCII table after the current HDU insertBTbl | Insert a binary table behind the current HDU deleteCol | Delete a column from a table deleteRows | Delete rows from the table getAColParms | ASCII table information getBColParms | binary table information getColName | table column name getColType | Data type, repeat value, width of scaled column getEqColType | column data type, repeated value, width getNumCols | The number of columns in the table getNumRows | the number of rows in the table readATblHdr | Read the header information from the current ASCII table readBTblHdr | Read the header information from the current binary table readCol | Reads rows of ASCII or binary table columns setTscale | reset image scaling writeCol | Write elements to an ASCII or binary table column

FITS files -Utilities

• | -
• | - getConstantValue | specify the constant value getVersion | The revision number of the CFITSIO library getOpenFiles | list of opened FITS files

Stripe interleaved file

• | -
• | - multibandread | Read a striped interleaved file from a binary file multibandwrite | Write strip interleaved data to a file

Common Data Format (CDF)

• | -
• | - cdfinfo | Information on Common Data Format (CDF) files cdfread | Read data in Common Data Format (CDF) files cdfepoch | Converts a date literal or date sequence value to a date in CDF format todatenum | Convert CDF epoch objects to MATLAB date serial values

Bag

• | -
• | - cdflib | Direct interaction with CDF library

Read video data

• | -
• | - VideoReader | Create an object to read a video file read | Read one or more video frames readFrame | Read the next video frame hasFrame | Determine whether there are video frames available for reading getFileFormats | File formats supported by VideoReader mmfileinfo | Information about multimedia files

Write video data

• | -
• | - VideoWriter | Create an object to write a video file open | Open a file to write video data writeVideo | Write video data to a file close | close the file after writing video data getProfiles | Description files and file formats supported by VideoWriter

Read or write audio

• | -
• | - audioread | Read audio files audiowrite | Write audio files lin2mu | Convert linear audio signal to mu-law mu2lin | Convert mu-law audio signal to linear format audioinfo | Information about audio files

Play audio

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• | - audioplayer | Object for playing audio isplaying | Determine whether playback is in progress pause | Pause playback or recording play | Play audio from audioplayer object playblocking | Play audio in audioplayer object, keep control until playback is complete resume | Resume playback or recording from the paused state stop | Stop playing or recording

Record audio

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• | - audiorecorder | object for recording audio getaudiodata | Store the recorded audio signal in a numeric array getplayer | Create an associated audioplayer object isrecording | Determine if recording is in progress record | Record audio into audiorecorder object recordblocking | Record audio into an audiorecorder object, keep control until recording is complete

Play sound

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• | - audiodevinfo | Information about audio devices audiodevreset | Refresh the list of available audio devices sound | Convert signal data matrix to sound soundsc | Scale data and play it as sound beep | generate operating system beep

Reading and writing XML documents

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• | - matlab.io.xml.dom.DOMWriter | Write serialized XML documents Injector matlab.io.xml.dom.EntityResolver | Abstract base class of entity resolver matlab.io.xml.dom.FileWriter | Writer for creating text files matlab.io.xml.dom.Locator | The location of the element in the XML file matlab.io.xml.dom.Parser | XML markup parser matlab.io.xml.dom.ParserConfiguration | XML parser options matlab.io.xml.dom.ParseError | Specified XML tag parsing error matlab.io.xml.dom.ParseErrorHandler | Abstract base class for parse error handlers matlab.io.xml.dom.ParseErrorLocator | Specifies location of parse error matlab.io.xml.dom.ParseErrorSeverity | Indicates the severity of XML tag parsing errors enum class matlab.io.xml.dom.ResourceIdentifier | XML resource identifier matlab.io.xml.dom.ResourceIdentifierType | XML resource identifier type matlab.io.xml.dom.WriterConfiguration | XML DOM Writer Options {.style-list-arrow}

W3C DOM

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• | - matlab.io.xml.dom.Attr | Attributes of XML elements matlab.io.xml.dom.CDATASection | CDATA section matlab.io.xml.dom.Comment | Comments in XML documents matlab.io.xml.dom.Document | XML document matlab.io.xml.dom.DocumentFragment | document node group matlab.io.xml.dom.DocumentType | document type matlab.io.xml.dom.Element | element of XML document matlab.io.xml.dom.Entity | Entity defined by document type matlab.io.xml.dom.NamedNodeMap | A set of document nodes with names matlab.io.xml.dom.NodeList | document node list matlab.io.xml.dom.Notation | Notation in document type definition matlab.io.xml.dom.ProcessingInstruction | XML processing instruction matlab.io.xml.dom.Text | Text in an XML document matlab.io.xml.dom.TypeInfo | schema type information {.style-list-arrow}

XML Transformation

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• | - matlab.io.xml.transform.CompiledStylesheet | Compiled stylesheet matlab.io.xml.transform.ResultDocument | Store the transformation result as a document matlab.io.xml.transform.ResultString | Store the transformation result as a string matlab.io.xml.transform.ResultFile | Store the transformation result as a file matlab.io.xml.transform.SourceDocument | XML source document for transformation matlab.io.xml.transform.SourceFile | XML source file for transformation matlab.io.xml.transform.SourceString | XML source string for transformation string matlab.io.xml.transform.StylesheetSourceDocument | Stylesheet source for transformation document matlab.io.xml.transform.StylesheetSourceFile | Stylesheet source for transformation document matlab.io.xml.transform.StylesheetSourceString | XSL source string for transformation string matlab.io.xml.transform.Tracer | Trace execution of stylesheet {.style-list-arrow}

XPath query

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• | - matlab.io.xml.xpath.CompiledExpression | Compiled XPath expression matlab.io.xml.xpath.EvalResultType | The result type of XPath expression calculation matlab.io.xml.xpath.Evaluator | XPath expression evaluator matlab.io.xml.xpath.PrefixResolver | For namespace prefix resolver Abstract base class for {.style-list-arrow}

JSON format

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• | - jsondecode | Decode text in JSON format jsonencode | Create JSON-formatted text {.style-list} from structured MATLAB data

Workspace variables and MAT-file {.row-span-2}

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• | - load | Load file variables into the workspace save | Save workspace variables to a file matfile | Access and change variables in a MAT-file without loading the file into memory disp | Display the value of the variable formattedDisplayText | Capture display output as a string who | List variables in the workspace whos | List variables in the workspace with their size and type clear | Delete items from the workspace and release system memory clearvars | Clear variables in memory openvar | Open a workspace variable in the variable editor or other graphical editing tools Workspace Browser | Open the Workspace Browser to manage the workspace

Low-level file I/O {.row-span-2}

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• | - fclose | close one or all open files feof | Detect the end of the file ferror | File I/O error message fgetl | Read lines in a file and remove line breaks fgets | Read lines in a file and keep newlines fileread | Read file content in text format fopen | Open a file or get information about opening a file fprintf | Write data to a text file fread | Read data in binary files frewind | Move the file position indicator to the beginning of the opened file fscanf | Read the data in the text file fseek | Move to the specified position in the file ftell | current location fwrite | Write data to a binary file

Serial and USB Communication -Connection and Configuration

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• | - serialportlist | List of serial ports connected to your system serialport | Connect to a serial port configureTerminator | Set the terminator for ASCII string communication with the serial port configureCallback | Set callback function and trigger conditions for communication with serial port devices

Serial and USB communication -read and write

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• | - read | Read data from the serial port readline | Read ASCII string data line from serial port write | write data to serial port writeline | Write ASCII data line to serial port

Serial and USB communication -control pins and memory

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• | - flush | Clear the serial port device buffer getpinstatus | Get the serial port status setRTS | Set the serial port RTS pin setDTR | Set the serial DTR pin

TCP/IP communication -connection and configuration

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• | - tcpclient | Create a TCP/IP client connection to a TCP/IP server echotcpip | Start or stop the TCP/IP echo server configureTerminator | Set terminator for ASCII string communication with remote host via TCP/IP configureCallback | Set callback function and trigger condition for communication with remote host via TCP/IP {.style-list}

TCP/IP communication -read and write

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• | - read | Read data on a remote host via TCP/IP readline | Read ASCII string data line from remote host via TCP/IP write | Write data to a remote host via TCP/IP writeline | Write ASCII data line to remote host via TCP/IP flush | Flush buffers for communication with remote hosts via TCP/IP {.style-list}

Bluetooth communication -connection and configuration

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• | - bluetoothlist | Scan for nearby Bluetooth classic devices bluetooth | Connect to Bluetooth classic device configureTerminator | Set terminator for ASCII string communication with Bluetooth device configureCallback | Set callback function and trigger condition for communication with Bluetooth device {.style-list}

Bluetooth communication -read and write {.row-span-2}

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• | - read | Read data from a Bluetooth device readline | Read ASCII string data line from Bluetooth device write | write data to Bluetooth device writeline | Write ASCII data line to Bluetooth device flush | Clear Bluetooth device buffer {.style-list}

Bluetooth Low Energy Communication {.row-span-2}

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• | - blelist | Scan for nearby low energy Bluetooth peripherals ble | Connect to low energy Bluetooth peripherals characteristic | Access to characteristics of Bluetooth low energy peripherals descriptor | Access descriptors on Bluetooth low energy peripherals read | Read characteristic or descriptor data on a Bluetooth low energy peripheral device write | Write data to a characteristic or descriptor of a Bluetooth low energy peripheral device subscribe | Subscribe to characteristic notifications or instructions unsubscribe | Unsubscribe characteristic notifications and instructions {.style-list}

Web Services

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• | - webread | Read content from RESTful web services webwrite | Write data to RESTful web service websave | Save content in RESTful web service to file weboptions | Specify parameters for RESTful web services web | Open a webpage or file in a browser sendmail | Send email to address list

FTP file operations {.row-span-2}

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• | - ftp | Connect to an FTP server to access its files sftp | Connection to SFTP server to access its files ascii | Set FTP transfer mode to ASCII binary | Set FTP transfer mode to binary cd | Change or view the current folder on an SFTP or FTP server close | Close the connection to the SFTP or FTP server delete | Delete files on SFTP or FTP server dir | List folder contents on SFTP or FTP server mget | Download files from SFTP or FTP server mkdir | Create a new folder on an SFTP or FTP server mput | Upload files or folders to SFTP or FTP server rename | Rename a file on an SFTP or FTP server rmdir | Delete a folder on an SFTP or FTP server

Internet of Things (IoT) Data

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• | - thingSpeakRead | Read data stored in ThingSpeak channel thingSpeakWrite | write data to ThingSpeak channel