what lists the path for the current folder, and lists all files and folders relevant to MATLAB found in the current folder. Files listed are M, MAT, MEX, MDL, and P-files. Folders listed are all class and package folders.

what folderName lists path, file, and folder information for folderName.

what className lists path, file, and folder information for method folder @className. For example, what cfit lists the MATLAB files and folders in toolbox/curvefit/curvefit/@cfit.

what packageName lists path, file, and folder information for package folder +packageName. For example, what commsrc lists the MATLAB files and folders in toolbox/comm/comm/+commsrc.

s = what('folderName') returns the results in a structure array with the fields shown in the following table.

Field	Description
`path`	Path to folder
`m`	Cell array of MATLAB program file names
`mat`	Cell array of MAT-file names
`mex`	Cell array of MEX-file names
`mdl`	Cell array of MDL-file names
`p`	Cell array of P-file names
`classes`	Cell array of class folders
`packages`	Cell array of package folders

Examples

List the MATLAB files and folders in C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo\+audiovideo, where Rnnnn represents the folder for the MATLAB release, for example, R2012a:

what audiovideo

MATLAB Code files in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo\+audiovideo

FileFormatInfo    

Packages in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo\+audiovideo

internal  writer    


MATLAB Code files in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo

Contents            avifinfo            sound  
audiodevinfo        aviinfo             soundsc
audioplayerreg      aviread             wavfinfo
audiorecorderreg    lin2mu              wavplay
audiouniquename     mmcompinfo          wavread
aufinfo             mmfileinfo          wavrecord
auread              movie2avi           waywrite
auwrite             mu2lin
avgate              prefspanel

MAT-files in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo

chirp         handel          splat
gong          laughter        train

Classes in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo

VideoReader    audioplayer    avifile        
VideoWriter    audiorecorder  mmreader       

Packages in folder C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\audiovideo

audiovideo

Obtain a structure array containing the file and folder names in toolbox/matlab/codetools that are relevant to MATLAB, where Rnnnn represents the folder for the MATLAB release, for example, R2012a:

s = what('codetools')

s = 

        path: 'C:\Program Files\MATLAB\Rnnnn\toolbox\matlab\codetools'
           m: {76x1 cell}
         mat: {0x1 cell}
         mex: {0x1 cell}
         mdl: {0x1 cell}
           p: {0x1 cell}
     classes: {2x1 cell}
    packages: {3x1 cell}

Find the supporting files for one of the packages in the Communications System Toolbox product:

p1 = what('comm');
p1.packages
ans = 

    'gpu'
    'internal'


ans = 

    'internal'.
.
.
p2 = what('commsrc');
p2.m
ans = 
    'abstractJitter.m'
    'abstractPulse.m'
    'combinedjitter.m'
    'diracjitter.m'
    'periodicjitter.m'
    'randomjitter.m'