How do I check if there is a function with the same name

In addition to the functions that come with matlab, I have added some additional toolboxes, so I want to make sure that there are more than one function with the same name in my directory, who can teach me.

Answer 1

[Star Strider]

The which function can be helpful.

which which -all

built-in (/MATLAB/toolbox/matlab/general/which)

If there are any others in your MATLAB search path, it should display them as well.

.

[John D'Errico]

Which is the first choice of course, but exist is another option.

[Star Strider]

@John D'Errico — Noted. Thank you.

[中祥 范]

Thank you for your answer, but what I want to do is check if there are any functions with the same name in my path.

The 'which' function seems to only check one by one.

[Star Strider]

It will detect all of them with the -all flag.

For example, the extremely useful matrix-left-divide (the \ operator) called mldivide, \ —

which mldivide -all

built-in (/MATLAB/toolbox/matlab/ops/mldivide)
built-in (/MATLAB/toolbox/matlab/ops/@double/mldivide)                % double method
built-in (/MATLAB/toolbox/matlab/ops/@int16/mldivide)                 % int16 method
built-in (/MATLAB/toolbox/matlab/ops/@int32/mldivide)                 % int32 method
built-in (/MATLAB/toolbox/matlab/ops/@int64/mldivide)                 % int64 method
built-in (/MATLAB/toolbox/matlab/ops/@int8/mldivide)                  % int8 method
built-in (/MATLAB/toolbox/matlab/ops/@logical/mldivide)               % logical method
built-in (/MATLAB/toolbox/matlab/ops/@single/mldivide)                % single method
built-in (/MATLAB/toolbox/matlab/ops/@uint16/mldivide)                % uint16 method
built-in (/MATLAB/toolbox/matlab/ops/@uint32/mldivide)                % uint32 method
built-in (/MATLAB/toolbox/matlab/ops/@uint64/mldivide)                % uint64 method
built-in (/MATLAB/toolbox/matlab/ops/@uint8/mldivide)                 % uint8 method
/MATLAB/toolbox/matlab/datatypes/duration/@duration/mldivide.m        % duration method
/MATLAB/toolbox/matlab/timeseries/@timeseries/mldivide.m              % timeseries method
mldivide is a built-in method                                         % matlab.internal.capability.Capability method
mldivide is a built-in method                                         % connector.internal.LoggerLevel method
mldivide is a built-in method                                         % matlab.lang.OnOffSwitchState method
/MATLAB/toolbox/matlab/timeseries/+tsdata/@datametadata/mldivide.m    % tsdata.datametadata method
mldivide is a built-in method                                         % matlab.internal.reference.property.RefEntityType method
mldivide is a built-in method                                         % matlab.internal.reference.api.EntityPrecision method
mldivide is a built-in method                                         % matlab.internal.reference.property.DeprecationStatus method
mldivide is a built-in method                                         % matlab.internal.reference.property.FunctionType method
mldivide is a built-in method                                         % matlab.internal.reference.property.SyntaxType method
mldivide is a built-in method                                         % matlab.internal.reference.api.EntityCaseSensitivity method
mldivide is a built-in method                                         % simulink.FindSystemTask.Status method
mldivide is a built-in method                                         % mf.zero.meta.Language method
mldivide is a built-in method                                         % dig.config.CommandType method
mldivide is a built-in method                                         % dig.config.HorizontalAlignment method
mldivide is a built-in method                                         % dig.config.ResourceState method
mldivide is a built-in method                                         % dig.config.ResourceType method
mldivide is a built-in method                                         % dig.model.DisplayState method
mldivide is a built-in method                                         % dig.model.EventDataType method
mldivide is a built-in method                                         % dig.model.FunctionType method
mldivide is a built-in method                                         % dig.model.ValidInBdType method
mldivide is a built-in method                                         % dig.model.ViewMode method
mldivide is a built-in method                                         % matlab.unittest.internal.fixtures.FolderScope method
mldivide is a built-in method                                         % matlab.automation.Verbosity method
mldivide is a built-in method                                         % matlab.internal.timer.CallBackTypeEnum method
mldivide is a built-in method                                         % matlab.internal.timer.BusyModeEnum method
mldivide is a built-in method                                         % matlab.internal.timer.ExecutionModeEnum method
/MATLAB/toolbox/matlab/bigdata/@tall/mldivide.m                       % tall method
built-in                                                              % gpuArray method
/MATLAB/toolbox/econ/econ/@LagOp/mldivide.m                           % LagOp method
/MATLAB/toolbox/parallel/array/distributed/@distributed/mldivide.m    % distributed method
/MATLAB/toolbox/parallel/array/distributed/@codistributed/mldivide.m  % codistributed method
/MATLAB/toolbox/parallel/gpu/gpu/@gpuArray/mldivide.m                 % gpuArray method
/MATLAB/toolbox/shared/controllib/engine/@StaticModel/mldivide.m      % StaticModel method
/MATLAB/toolbox/shared/controllib/engine/@DynamicSystem/mldivide.m    % DynamicSystem method
/MATLAB/toolbox/wavelet/wavelet/@laurpoly/mldivide.m                  % laurpoly method

.

Answer 2

[Voss]

You can loop over the m-files in your folder, call which(_,'-all') on each one, and store information about what which returned:

F = dir('*.m');
for ii = 1:numel(F)
    C = which(F(ii).name,'-all');
    F(ii).instances = C;
    F(ii).is_duplicate = numel(C) > 1;
end

Then the files that have same-name duplicates somewhere on the path are

D = F([F.is_duplicate]);

and their same-name duplicate locations are given by

D.instances

Example:

% create some folders with m-files

% Folder1 contains file1.m and file4.m
mkdir('Folder1')
fid = fopen(fullfile('Folder1','file1.m'),'w'); fclose(fid);
fid = fopen(fullfile('Folder1','file4.m'),'w'); fclose(fid);

% Folder2 contains file1.m and file2.m
mkdir('Folder2')
fid = fopen(fullfile('Folder2','file1.m'),'w'); fclose(fid);
fid = fopen(fullfile('Folder2','file2.m'),'w'); fclose(fid);

% add the folders to the path
addpath('Folder1','Folder2')

% the current folder contains file1.m, file2.m, and file3.m
fid = fopen('file1.m','w'); fclose(fid);
fid = fopen('file2.m','w'); fclose(fid);
fid = fopen('file3.m','w'); fclose(fid);

% run the code above
F = dir('*.m');
for ii = 1:numel(F)
    C = which(F(ii).name,'-all');
    F(ii).instances = C;
    F(ii).is_duplicate = numel(C) > 1;
end

% F contains info about the files in the current folder
F

F = 3x1 struct array with fields:
    name
    folder
    date
    bytes
    isdir
    datenum
    instances
    is_duplicate

F.name

ans = 'file1.m'

ans = 'file2.m'

ans = 'file3.m'

% D contains info about those files that have same-name duplicates
% somewhere on the path
D = F([F.is_duplicate])

D = 2x1 struct array with fields:
    name
    folder
    date
    bytes
    isdir
    datenum
    instances
    is_duplicate

D.name

ans = 'file1.m'

ans = 'file2.m'

% D.instances tells you where the duplicates are
D.instances

ans = 3x1 cell array
    {'/users/mss.system.v6zxt/file1.m'        }
    {'/users/mss.system.v6zxt/Folder1/file1.m'}
    {'/users/mss.system.v6zxt/Folder2/file1.m'}

ans = 2x1 cell array
    {'/users/mss.system.v6zxt/file2.m'        }
    {'/users/mss.system.v6zxt/Folder2/file2.m'}