Create a function which returns values into input variables in a single call.

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bbb_bbb 2018-5-3

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关闭： MATLAB Answer Bot 2021-8-20

For example, given a function:

function str=addslash(str) % add slash to a directory name
   if str(end)~='\', str(end+1)='\'; end
end

Then I call it for a couple of directories:

dir1=addslash(dir1);
dir2=addslash(dir2);
dir3=addslash(dir3);
...

How to rearrange the function, in order to call it with one statement like this (number of input arguments may vary):

addslash(dir1, dir2, dir3, ...);

or like this:

addslash('dir1', 'dir2', 'dir3', ...); % dir1, dir2, dir3... are names of variables

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bbb_bbb 2018-5-3

i.e. strcmp(dir1,dir2);

Stephen23 2018-5-3

If you just want to compare the paths, then removing the trailing file separator character would be simpler. See my answer.

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Answer 1

KSSV 2018-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/398758-create-a-function-which-returns-values-into-input-variables-in-a-single-call#answer_318393

在 MATLAB Online 中打开

function nargin=addslash(varargin) % add slash to a directory name
N = length(varargin) ;
nargin = cell(N,1) ;
for i = 1:N
    str = varargin{i} ;
    if str(end)~='\'
        str(end+1)='\'; 
    end
    nargin{i} = str ;
end

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bbb_bbb 2018-5-3

编辑：bbb_bbb 2018-5-3

The problem is, how to write the results back to the input variables?

Guillaume 2018-5-3

@KSSV, that nargin should be varargout.

@bbb_bbb, The problem is, how to write the results back to the input variables?

If you need to do that, you've gone wrong in the design of your code. Clearly, since you want to apply the same code to multiple variables that means that these variables are related in some way. Therefore, you shouldn't have multiple variables but just one variable that holds the content of all these variables, an array, cell array, whatever container you want. the problem then goes away, just loop over the content of that container.

A very simple rule: If you number variables, stop, you're doing it wrong.

Stephen had a very valid point in the last part of his comment

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 2

Stephen23 2018-5-3

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编辑：Stephen23 2018-5-3

在 MATLAB Online 中打开

This will work on one single string or char vector, or on a cell array of them:

C = strcat(regexprep(C,'\\$',''),'\')

You can easily define a function handle for it:

addslash = @(C) strcat(regexprep(C,'\\$',''),'\');

Which makes calling it trivial:

>> addslash('hello')
ans = hello\
>> addslash('world\')
ans = world\
>> C = addslash({'ab','cd\','ef\gh'});
>> C{:}
ans = ab\
ans = cd\
ans = ef\gh\

EDIT: For your usecase, it would be simpler to remove the trailing slash:

strcmpi(regexprep(A,'\\$',''),regexprep(B,'\\$',''))

Create a function which returns values into input variables in a single call.

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