Use the input arguments to load user-defined .mat files(2xn matrix) in the function.

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Garvit Amipara
Garvit Amipara 2021-4-9
评论： Garvit Amipara 2021-4-11
I am new to matlab
It is necessary to use the input arguments to load different .mat files(2xn matrix) each time the function is used by a user. The number of .mat files to be processed inside the function are also changing, so I used varargout and varargin. For each input, there are 2 output vectors.
As input arguments in varargin can be called by varargin{1}, varargin{2}... I tried to use it to load the files. It did not work.
For example, 2 files that should be executed are Data1.mat, Data2.mat
Outputs will be Ans1,Ans2,Ans3,Ans4.
So I used the following command for the function file (that is saved as Data_function.m)
[Ans1,Ans2,Ans3,Ans4]= Data_function (Data1, Data2)
function varargout = Data(varargin)
A= load ('varargin{1}'); %to load first inputargument file name
Ans1 = A(:,1).*3; %just for example
Ans2 = A(:,2).*4;
B= load ('varargin{2}') %to load first inputargument file name
Ans3 = A(:,1).*3;
Ans4 = A(:,2).*4;
end
This gives an erro: Unable to read file 'varargin{1}'. No such file or directory.
(The files Data1 and Data2 are in the current folder, where the function is saved)
It would be a great help if you could show the right way to load multiple files.

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Walter Roberson
Walter Roberson 2021-4-9
编辑：Walter Roberson 2021-4-9
A= load (varargin{1}); %to load first inputargument file name
This assumes that when you called
[Ans1,Ans2,Ans3,Ans4]= Data_function (Data1, Data2)
that Data1 is a variable containing a character vector or string scalar that contains a file name.
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Walter Roberson
Walter Roberson 2021-4-9
As I understand from your answer, using varargin to input a .mat file is wrong(?)
No, varargin to input a .mat file is fine. Your problem is that when you call
[Ans1,Ans2,Ans3,Ans4]= Data_function (Data1, Data2)
that your Data1 is not a character vector or string scalar at that point in the code.
Garvit Amipara
Garvit Amipara 2021-4-11
Okay, so the right way is to call the function is:
[Ans1,Ans2,Ans3,Ans4]= Data_function ('Data1', 'Data2')
Thank you for your help.

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