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

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.

Answer 1

[Walter Roberson]

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.

[Garvit Amipara]

Thank you for such a quick reply!

You are right, using following..

function varargout = Data_function(varargin)
A= load (varargin{1});

gives this error,(as the (2xn).mat matrix contains real numbers)

Error using load
Must be a string scalar or character vector.

Error in Data_function (line 4)
 A= load (Data1);

sorry for not mentioning the data type before. The .mat files I am trying to import are all '2 x n'matrices which contains 'real numbers'(they are x,y values of different curves).

As I understand from your answer, using varargin to input a .mat file is wrong(?)

Could you please show the right way to feed and read user specific amount of .mat files containing 2xn matrix, thorugh the function? This helps a lot, thank you in advance!

[Walter Roberson]

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]

Okay, so the right way is to call the function is:

[Ans1,Ans2,Ans3,Ans4]= Data_function ('Data1', 'Data2') 

Thank you for your help.