Reading file name in a loop.

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Hi,

I've a Matlab-File for a specific calculation which is placed in a Folder 'A'.

Folder 'A' contains seven more Folder 'B1,B2,...,B7' with different variants. Each folder 'B1,...,B7' contains 45 excell files.

Actually I'm loading a specific excell file with this code:

addpath B1
filename = 'VAR2_D302_N100000_BP5.xlsx'
num = xlsread(filename);

and have to change every time the addpath name if I want to jump in another folder or the filename if I want to select another excell fle.

Is there any other way to do this. I mean how can I automatize this process?

I was thinking of a loop which selects the folder and excell file in need by specifying variables which output the name of my files.

   % Example with two files in a Folder 'B1'
   % VAR2_D302_N100000_BP5.xlsx
   % VAR2_D302_N100000_BP6.xlsx
     X=2;
     for i=1:X 
        addpath B1
        filename = 'VAR2_D302_N100000_BPX.xlsx'  % This will not work. How can I tell matlab that the 'i' is changing?
     end 
   num = xlsread(filename);