Dynamically loading mat files in nested loop

Question

ALZ 2016-7-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/297458-dynamically-loading-mat-files-in-nested-loop

编辑： ALZ 2016-8-5

采纳的回答： ALZ

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Hi, I have several mat files in different directory, the names are organized in the following manner

"Coluomb_Torque_XX_Speed_YY" where XX = 1:29 and YY=1:31;

the problem when I create a nested loop and try to load the files by their full name (including the subdirectories), I get an error regarding the index. I appreciate anyone's help

clear
clc
XX=1:29;
YY=1:31;
for q=1:length(XX)
      for p=1:length(YY)
          ff='Coluomb_';
          tt='Torque_';   %
          uu='_Ratio_';   % 
          qq=num2str(q);
          pp=num2str(p);
          filename=[ff,tt,qq,uu,pp];  
          filename = ['C:\Users\folder1\folder2\folder3\folder4\Data Generating\Coluomb\' filename]
          load(filename)
          %%%%Do your Processing
          %         figure(1)
          %         plot(t,t1)
          %         hold on
          % Clear filename from Workspace
      end
end

The error am getting is :

Error using load
Unable to read file
'C:\Users\folder1\folder2\folder3\folder4\DataGenerating\Coluomb\. No such file or
directory.
Error in post_proc (line 18)
        load(filename)

as you can see, the loop keeps going beyond the index 29, and this happens only when I use the Load command, i.e if I remove the load command I get the filenames exactly as they should be.

Thanks

Alz

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Answer 1

ALZ 2016-7-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/297458-dynamically-loading-mat-files-in-nested-loop#answer_230018

It is solved, I had to include " qq=num2str(q);" in the outer for loop

Thanks

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Answer 2

Walter Roberson 2016-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/297458-dynamically-loading-mat-files-in-nested-loop#answer_230019

Avoid using load() in that form. Instead assign the output of load() to a variable. The result (for a .mat file) will be a structure with one field for each variable stored in the .mat file; you would access the appropriate field of that structure.

When you use load() in the form you have, you might end up loading a new value for one of your other variables. For example there might happen to be a variable named "p" or "YY" in the .mat file and those would overwrite the values you had carefully set. That kind of magic overwriting is not possible if you assign the output of load to a variable.

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ALZ 2016-7-28

you are right Walter, in this code am over writing mat files and the code seems slow for post-processing large data. I'll go with your suggestion. Thanks

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