How to process multiple dot mat file using for loop

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Yared Daniel 2021-5-24

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评论： Yared Daniel 2021-5-24

Hello every one, please help me in solving this issue

I have thousands of mat files as shown in figure for sample. Each mat file contains a variable called ‘val’ which is 2 by 19000 matrices. What I need is to extract the first raw of ‘val’ of each dot mat file and save it by naming sequentially like “x1, x2, x3……..” Using for loop.

I have done for a single file successfully by the following algorithm

>> clear all

>> load('dist (1).mat')

>> x = val(1,:);

>> save('x1.mat', 'x')

I have attached some of the dot mat files

Thanks so much in advance for your help

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回答（1 个）

David Fletcher 2021-5-24

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Wouldn't it be better to extract what you want into a single matrix and then just save the one matrix with all the data rather than having thousands of separate files? Having said that, a basic framework for doing what you want is:

clear
numberOfFiles= %enter number of files;
for iter=1:numberOfFiles
    fName=sprintf('dist (%d).mat',iter);
    x=load(fName);
    x=x.val(1,:);
    fName=sprintf('x%d.mat',iter);
    save(fName, 'x');
end

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David Fletcher 2021-5-24

在 MATLAB Online 中打开

clear
numberOfFiles= %enter number of files;
for iter=1:numberOfFiles
    fName=sprintf('dist (%d).mat',iter);
    x=load(fName);
    allData{iter}=x.val(1,:)
end
save('data.mat', 'allData.mat')