How can I increase the speed of this loop?

Question

Ash Ahamed 2019-10-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/486182-how-can-i-increase-the-speed-of-this-loop

评论： Ash Ahamed 2019-10-18

This loop takes a long time to finish. Is there anyway I can increase the speed? Thanks

for n=0:5039
name = sprintf('%d/conformability.txt', n)
fid = fopen(name) ;
data = textscan(fid,'%f32','HeaderLines',1) ;
data = cell2mat(data)
n = length(data)
data = reshape(data,[10,n/10])
data = transpose(data)
fclose(fid);
comformability(:,n)=data(:,2)
data = []
end

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Answer 1

Jeremy Hughes 2019-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/486182-how-can-i-increase-the-speed-of-this-loop#answer_397072

编辑：Jeremy Hughes 2019-10-18

在 MATLAB Online 中打开

It's hard to say without looking at the contents of the file's you're reading.

You're overriding n in the for loop with n as the length of the data. Is that a typo?

% With some assumption about the file you're reading...
fmt = repmat({'%*f32'},1,10);
fmt{2} = '%f32';
fmt = [fmt{:}];
for K=0:5039
    name = sprintf('%d/conformability.txt', K);
    
    fid = fopen(name);
    data = textscan(fid,fmt,'HeaderLines',1);
    fclose(fid);
    comformability(:,K+1)=data{1}; % if K == 0 this would error.
end