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How can I increase the speed of this loop?

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Ash Ahamed
Ash Ahamed on 18 Oct 2019
Commented: Ash Ahamed on 18 Oct 2019
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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Accepted Answer

Jeremy Hughes
Jeremy Hughes on 18 Oct 2019
Edited: Jeremy Hughes on 18 Oct 2019
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

  3 Comments

Ash Ahamed
Ash Ahamed on 18 Oct 2019
Thanks! I wll try this out. n was a typo.
Jeremy Hughes
Jeremy Hughes on 18 Oct 2019
I also made a typo... My "n" in the sprintf line should be "K"
Ash Ahamed
Ash Ahamed on 18 Oct 2019
Saw that! haha thanks and it worked!!

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