Finding minimum and maximum in many txt samples.

Question

Jonasz 2013-8-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84130-finding-minimum-and-maximum-in-many-txt-samples

I would like to find min and max in samples which I load from my directory to Matlab. I need to speed up it a little bit and try avoid eg. loops . Is there any easy way how to find min and max in many samples without using 'for' loop? How to read txt files no one by one in a loop but all at once?

Part of my code:

   list=dir('*.txt');
   for i=1:length(list)
   fid=fopen(list(i,1).name);
   text_1=cell2mat(textscan(fid,'%f %f'))';
   end
   fclose(fid);

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Matt Kindig 2013-8-6

编辑：Matt Kindig 2013-8-6

在 MATLAB Online 中打开

One thing that might help is to move the fclose(fid) statement inside the for loop. As it stands now, you are only closing the last file after all *.txt files have been processed. This means that Matlab has to keep each of those file handles open during the loop, which takes up I/O resources.

In other words:

list=dir('*.txt');
for i=1:length(list)
   fid=fopen(list(i,1).name);
   text_1 = textscan(fid, '%f %f', 'CollectOutput', true));
   text_1 = text_1{1};  %this might be a bit faster as well
   fclose(fid);   
end