Loop through files of different length

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Emu 2022-10-6

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评论： dpb 2022-10-6

I am trying to loop through some data files of differing length, but at the moment I have to set the length manually for each file, so my code keeps breaking:

hrsInf(1,1) = sum(ECGdata(1:h,1)==0)/h*100;
hrsInf(2,1) = sum(ECGdata(h+1:2*h,1)==0)/h*100;
hrsInf(3,1) = sum(ECGdata(2*h+1:3*h,1)==0)/h*100;
hrsInf(4,1) = sum(ECGdata(3*h+1:4*h,1)==0)/h*100;
hrsInf(5,1) = sum(ECGdata(4*h+1:5*h,1)==0)/h*100;
hrsInf(6,1) = sum(ECGdata(5*h+1:6*h,1)==0)/h*100;

and so on, where h is one hour (with a 250psec sampling rate). How can I loop through each file to the maximum number of whole hours?

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Answer 1

dpb 2022-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/1819120-loop-through-files-of-different-length#answer_1068355

在 MATLAB Online 中打开

When you compute what h is in samples (if sample rate varies, otherwise just set it as a constant), then

[R,C]=size(ECGdata);
N=fix(R/h);
tmp=reshape(ECGdata(1:N*h,1),h,[]);
hrsInf=sum(tmp==0)/h*100;

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Emu 2022-10-6

oh my goodness thank you so much !!

dpb 2022-10-6

Yeah, taking advantage of knowledge of storage order and that most MATLAB functions operate by default by column can save a lot of gyrations otherwise...

Another way to do stuff similar to this if have Image TB is blockproc

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