MATLAB: How to use loop function to find the 1st to Nth elements’ average, and then 2nd to Nth element’s average? Thanks

averagefor loopwhile loop

Hi guys thanks for helping me. Suppose i have 700 data in a column, and i want to find out the first 120 elements' average. Then starting from this point, i want to find out the average of the sum of from 121st to the 700th, then from 122nd to 700th and so on. I know i have to use iteration to solve this, but i fail to set up a good algorithm and required syntax.

I am beginner of Matlab, please help me, thank you !!

Best Answer

Navg=120;                         % number for moving average
krnl=ones(N,1)/N;                 % convolution kernel over N elements
xfilt=conv(x, krnl, 'valid')      % filtered mean result over valid elements

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Yes, of course it can. Just pick one that is meaningful for what you want to discover about the image. Which one you pick depends on what you want to find out about the image. Maybe it's the mean, or maybe it's the average blob diameter, or maybe it's the area fraction or standard deviation or whatever. What do you think you might want to measure? Can you attach and image and explain what things are in it and what you want to measure?

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data - your array [42x16384]

EDIT

out = mean(reshape(data,size(data,1),[],8),3);

eg:

data - your array [55x72000]

out = mean(reshape(data,size(data,1),[],3),3);

out = squeeze(mean(reshape(data,size(data,1),3,[]),2)) ;

Best Answer

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