I am trying to find the maximum and minimum values from a given set of data.

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Prateek Srivastava 2017-10-7

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评论： Image Analyst 2017-12-21

when I am using findpeaks command in Matlab I am only getting the peak value I also want the minimum value could you suggest which command I can use.I am also attaching the data file which includes one column of time and one column of stress signals.I have also attach the Matlab file,please find the attachment

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Pedro Galvez 2017-10-7

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Hello!

Maybe you can first import the data into a vector and then look for the maximum and minimum like this:

A=importdata('sl.txt');
B=A.data;
mx=max(B(:,2))
mn=min(B(:,2))

This code should work!

Pedro

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Prateek Srivastava 2017-10-7

But the idea is to find all the max and min peaks that is the points.

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Image Analyst 2017-10-7

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To find the "valleys", simply invert the signal

[peakHeights, indexesOfPeaks] = findpeaks(stress);
[valleyHeights, indexesOfValleys] = findpeaks(-stress);  % Note the minus sign!
valleyHeights = abs(valleyHeights); % Correct for inverting it.

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Prateek Srivastava 2017-12-21

yeah I got your point that load is a function that takes file name string so what can I use to copy the ith element of the array "load" to the variable s1?