how to find and mark the value of local minimums in a graph of multiple data ?

Question

reema shrestha 2018-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/382854-how-to-find-and-mark-the-value-of-local-minimums-in-a-graph-of-multiple-data

回答： Chris Turnes 2018-2-15

I have a graph of multiple data taken experimentally. Now I want to find the troughs of the graph. I want to show the value of local minimas in the graph. How do I do it?

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Answer 1

Birdman 2018-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/382854-how-to-find-and-mark-the-value-of-local-minimums-in-a-graph-of-multiple-data#answer_305320

在 MATLAB Online 中打开

Try this:

x=randi([1 7],1,10);
y=randi([3,10],1,10);
plot(x);hold on;plot(y);
[~,idxX]=findpeaks(-x);
[~,idxY]=findpeaks(-y);
plot(idxX,x(idxX),'o');plot(idxY,y(idxY),'o')
hold off;