how to extract the time interval where variables start to increase

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bay rem 2016-2-27

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回答： Image Analyst 2016-2-28

i have a function and i plot for every moment results of this function, such the image indicate, ,and then i want to detect the moment where variables start to increase and stop increasing

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Answer 1

Image Analyst 2016-2-28

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在 MATLAB Online 中打开

Try this:

indexes = find(signal < -50);

That will tell you whenever an signal value is less than -200. If you want to find only stretches where it meets the condition for some minimum number of elements, you can use bwareaopen() to throw out short stretches.