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find local minima within a time window of interest

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Melissa Jones
Melissa Jones 2021-11-11
回答： Star Strider 2021-11-11
To do the plot I have the X values and the Y values.
I need to find the local minima within a specific time-window (250-350) in the x axes.
How can I do it?

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采纳的回答

Star Strider
Star Strider 2021-11-11
To find the minimum using findpeaks, multiply the first argument (‘y’) by -1 so the minimum becomes a maximum. Do not use the second argument as ‘x’ so that ‘locs’ returns an index. Then, use the ‘locs’ output with the original ‘x’ and ‘y’ vectors to get those values.
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Yongjian Feng
Yongjian Feng 2021-11-11
You first need to figure out idx range of X for 250-350. Called them idx_start and idx_end.
Then just
min(Y(idx_start:idx_end))
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Yongjian Feng
Yongjian Feng 2021-11-11
编辑：Yongjian Feng 2021-11-11
Try this:
idx_start = find(X>=250, 1);
idx_end = find(X>=350, 1);
Adjust the condition above whether you want X>= or just X>.
Melissa Jones
Melissa Jones 2021-11-11
Thank you Yongjian, but i need to use the find_peaks function

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