How make a loop that finds my selected specific peaks and plots them on the graph

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Tucker Stone
Tucker Stone 2019-11-7
评论： Star Strider 2019-11-7
I could manually go through and find these positive and negative peaks but I want to write a loop that will plot them.
Below is a picture of the data with the peaks that I want labeled.
Not sure how to go about this, maybe list constraints for minimums and maximum values to eliminate other peaks and use the findpeaks function.
*Edit attempt at writing the loop but it is having problems with the bolded sections.
load('x&avdata.mat');
plot(lefttoeavy);
for x=0:2042
if y>3 && y<4.5
findpeaks(lefttoeavy)
elseif y>-3 && y<-4.5
findpeaks(-1*(lefttoeavy))
end
end
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Star Strider
Star Strider 2019-11-7
The findpeaks function is easier to work with when its outputs are returned to the calling function workspace.

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回答（1 个）

Star Strider
Star Strider 2019-11-7
The findpeaks function has several name-value pair arguments that can help you do what you want, including defining them by prominence. To find the ‘negative peaks’, multiply your signal by -1 to use findpeaks to determine them.
Other options are islocalmax and islocalmin, both introduced in R2017b.

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