Mark 1D-array in a 2D-plot

Question

I have a noisy periodic signal in Matlab that I've extracted peaks from with the help of [peak loc]=findpeaks(signal). However unrealistic outliers are also inside the peak array. I set min- and max-values for peak and so get a shorter peak array. Now I would love to mark this shorter subset of original peak into the original plot(loc,peak), whereat I'd get an error, since loc has kept its original length.

My questions:

Is there a way in the fashion of a container.map or something similar that allows to adapt loc to peak with consistence of the loc-peak assignments?
- How can I alternatively plot the shortened peak array onto the original signal plot?

Thanks a lot!

score 2 · Accepted Answer · answered Dec 15 '16 at 00:28

2

I think you can solve your problem with following code:

[peak,loc] = findpeaks(signal);
max_thr = 2;
min_thr = 1e-5;    
mask = peak>min_thr&peak<max_thr;
plot(loc(mask),peak(mask))

Is this what you want ?

answered Dec 15 '16 at 00:28

toygan kılıç

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4
16

Wow thanks, didn't know of that masking idea! Tesekkürler! – Aliakbar Ahmadi Dec 15 '16 at 08:02
How can I read further on this idea? Is there a term for this technique? – Aliakbar Ahmadi Dec 15 '16 at 08:13
1

Rica ederim :) Actually it is very common approach to use mask idea in MATLAB. I recommend you to read http://stackoverflow.com/questions/32379805/linear-indexing-logical-indexing-and-all-that this site for further information about indexing. – toygan kılıç Dec 15 '16 at 08:47

Mark 1D-array in a 2D-plot

1 Answers1