REad about findpeaks
how to find the bottom peaks in the graph?
19 views (last 30 days)
Show older comments
how to find decreasing order of peaks in graphs, so that how much graphs goes deeper at higher frequencies (plz refer image.).i have to find the values so that my graph reaches as deeper as possible at higher frequency.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/134382/mat.jpg)
3 Comments
Accepted Answer
madhan ravi
on 1 Oct 2018
Edited: madhan ravi
on 3 Oct 2018
[locs,idxs]=findpeaks(-y) %EDITED
If y is the function of the plot -y will give the minimum of the function.
2 Comments
More Answers (2)
Image Analyst
on 3 Oct 2018
Find valleys by sending the inverted vector into findpeaks() and finding the peaks. Then you have to invert again to get the positive values (since you have inverted/negated it):
% Find values and locations:
[negPeakValues, indexesOfValleys] = findpeaks(-signal);
% Invert values to get the original, non-inverted values.
valleyValues = -negPeakValues;
0 Comments
Jim Riggs
on 3 Oct 2018
Here is a similar problem. To find the bottom peaks, just change one line from
if(D(i) >0 && D(i+1)<0
to
if(D(i)<0 && D(i+1)>0
0 Comments
See Also
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!