MATLAB: How can i display a list of maximum of a curve

Question

Hi

I have a curve Amplitude=f(frequency) and i want to know the abscissa of all maximums.

Please help me.

Answer 1

Try looking up the findpeaks() function.

https://www.mathworks.com/help/signal/ug/find-peaks-in-data.html

Seems to take in a curve and find the peaks and output the location of those 'n' # of peaks.

your code should look something like this:

________________________________________

frequency = some matrix of frequencies;

Amplitude=f(frequency);

[pks, locs] = findpeaks(Amplitude);

%if you want to see it is true

plot(frequency,Amplitude,frequency(locs),pks)

________________________________________________

Your abscissa's that you are looking for would be essentially frequency(locs), where locs is the index number in the matrix 'frequency' that contains your independent variable (called frequency or x or abscissa) corresponding to your peaks.

Let me know if you have any questions.