MATLAB: Find Peaks in an FFT without Signal Processing Toolbox

MATLAB

I have an FFT and I would like to find the peaks but I do not have the Signal Processing Toolbox. I know the 'findpeaks' function does what I want but is there a way to achieve this without the toolbox? 

Best Answer

While this may not yield the exact same functionality as 'findpeaks', a new function introduced in R2017b 'islocalmax' should have similar functionality. 
https://www.mathworks.com/help/matlab/ref/islocalmax.html
If you take a look at the example below, I have provided some code below that is identical to the first part of the example using 'islocalmax': 
https://www.mathworks.com/help/signal/ref/findpeaks.html#bufhyo1-1
load sunspot.dat
year = sunspot(:,1);
avSpots = sunspot(:,2);
m = islocalmax(avSpots);
plot(year,avSpots);
hold on;
plot(year(m), avSpots(m), '*');
'islocalmax' does not have the exact functionality as 'findpeaks' but should suffice in some use cases. 
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