MATLAB code for determining peak frequencies
| function [peak,dist] = peakdetect(A, B, binsize) %% PEAKDETECT help % % Determines the peak value of a distribution. % % INPUTS: % A: x values of distribution. % B: distribution values. % binsize: Number of points to be included in a bin. % OUTPUTS: % peak: center of bin with the maximum distribution value. % dist: highest average distribution value for a bin. % % EXAMPLE: % A = (x values go here) % B = (distribution values go here) % binsize = 10 % [peak, dist] = peakdetect(A,B,binsize); % %% PEAKDETECT %The number of points to extend forward or backward %Step size of the distribution dx = A(2)-A(1); %Initialize integral array integral = zeros(length(B)-binsize+1,1); %Calculate the integrals for i = 1:length(B)- binsize + 1 %Take the sum of the x values multiplied by y values in the bin integral(i) = sum(dx×B(i:i+binsize-1)); end %Find the index of the center of the bin with the max integral j = find(integral==max(integral))+round(binsize/2); %Find the value of the max integral peak = A(j); %Return the average dist around the max distribution value dist = mean(B(j-round(binsize/2):j+round(binsize/2))); end |