Definite sum in MATLAB

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Mona7150

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Hello all,

I have a parameter in frequency domain say x(f) calculated for 0 to 100GHz but I want to sum up the x's from 50 to 60 GHz only. How should I write this in MATLAB?
 

Hallo,

if f is the frequency array and X(f) your signal

startFreqIdx = find(X >= F_0, 1 ); % the first index of X(f) with frequency f>= F_0
stopFreqIdx = find(X <= F_1, 1, 'last' ); % the last index of X(f) with frequency f<= F_1

S = sum(X(startFreqIdx : stopFreqIdx ))

This should work (precondition: f axes has been assumed in increasing order)

Mowgli
 
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