MATLAB: Find X of corresponding local minima

Question

I have Fx values (ie Y) and corresponding T values (X). To findout the local minima, i have used following prog. [Maxima,MaxIdx] = findpeaks(Fx); FxInv = 1.01*max(Fx) – Fx; [c,MinIdx] = findpeaks(FxInv); Minima = Fx(MinIdx); a= Minima(Minima >100); % further find out values of peak of Fx more than 100.

How I can find T values(X), corresponding to a? i tried b=T(a) but it doesn't work

Answer 1

Finding minima of a signal X is the same as finding the maxima of the signal -X