MATLAB finding local maximum in certain range

This is my time domain signal

Area enclosed in black rectangle is my area of interest

I successfully identified a minimum point;

however, I'm struggling to identify the local maximum point enclosed in this area..

I'm trying to write a code that says:

1. identify the global minimum point

2. identify the local maximum point that comes before the global minimum point

I have no idea how to write #2..

Please help!

Answer 1

[Image Analyst]

Try this:

% Find global min
[minValue, indexOfMin] = min(signal)
% Specify where the window begins
startIndex = index - windowWidth;
% Find max
[maxValue, indexOfMax] = max(signal(startIndex:indexOfMin))
% Add offset to index
indexOfMax = indexOfMax + startIndex - 1;