Knowing the presence of a peak around a point

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How to know wheather a peak is present around a ponint 'x0' in a 1d plot.
Clearly saying I want to know wheather a peak is present in the space 'x0-d' to 'x0+d' where d is a variable representing the distance from the point x0
Vinay Killamsetty
Vinay Killamsetty on 30 May 2021
Hi, Walter.
I want to chek whether the Maximum peak of the plot is in the defined range.

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Accepted Answer

Walter Roberson
Walter Roberson on 30 May 2021
Assuming you have a vector of x values (rather than x0 being an index), and that your signal is called y:
acceptable_idx = find(abs(x-x0)<=d);
[~, peakidx] = max(y);
if ismember(peakidx, acceptable_idx)
%yes, peak is inside the desired interval

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