Finding nearest local max. and min. of a polynomial function

Hi everyone,

I have a fitted high order single variable polynomial function (ex. amp vs. time). At a specific point of interest (or time), the amp deceases as time get bigger and increases as time gets smaller. How do I find the nearest local max. (or the point where the amp stop increasing) and local min. (or the point where the amp stop deceasing) around that point of interest?

Below is what I have so far...

% p is my polynomial coefficients

syms x

sc=poly2sym(p,x);

poly = matlabFunction(sc)

fminbnd(poly,a,b) % for finding min. Don't know how to find max. yet

The problem is I don't really know the boundary [a,b]. If I set the boundary to big, there might be other max. and min., but I just want the nearest max. and min. around the point of interest.

Any idea?

thanks!

Answer 1

[Azzi Abdelmalek]

you can use findpeaks function