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Re: How to find global and local maxima using octave and its position
From: |
Ben Abbott |
Subject: |
Re: How to find global and local maxima using octave and its position |
Date: |
Mon, 17 Oct 2011 09:55:07 -0400 |
On Oct 17, 2011, at 9:15 AM, preeti gaikwad wrote:
> Hello all,
>
> If I have x and f(x) I want to find out the maxima of f(x) and
> position of the same so for that if I write the syntax like "max(f(x))" I
> will get it but how to get its position means the corresponding x value????
>
> Now suppose I have 'n' value of x and f(x), and there I have three peaks in
> the f(x) where one peak is the "reference peak" where I want to find (its
> position and amplitude, width) and fit with the Gaussian function, second
> peak coming from the actual sample. and the third is the unwanted peak in the
> sample (called the noise).
>
> using octave I want to get rid of this noise peak where I know want to know
> the width and the position to remove this
>
> 1. If I say max(f(x)) then I get only one peak at but how to write syntax for
> getting position??? I already knew the width of this pulse but how to find
> the width of the noise pulse????
> 2. how to find second peak its position and width?
> thanks a lot in advance for solving my problem........
You just need the second output of the max() function.
[max_value, index_of_max_value] = max (f (x));
See "help max" for more info.
You can also do ...
index_of_max_value = find (f(x) == max(f(x)));
Ben
- How to find global and local maxima using octave and its position, preeti gaikwad, 2011/10/17
- Re: How to find global and local maxima using octave and its position,
Ben Abbott <=
- Re: How to find global and local maxima using octave and its position, preeti gaikwad, 2011/10/17
- Re: How to find global and local maxima using octave and its position, Ben Abbott, 2011/10/17
- Re: How to find global and local maxima using octave and its position, preeti gaikwad, 2011/10/17
- Re: How to find global and local maxima using octave and its position, Ben Abbott, 2011/10/17
- RE: How to find global and local maxima using octave and its position, William Krekeler, 2011/10/17
- Re: How to find global and local maxima using octave and its position, preeti gaikwad, 2011/10/18