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Re: what is the highest subscript in the array?!? [message #70849 is a reply to message #70774]

Fri, 07 May 2010 12:05

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On May 7, 3:46 pm, munka <mynameismu...@gmail.com> wrote:
>> On May 7, 6:20 am, wlandsman <wlands...@gmail.com> wrote:
>> Sorry, that should be
>
>> dum = max(flux[1:N_elements(flux)-2], c) & index = c+1
>
> That still does not return the LOCAL maximum. If the max is on the
> edge, it will still return a value
>
> IDL> flux=findgen(10)
> IDL> print,flux
> 0.00000 1.00000 2.00000 3.00000 4.00000
> 5.00000
> 6.00000 7.00000 8.00000 9.00000
> IDL> print,max(flux)
> 9.00000
> IDL> print,max(flux[1:N_elements(flux)-2], c)
> 8.00000
> IDL> print,c+1
> 8

Could do something like

nflux=n_elements(flux)
local_maxima=where((flux[1:nflux-2] ge flux[2:nflux-1]) and
(flux[1:nflux-2] ge flux[0:nflux-3]))+1

That would give the indexes of all points that are local maxima,
defined as those larger than or equal to their immediate neighbors.
Then max() or histogram() may be used to pick the highest maxima,
depending on what is wanted.

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[Message index]

		what is the highest subscript in the array?!? By: munka on Thu, 06 May 2010 19:12
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 19:09
		Re: what is the highest subscript in the array?!? By: penteado on Fri, 07 May 2010 12:05
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 11:51
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 11:46
		Re: what is the highest subscript in the array?!? By: eddie on Fri, 07 May 2010 08:37
		Re: what is the highest subscript in the array?!? By: wlandsman on Fri, 07 May 2010 03:35
		Re: what is the highest subscript in the array?!? By: wlandsman on Fri, 07 May 2010 03:20
		Re: what is the highest subscript in the array?!? By: Carsten Lechte on Fri, 07 May 2010 02:34
		Re: what is the highest subscript in the array?!? By: R.G.Stockwell on Thu, 06 May 2010 22:39
		Re: what is the highest subscript in the array?!? By: Giuseppe Papa on Sat, 15 October 2011 11:57

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