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Re: fastest way to find the first non-zero value in an array [message #59678 is a reply to message #59675]

Tue, 08 April 2008 01:42

Clemens
Messages: 1
Registered: April 2008

Junior Member

it depends on the size of array. Small array is a simple loop.
Huge one can be :

index_arr = where( arr NE 0)
print, index_arr[0]

on very huge arrays you can devide arr into big peaces.

Clemens

<smasson@locean-ipsl.upmc.fr> schrieb im Newsbeitrag
news:ff3bf651-8707-47e8-8cff-5e694dd5622f@m71g2000hse.google groups.com...
> Hi,
>
> I want to find the first non-zero value of an array. Is there a faster
> way to do this than with the "where" command: (where(array ne 0))[0]
> "Where" will look for all non-zero values and I only need the first
> one. It would be great if I could stop "where" in its search process
> as soon as it found one element...
>
> sebastien

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[Message index]

		Re: fastest way to find the first non-zero value in an array By: Vince Hradil on Tue, 08 April 2008 07:02
		Re: fastest way to find the first non-zero value in an array By: Spon on Tue, 08 April 2008 06:56
		Re: fastest way to find the first non-zero value in an array By: David Fanning on Tue, 08 April 2008 06:34
		Re: fastest way to find the first non-zero value in an array By: Vince Hradil on Tue, 08 April 2008 06:15
		Re: fastest way to find the first non-zero value in an array By: Spon on Tue, 08 April 2008 06:03
		Re: fastest way to find the first non-zero value in an array By: Clemens on Tue, 08 April 2008 01:42
		Re: fastest way to find the first non-zero value in an array By: karo03de on Wed, 09 April 2008 13:02

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