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Re: fastest way to find the first non-zero value in an array [message #59814 is a reply to message #59678]

Wed, 09 April 2008 13:02

karo03de
Messages: 21
Registered: March 2007

Junior Member

On 8 Apr., 10:42, "Clemens" <yy...@hotmail.com> wrote:
> 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
>
> <smas...@locean-ipsl.upmc.fr> schrieb im Newsbeitragnews:ff3bf651-8707-47e8-8cff-5e694dd5622f@m71g200 0hse.googlegroups.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

What about the system function ARRAY_EQUAL ?
Karsten

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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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