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Re: Array definition [message #55271]

Wed, 08 August 2007 10:53

Bob[3]
Messages: 60
Registered: December 2006

Member

On Aug 8, 1:38 pm, Conor <cmanc...@gmail.com> wrote:
> On Aug 8, 1:18 pm, Yaswant Pradhan <Yaswant.Prad...@gmail.com> wrote:
>> avoid FOR loop, use WHERE
>> indices = where(array GT value, n_wh)
>
> specifically:
>
> array_size = size(array1, /dimensions)
> array2 = fltarr(array_size)
> w = where( array1 gt value, c )
> if c gt 0 then array2[w] = array1[w]

w will be an array of the indices, sized to the number of elements of
array1 gt value (given by c), which is what Melanie was looking for
afaict.
array2 will be the same size as array1, but will have masked out any
elements le value. (mask should be 0.0).

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[Message index]

		Re: Array definition By: Bob[3] on Wed, 08 August 2007 10:53
		Re: Array definition By: Conor on Wed, 08 August 2007 10:38
		Re: Array definition By: yp on Wed, 08 August 2007 10:18
		Re: Array definition By: Bob[3] on Wed, 08 August 2007 10:15

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