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Re: array manipulation problem [message #20369 is a reply to message #20365]

Wed, 07 June 2000 00:00

Benno Puetz
Messages: 16
Registered: March 2000

Junior Member

"Martin B. Schmidt" wrote:

> Hi,
>
> Given:
>
> n=500
> a=FltArr(n,n,n)
>
> How can I assign
> a[i,j,k] = i^2+j^2+k^2 for all i,j,k (i,j,k=0,1,2,..,n-1)
> without using any loop?
>
> Any idea?
>
> Martin

n=500

i = REBIN(REFORM(FINDGEN(n),n,1,1),n,n,n)^2 ; x^2

a = i + $ ; x^2

TRANSPOSE(i,[1,0,2]) + $ ; y^2

TRANSPOSE(i,[0,2,1]) ; z^2

should work if you have enough memory( I only tried n=5, though, since
this allocates two large arrays, not counting temporary allocations)

--
Benno Puetz
Kernspintomographie
Max-Planck-Institut f. Psychiatrie Tel.: +49-89-30622-413
Kraepelinstr. 10 Fax : +49-89-30622-520
80804 Muenchen, Germany

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[Message index]

		Re: array manipulation problem By: Benno Puetz on Wed, 07 June 2000 00:00
		Re: array manipulation problem By: Paul Hick on Wed, 07 June 2000 00:00
		Re: array manipulation problem By: Benno Puetz on Wed, 07 June 2000 00:00

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