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Re: Help: how to do ? [message #15278 is a reply to message #15269]

Tue, 04 May 1999 00:00

Pavel Romashkin
Messages: 166
Registered: April 1999

Senior Member

Hi Tri,
Now I tested it better. Try the following:

pro test, N

start=systime(1)
a1=findgen(1,3)
a2=findgen(N, 3)
a3=a2
for i=0,N-1 do a3[i, *] = a2[i, *]+a1
print, systime(1) - start
print, a3

start=systime(1)
a1 = fix(findgen(N*3)/N)
a2 = findgen(N*3)
a3 = reform((a2+a1), N, 3)
print, systime(1) - start
print, a3
end

Still is faster by a factor of 10.
Cheers,
Pavel

Tri VU KHAC wrote:

> Having 2 arrays:
> + 3x1 : A1 = findgen(1, 3)
> + 3xN: A2= findgen(N, 3)
>
> No I need to do sth like:
>
> for i=1, N do A[i,*] = A2[i,*] + A1
>
> How to avoid FOR-DO here ?

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[Message index]

		Re: Help: how to do ? By: eddie haskell on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: Pavel Romashkin on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: VU KHAC Tri on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: Robert S. Hill on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: Pavel Romashkin on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: Pavel Romashkin on Tue, 04 May 1999 00:00
		Re: Help: how to do ? By: Pavel Romashkin on Tue, 04 May 1999 00:00

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