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Re: Speedy way to get compare array elements. . . [message #33099 is a reply to message #33031]

Tue, 03 December 2002 22:54

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

trouble wrote:
> Craig Markwardt <craigmnet@cow.physics.wisc.edu> wrote in message news:<on4raklqpk.fsf@cow.physics.wisc.edu>...
>
>> ...The cool thing about the trick is that IDL *automatically* truncates
>> the vector A so that it matches the length of A[1:*].
>>
>
>
> Ah, but is there any way to not make it do that? Say you have 2
> vectors of different lengths:
>
> x = findgen(50)
> y = findgen(100)
>
> and you want to form z = x * y, but have z the same length as y
> putting zeros where x has no value. The (sorry) way I am doing it is
>
> z = y * 0
> z[0:49] = x * y
>
> which clearly is too much programmer work since I have to get the
> lengths... Any ideas?
>
> Ciao.

I got the impression my news-server is a little slow,
but anyway (as I see no reply so far):

just say:

z[0]=x*y

IDL the copies as many values as there are to z[0] and the
following elements.

marc

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[Message index]

		Re: Speedy way to get compare array elements. . . By: Pavel A. Romashkin on Thu, 14 November 2002 08:51
		Re: Speedy way to get compare array elements. . . By: Craig Markwardt on Wed, 13 November 2002 20:28
		Re: Speedy way to get compare array elements. . . By: the_cacc on Thu, 28 November 2002 06:58
		Re: Speedy way to get compare array elements. . . By: marc schellens[1] on Tue, 03 December 2002 22:54

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