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Re: Odd behaviour in array indexing ? [message #34179]

Fri, 21 February 2003 09:29

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

"mwvogel" <mvogel@rdiag.fgg.eur.nl> wrote in message
news:b35fla$q50$2@mrelay2.eur.nl...
> Today I realized something is amiss in IDL
> When I do
> index = [1,0,2,3,1,2,3,4]
> m = FLTARR(8)
> d = FINDGEN(8)
> m[index] = d
> print, m
> 1.00000 4.00000 5.00000 6.00000 7.00000
> 0.000000 0.000000 0.000000
>
> Now I would have assumed that IDL would automatically *add* the numbers
with
> identical indices. Not doing so is a potential performance penaly, right ?
Or am I mistaken....

This subject is discussed in the "Vectorization question" thread associated
with my name at Google Groups:

http://groups.google.com/groups?group=comp.lang.idl-pvwave

Cheers,
Liam Gumley.
Practical IDL Programming
http://www.gumley.com/

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[Message index]

		Re: Odd behaviour in array indexing ? By: Liam E. Gumley on Fri, 21 February 2003 09:29
		Re: Odd behaviour in array indexing ? By: James Kuyper on Fri, 21 February 2003 07:48
		Re: Odd behaviour in array indexing ? By: tam on Fri, 21 February 2003 07:53
		Re: Odd behaviour in array indexing ? By: David Fanning on Fri, 21 February 2003 07:40

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