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Re: Oh No... [message #53586 is a reply to message #53505]

Wed, 18 April 2007 12:21

Carsten Lechte
Messages: 124
Registered: August 2006

Senior Member

Fďż˝LDY Lajos wrote:
> IDL> a[(a=2*findgen(10))]=1 & print, a
> 1.00000 2.00000 1.00000 6.00000 1.00000
> 10.0000 1.00000 14.0000 1.00000 1.00000

Isn't that what you would expect from in-place modification of an
array? At first, a[a[0]]==a[0] is set to 1, then a[a[1]]==a[2] is
set to 1, then a[a[2]]==a[1] is set to 1, not a[4], because a[2]
has been changed by a previous operation. a[a[3]]==a[6] is set to
1, also a[a[4]]==a[8], then IDL's rules regarding array subscripts
kick in and all the other subscripts cause a[9] to be set to 1.

The question is, should this kind of expression be illegal, or cause
a warning, or should the language define a less confusing behaviour?
Or at least be consistent across versions and platforms?

chl

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[Message index]

		Oh No... By: mfein2 on Wed, 18 April 2007 04:52
		Re: Oh No... By: Carsten Lechte on Wed, 18 April 2007 12:21
		Re: Oh No... By: Foldy Lajos on Wed, 18 April 2007 11:44

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