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Re: Order of argument evaluation (Was: Re: making a checkerboard array?) [message #56013 is a reply to message #56008]

Wed, 26 September 2007 07:18

pgrigis
Messages: 436
Registered: September 2007

Senior Member

Allan Whiteford wrote:
> [...]
>
> Anyway, the real point of my post is to ask if I'm allowed to do the
> above. For a more reasonable example am I allowed to do:
>
> plot,(x=findgen(11)),x^2
>
> and rely on the first argument of plot being evaluated before the second
> argument (and the side effect of creating 'x') similarly for creating an
> array and editing in place, e.g.:
>
> IDL> ((a=fltarr(3)))[1]=10
> IDL> print,a
> 0.00000 10.0000 0.00000
>

I guess a danger signal would be appropriate
near such statements, after all this can quickly
get out of control ;-)

IDL> delvar,c
IDL> c[(c=[0,1])]=(c=[1,2,3])
IDL> print,c
1 1 3

Now, go figure this one out...

Ciao,
Paolo

> Does anyone else do this or just me? I tend to only do things like this
> at the command line and don't embed it in programs out of fear that
> it's going to stop working one day. It also arguably makes the code less
> readable but as a pattern it's probably not that bad. I'd like to know
> what others think.
>
> Thanks,
>
> Allan

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[Message index]

		Re: Order of argument evaluation (Was: Re: making a checkerboard array?) By: Allan Whiteford on Wed, 26 September 2007 09:51
		Re: Order of argument evaluation (Was: Re: making a checkerboard array?) By: Foldy Lajos on Wed, 26 September 2007 07:39
		Re: Order of argument evaluation (Was: Re: making a checkerboard array?) By: pgrigis on Wed, 26 September 2007 07:18
		Re: Order of argument evaluation (Was: Re: making a checkerboard array?) By: Allan Whiteford on Wed, 26 September 2007 06:37
		Re: Order of argument evaluation (Was: Re: making a checkerboard array?) By: David Fanning on Wed, 26 September 2007 06:17

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