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Re: weird behaviour with cgdemodata [message #76619 is a reply to message #76618]

Tue, 21 June 2011 08:27

ben.bighair
Messages: 221
Registered: April 2007

Senior Member

Hi,

On 6/21/11 10:26 AM, Jeremy Bailin wrote:
> I'm sure there's a good reason why this happens, but it has me very confused:
>
> IDL> i = 5
> IDL> print, i, n_elements(cgdemodata(i))
> 4 65536
>
> Okay, that looks fine. Now what if I put that in a for loop?
>
>
> IDL> for i=0,5 do print, i, n_elements(cgdemodata(i))
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> 0 101
> ...repeat ad infinutm, i.e. until you hit Ctrl-C
>
>
> What is going on???
>
> -Jeremy.

It looks like David overwrites the positional argument "number" in his
code - which you pass in as "i". "i" keeps getting reset to 0 in the
loop. It's the old pass-by-reference thing. I have posted a fix here...

http://dl.dropbox.com/u/8433654/cgdemodata.pro

but I'll send it along to David so he can decide what to do for the long
run.

Cheers,
Ben

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[Message index]

		Re: weird behaviour with cgdemodata By: David Fanning on Tue, 21 June 2011 10:53
		Re: weird behaviour with cgdemodata By: Jeremy Bailin on Tue, 21 June 2011 09:28
		Re: weird behaviour with cgdemodata By: Foldy Lajos on Tue, 21 June 2011 09:10
		Re: weird behaviour with cgdemodata By: Jeremy Bailin on Tue, 21 June 2011 08:49
		Re: weird behaviour with cgdemodata By: Jeremy Bailin on Tue, 21 June 2011 08:28
		Re: weird behaviour with cgdemodata By: ben.bighair on Tue, 21 June 2011 08:27
		Re: weird behaviour with cgdemodata By: wlandsman on Tue, 21 June 2011 08:19

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