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Re: Structure creation [message #80536 is a reply to message #3992]

Wed, 20 June 2012 07:06

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On 20 juin, 13:01, John Coxon <john.co...@gmail.com> wrote:
> On 20/06/2012 11:21, Carsten Lechte wrote:
>
>
>
>
>
>> On 20/06/12 12:07, John Coxon wrote:
>>> Hi there,
>
>>> Having an odd issue with creating structures.
>
>>> idl > med = {avg1, dawnR1:0.0, duskR1:0.0, dawnR2:0.0, duskR2:0.0}
>>> idl > print,med.dawnR1
>>> 0
>>> idl > help,med.dawnR1
>>> <Expression> INT = 0
>
>> I would guess that you previously defined a structure with name avg1
>> that had dawnR1 as an integer. dawnR1's type is determined by the
>> initialisiation value from the very first use of the structure. A naked
>> "40" or "0" is interpreted by IDL as an integer constant.
>
>> Either change to using unnamed structures, or be extra careful when
>> specifying values, e.g. always do 1.0 when you want float, 1d0 when you
>> want double, 40L for long etc.
>
> I see, that would make sense. Is there any way to clear a structure, for
> instance, between two runs of a program?
>
> --
> John Coxonhttp://www.chickensinenvelopes.net/
>
>

If your structure has only numeric fields:

for i=0,N_Tags(your_struct)-1 do your_struct.(i) = 0

alx.

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[Message index]

		Structure Creation with Execute By: msreeve on Tue, 11 April 1995 00:00
		Re: Structure Creation with Execute By: Greening C M on Wed, 19 April 1995 00:00
		Re: Structure Creation with Execute By: wmc on Tue, 18 April 1995 00:00
		Re: Structure creation By: Michael Galloy on Wed, 20 June 2012 09:11
		Re: Structure creation By: lecacheux.alain on Wed, 20 June 2012 07:06
		Re: Structure creation By: John Coxon on Wed, 20 June 2012 04:01
		Re: Structure creation By: Carsten Lechte on Wed, 20 June 2012 03:21

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