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Re: dereference with wildcard [message #69815 is a reply to message #69735]

Wed, 10 February 2010 12:16

PimK
Messages: 4
Registered: February 2010

Junior Member

On Feb 9, 1:05 pm, Carsten Lechte <c...@toppoint.de> wrote:
> PimK wrote:
>> print, mean( (*(*(*pState).navtrack)[*]).lat )
>> % Expression must be a scalar in this context: <POINTER Array[2]>.
>
> This is because you can only dereference scalar pointers. This is a fundamental
> limitation of IDL's arrays: all array elements have to be of the same scalar
> type. You can have arrays of pointers to anything, since the array is made up
> of things of the same type (i.e. pointers). If you dereferenced the whole array,
> you would have an array of "anything", which is not allowed. IDL refuses to
> evaluate the expression, even if all the pointers pointed to a scalar integer,
> and the resulting array would be legal in IDL.
>
> chl

Thanks for the feedback! I'll use loop then instead.
Cheers, P.

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		Re: dereference with wildcard By: Carsten Lechte on Tue, 09 February 2010 09:05
		Re: dereference with wildcard By: PimK on Wed, 10 February 2010 12:16

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