Re: passing functions as arguments in IDL?

[Benno Puetz <puetz(at)mpipsykl.mpg.de>]

David Fanning wrote:

> Rick Baer (baer@hpl.hp.com) writes:
>
> >  Is there any way to pass functions as arguments in IDL? I would
> > like to be able to do something like this:
> >...
> > IDL> print, tf1, f1, 4
>
> You can do this:
>
>  function f1, x
>     return, x*x
>  end
>
>  function tf1, func, arg
>    IF Size(func, /Type) NE 7 THEN BEGIN
>         Print, 'String argument required'
>        RETURN, -1
>    ENDIF
>     retVal = Call_Function(func, arg)
>    return, retVal
>  end
>
>    IDL> print, tf1('f1', 4)
>
> Cheers,
>
> David
> --

Would it also be possible to pass argument lists of variable length,
depending on the function to be called?

I've tried the _EXTRA keyword but to no avail ...

--
Benno Puetz
Kernspintomographie
Max-Planck-Institut f. Psychiatrie            Tel.: +49-89-30622-413
Kraepelinstr. 10                              Fax : +49-89-30622-520
80804 Muenchen, Germany