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Re: Procedures with variable/dynamic argument list?? [message #73075 is a reply to message #73037]

Fri, 22 October 2010 08:50

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Oct 22, 11:14 am, Chris Torrence <gorth...@gmail.com> wrote:
> On Oct 22, 8:26 am, Paolo <pgri...@gmail.com> wrote:
>
>
>
>
>
>> It comes out pretty ugly indeed... here my "pritn" function
>> that I use to work around my bad spelling (!)
>> I guess I didn't know about n_params() when I wrote that.
>
>> Ciao,
>> Paolo
>
>> PRO pritn,a1,a2,a3,_extra=_extra
>
>> IF exist(a3) THEN print,a1,a2,a3,_extra=_extra ELSE $
>> IF exist(a2) THEN print,a1,a2,_extra=_extra ELSE $
>> IF exist(a1) THEN print,a1,_extra=_extra
>
>> END
>
>> ;from solarsoft
>> function exist,var
>
>> return,n_elements(var) ne 0
>
>> end
>
> Hi all,
>
> You might look at SCOPE_VARFETCH. You could dynamically construct the
> argument name, and then pass the string to SCOPE_VARFETCH to retrieve
> the value. Something like:
>
> PRO pritn,a1,a2,a3,_extra=_extra
> for i=1,n_params() do print, SCOPE_VARFETCH('a'+strtrim(i,
> 2)),_extra=_extra
> end
>
> This only helps in cases where you can break up the arguments and do a
> call with each one separately.
>
> Paolo, if I could suggest a tweak, you could use a CASE statement
> instead:
>
> case n_params() of
> 1: print,a1,_extra=_extra
> 2: print,a1,a2,_extra=_extra
> 3: print,a1,a2,a3,_extra=_extra
> else: message,'Incorrect number of arguments'
> endcase
>

Yes, the CASE version is nicer and that's how I would have
wrote it if I had known about n_params() back then... :)
You always learn something new :)

Thanks,
Paolo

> This avoids all of those nasty if/else blocks.
>
> -Chris
> ITTVIS

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[Message index]

		Re: Procedures with variable/dynamic argument list?? By: Michael Galloy on Mon, 25 October 2010 06:51
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Mon, 25 October 2010 00:32
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 08:50
		Re: Procedures with variable/dynamic argument list?? By: chris_torrence@NOSPAM on Fri, 22 October 2010 08:14
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 07:26
		Re: Procedures with variable/dynamic argument list?? By: Kenneth P. Bowman on Fri, 22 October 2010 06:56
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Fri, 22 October 2010 02:04
		Re: Procedures with variable/dynamic argument list?? By: Gray on Fri, 22 October 2010 01:57

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