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Re: Bug in N_PARAMS? [message #63974]

Wed, 26 November 2008 07:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Carsten Lechte writes:

> Kenneth P. Bowman wrote:
>> to provide default values for optional parameters.
>
> I wrote this little procedure for setting default values
> that I use a zillion times a day:
>
>
> PRO defaultarg, arg, defval, VALUEGIVEN=valuegiven
>
> IF N_ELEMENTS( arg) EQ 0 THEN BEGIN
> arg = defval
> valuegiven = 0
> ENDIF ELSE valuegiven = 1
>
> END

This is a pretty good idea. I can see how it would
save some typing! :-)

Here is a slightly modified version. I'll add this,
with documentation, to the Coyote Library later today.

PRO SetDefaultValue, argument, defaultValue, BOOLEAN=boolean

; If BOOLEAN, we need just a 0 or a 1.
IF Keyword_Set(boolean) THEN BEGIN

argument = Keyword_Set(argument)

ENDIF ELSE BEGIN

; We only need assignment if the argument is undefined.
IF N_Elements(argument) EQ 0 THEN BEGIN

; If the default value is undefined, treat as BOOLEAN.
; Otherwise, assign default value to the argument.
IF N_Elements(defaultValue) EQ 0 THEN BEGIN
argument = Keyword_Set(argument)
ENDIF ELSE BEGIN
argument = defaultValue
ENDELSE

ENDIF

ENDELSE

END

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Bug in N_PARAMS? By: David Fanning on Wed, 26 November 2008 07:49
		Re: Bug in N_PARAMS? By: Carsten Lechte on Tue, 25 November 2008 23:53
		Re: Bug in N_PARAMS? By: Kenneth P. Bowman on Tue, 25 November 2008 06:29
		Re: Bug in N_PARAMS? By: David Fanning on Mon, 24 November 2008 14:20
		Re: Bug in N_PARAMS? By: Mark[1] on Thu, 27 November 2008 13:53
		Re: Bug in N_PARAMS? By: Brian Larsen on Tue, 02 December 2008 07:03
		Re: Bug in N_PARAMS? By: David Fanning on Wed, 03 December 2008 09:06

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