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Re: dealing with arguments [message #71263 is a reply to message #71119]

Wed, 02 June 2010 15:50

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

pp writes:

> pro name, mode, s1=s1, s2=s2
> s2=n_elements(s2) ne 0 ? s2 : 10
> ...
> end
>
> Which you could then call as
>
> name, 2, s2=100
>
> It would make s2=10 if it is not provided (or is given an undefined
> variable).

An alternative, which is a bit more descriptive in
your programs, is SetDefaultValue:

pro name, mode, s1=s1, s2=s2

setdefaultvalue, s1, 5
setdefaultvalue, s2, 10
...

The default value is set (using pp's notation, basically)
only if the variable is undefined when the program is run.

You can find the program here:

http://www.dfanning.com/programs/setdefaultvalue.pro

Cheers,

David

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

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[Message index]

		dealing with arguments By: fgg on Wed, 02 June 2010 14:59
		Re: dealing with arguments By: fgg on Wed, 02 June 2010 15:52
		Re: dealing with arguments By: David Fanning on Wed, 02 June 2010 15:50
		Re: dealing with arguments By: penteado on Wed, 02 June 2010 15:43
		Re: dealing with arguments By: fgg on Wed, 02 June 2010 15:22

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