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Re: About keywords and positional parameters [message #32818 is a reply to message #32720]

Thu, 07 November 2002 08:57

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

lily_zhang (fengliza@sina.com) writes:

> Would you tell me how to distinguish the keywords and positional
> parameters in IDL procedures and functions?

Positional parameters are those variables that come
after the command name. They have a position after
the name (1, 2, 3, etc.). Keyword parameters also come
after the command name, but they have a KEYWORD=variable
(or sometimes a /KEYWORD, which means KEYWORD=1)
appearance. Keyword parameters can come in any order
and don't affect the count of positional parameters.

You can't tell from looking whether a positional or
keyword parameter is an input parameter or an output
parameter (or both). You have to read the documentation
to discover this.

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		About keywords and positional parameters By: fengliza on Thu, 07 November 2002 08:15
		Re: About keywords and positional parameters By: David Fanning on Fri, 08 November 2002 12:32
		Re: About keywords and positional parameters By: JD Smith on Fri, 08 November 2002 11:45
		Re: About keywords and positional parameters By: David Fanning on Thu, 07 November 2002 13:15
		Re: About keywords and positional parameters By: JD Smith on Thu, 07 November 2002 12:37
		Re: About keywords and positional parameters By: R.G. Stockwell on Thu, 07 November 2002 10:26
		Re: About keywords and positional parameters By: David Fanning on Thu, 07 November 2002 08:57

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