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Re: Preserving Variables [message #10190 is a reply to message #10183]

Thu, 30 October 1997 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Matthew Hanson <matt@ktaadn.com> writes:

> Hello,
> Anyone know how to make statis variables? That is, upon returning to a
> function, how can i create a variable that has the same value as when i
> left the function before? I really don't want to use Common Blocks.
> -matt

I understand your concern about common blocks, but if a common block is
restricted to a single routine for the sole purpose of retaining information
between calls, then I think most of those concerns disappear. I make such a
"private" common block have the same name as the routine, to avoid running into
a common block of the same name from another routine.

The other way to preserve data, of course, is to use DEFSYSV to define a global
system variable, but that can be rather awkward.

It would be nice if IDL had a RETAIN statement, similar to the COMMON
statement, that could be used to retain internal variables between calls.

Bill Thompson

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[Message index]

		Re: Preserving Variables By: Stein Vidar Hagfors H on Fri, 31 October 1997 00:00
		Re: Preserving Variables By: thompson on Thu, 30 October 1997 00:00
		Re: Preserving Variables By: R. Bauer on Wed, 29 October 1997 00:00
		Re: Preserving Variables By: davidf on Tue, 28 October 1997 00:00

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