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Re: resizing system variable [message #82569 is a reply to message #82568]

Thu, 20 December 2012 21:06

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Craig Markwardt writes:

> Actually, I think that David would argue that system variables
> are inappropriate for use as global variables for exactly
> the same reason as common blocks. Global variables can
> pin you down in painful ways when you try to scale/enhance
> your program.
>
> [ Don't tell David I mentioned this, but common blocks
> are actually more flexible than system variables because
> common block variables can be redefined - even redimensioned
> whenever you wish. ]

You know I'm standing here, right?

> You've got a system that works, I would stick with it now.
>
> When designing a new system, I usually define a structure
> with all of those quantities and then pass that structure around.

I wish I knew my own mind as well as everyone else seems
to know it. I'm pretty sure you could count the times I have
used a common block on one hand. But, truthfully, I could
say the same about defining my own system variable.

I suppose I would use them more if I could think of some
good reason to do so. But, nothing seems to come to mind. ;-)

> [ Actually, if I were designing my IDL library from scratch, I would start with Python. :-]

You guys really do make me smile, you know. I wish all of you
a Happy Christmas and a Merry New Year!

Cheers,

David

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

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[Message index]

		Re: resizing system variable By: Paul Van Delst[1] on Fri, 21 December 2012 08:29
		Re: resizing system variable By: Craig Markwardt on Thu, 20 December 2012 22:50
		Re: resizing system variable By: David Fanning on Thu, 20 December 2012 21:06
		Re: resizing system variable By: Craig Markwardt on Thu, 20 December 2012 20:33
		Re: resizing system variable By: David Fanning on Thu, 20 December 2012 15:14
		Re: resizing system variable By: astroboy.20000 on Thu, 20 December 2012 13:44
		Re: resizing system variable By: Craig Markwardt on Thu, 20 December 2012 12:28

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