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Re: include file? [message #20508 is a reply to message #20494]

Thu, 29 June 2000 00:00

Robert Weiss
Messages: 5
Registered: February 2000

Junior Member

Hello,

what you are looking for are common blocks. Start the onlice documentation
and look up 'common blocks' in the index. If you're familiar with
FORTRAN: the concept is quite the same.

Another possibility (one that I prefer because I'm always suspicious of
global variables) is to use a structure of constants (with pointers if the
the constants are larege arrays) and explicitly include the structure in
the call to your functions and procedures.

Hope that helps,

Robert.

P.S.: If it's physical constants your using it's most convenient to define
them in the idl_startup.pro file, sice you can then always refer to them
without problems (on a UNIX system it is the necessary to set the
environment variable IDL_STARTUP to this file, for WinDO$ and
MAC I dunno...).

Stu wrote:

> Hi,
> I have several different routines that all set up the same or slightlly
> different constants etc at the beginning,
> is it possible to have all the constants in one file, and have all my
> functions/procedures reference this file
> when they start? It would make for easier maintainence this way. How
> would it be done? I can't see a
> normal function or procedure doing the job as you would have to ask for
> each constant explicitly, which is a
> bit of a pain.
>
> cheers,
> Stu

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[Message index]

		Re: include file? By: Steve Hartmann on Fri, 30 June 2000 00:00
		Re: include file? By: Martin Schultz on Fri, 30 June 2000 00:00
		Re: include file? By: promashkin on Thu, 29 June 2000 00:00
		Re: include file? By: John-David T. Smith on Thu, 29 June 2000 00:00
		Re: include file? By: R.G. Stockwell on Thu, 29 June 2000 00:00
		Re: include file? By: promashkin on Thu, 29 June 2000 00:00
		Re: include file? By: John-David T. Smith on Thu, 29 June 2000 00:00
		Re: include file? By: Robert Weiss on Thu, 29 June 2000 00:00

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