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Re: System Variables: defining and using [message #11720 is a reply to message #11594]

Sun, 03 May 1998 00:00

mallors
Messages: 76
Registered: November 1997

Member

In article <6ihdnf$rc8$1@ratatosk.uio.no>,
steinhh@ulrik.uio.no (Stein Vidar Hagfors Haugan) writes:
>
>> Apparently IDL
>> requires the system variable to be defined at compile time.
>
> Yes, that's right. Which means they should preferably be defined
> in the IDL_STARTUP file. There is one way of getting around this,
> though. In your case, write
>
> dummy = execute("endian = !little_endian")
> return,endian
>
> instead of simply return,!little_endian. This will allow your
> routine to compile, and define the system variable before it's
> used.
>

From the file 51new.txt that was distributed with 5.1b3:

"Note also that system variables can now be defined
after code that references them is compiled (or even
in the same routine) and IDL will correctly resolve the
reference as long as the variable exists at the time the
referencing code executes."

I tried the is_little_endian() function, and it works fine
with 5.1b3. I think 5.1 is due to be released any day now.

Regards,

-bob mallozzi

--
Robert S. Mallozzi
http://cspar.uah.edu/~mallozzir/

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[Message index]

		System Variables: defining and using By: Ray Muzic on Tue, 28 April 1998 00:00
		Re: System Variables: defining and using By: mallors on Sun, 03 May 1998 00:00
		Re: System Variables: defining and using By: steinhh on Sun, 03 May 1998 00:00

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