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Re: HELP: IDL Function/Variable Problem [message #5172]

Mon, 16 October 1995 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

hrebhan@awi-bremerhaven.de (Helge Rebhan) writes:

> Be sure that the function CASPER_BORESIGHT is compiled *before* any
> reference to it. Otherwise a default variable is created.

I'm not sure that this is entirely true. I believe that it is sufficient if
the function is in the IDL search path !PATH. Presuming, of course, that it's
in a file called casper_boresight.pro. I almost never use .RUN directly.
Instead I put each procedure or function in a .pro file of the same name and
depend on IDL to automatically compile it for me.

One problem that I have run into is that if one has a function reference that
uses a keyword, and that function is not in the path, and one tries to compile
a procedure referencing that function, then IDL generates an error. IDL
apparently goes through the following steps when it sees something that might
be a function, going through each step until a match is found:

1. Checks to see if that function has already been compiled.
2. Looks for a .pro file of the same name in the current directory or
in !PATH.
3. Assumes that it's a variable instead of a function.

The problem is that if step 3 is reached, but the function call uses a keyword,
then a syntax error is generated.

Bill Thompson

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[Message index]

		Re: HELP: IDL Function/Variable Problem By: thompson on Mon, 16 October 1995 00:00
		Re: HELP: IDL Function/Variable Problem By: Tim Patterson on Fri, 13 October 1995 00:00
		Re: HELP: IDL Function/Variable Problem By: hrebhan on Fri, 13 October 1995 00:00

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