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Re: God save me! [message #87226 is a reply to message #87210]

Thu, 16 January 2014 14:08

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Thu, 16 Jan 2014 05:58:28 -0800 (PST), ??? wrote:

> Thank a lot, Heinz. Adding compile_opt idl2 works. But I wonder why sometimes the compilation passes even without the option. And later when I remove the line (compile_opt idl2) the compilation also passes.
>
Zhibo, it is nothing wrong with not using the compile option. However,
if you allow round brackets for array indexing (i.e. no compile
option), the IDL compiler or interpreter has to find out if
"colorbar(...)" is a variable or a function.

I have never read (or investigated) how IDL is doing this. (Because
for me it is convenient, to use square brackets for arrays.) I think,
IDL makes it's decision on basis of it's lists of defined variables
and compiled functions. But I don't really know.

You can try to find it out. Does the compilation pass without an error
message, when the colorbar function is already compiled? (You can
check this with "help,/routines".)

If you allow round brackets for arrays, then you must not use the same
name (in this case "colorbar") for a variable as well for a function.
(This is meant for inside of one routine. You may use "colorbar" for a
function within one routine and for a variable within another
routine.)

If you use the said compile option, everything is simple:
"y=colorbar(...)" is a function call, and "y=colorbar[...]" is array
subscripting. Note that "y=colorbar[0]" and "y=colorbar[*]" are
allowed also for scalar variables.

Hope this helps.

Cheers, Heinz

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[Message index]

		God save me! By: zbjiang803109 on Wed, 15 January 2014 17:21
		Re: God save me! By: David Fanning on Wed, 15 January 2014 17:46
		Re: God save me! By: Heinz Stege on Wed, 15 January 2014 19:22
		Re: God save me! By: zbjiang803109 on Thu, 16 January 2014 05:58
		Re: God save me! By: Heinz Stege on Thu, 16 January 2014 14:08
		Re: God save me! By: Yngvar Larsen on Fri, 17 January 2014 06:30
		Re: God save me! By: zbjiang803109 on Sun, 26 January 2014 06:02

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