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Re: God save me! [message #87342 is a reply to message #87226]

Sun, 26 January 2014 06:02

zbjiang803109
Messages: 5
Registered: January 2014

Junior Member

在 2014年1月16日星期四UTC-3下午7时08分19秒，Heinz Stege写道：
> 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

Yes, you're right. When I use the previous option, the error message appears again. When I run .compile COLORBAR and then compile the program, it passes.

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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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