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Re: God save me! [message #87229 is a reply to message #87226]

Fri, 17 January 2014 06:30

Yngvar Larsen
Messages: 134
Registered: January 2010

Senior Member

On Thursday, 16 January 2014 23:08:19 UTC+1, Heinz Stege wrote:
> 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.

You can help the IDL interpreter figuring this out:

http://www.exelisvis.com/docs/FORWARD_FUNCTION.html

That being said, it is highly recommended that you use the idl2 compile option. Personally, I think it also more human readable with [] instead of () for the same reason as for the compiler: array indexing vs function call. And using round brackets for array indexing has been deprecated since IDL 5.0 (March 1997!). I'm not sure why this compile option is not default in 2014, almost two decades later. FUD regarding breaking of old code?

--
Yngvar

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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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