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Re: Code optimization [message #75139 is a reply to message #75134]

Wed, 16 February 2011 13:48

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Wednesday, February 16, 2011 4:25:39 PM UTC-5, kisCA wrote:
> Jeremy, I understand your disappointment about the subscript in the
> loops, but it's a code I get from a collegue who I suppose wrote it in
> Fortran and then just translate it in IDL.

Yeah, it definitely has that look to it. ;-)

> Jeremy, also, could you explain me a bit more the difference between
> [] and ().
> cov, cs, var_factor are variables.
> I am sorry I just moved to idl 3 month ago from matlab and I really
> have difficulty with "the subscript game" going on here...
> Thanks

No problem! A Long Time Ago, IDL used () for both function calls and array subscripts. But that's not a good idea, since it leads to ambiguity not just in reading code but also in executing it (what happens if you have both a variable and function with the same name?). So [] was introduced for array subscripts. Now you can use either by default, but [] is much preferred.

If you use compile_opt idl2, then you can *only* use [] (as well as a few other useful changes).

-Jeremy.

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[Message index]

		Re: Code optimization By: Jeremy Bailin on Thu, 17 February 2011 11:52
		Re: Code optimization By: kisCA on Thu, 17 February 2011 11:42
		Re: Code optimization By: Fabzou on Thu, 17 February 2011 01:14
		Re: Code optimization By: Jeremy Bailin on Wed, 16 February 2011 13:48
		Re: Code optimization By: kisCA on Wed, 16 February 2011 13:25
		Re: Code optimization By: kisCA on Wed, 16 February 2011 13:23
		Re: Code optimization By: Jeremy Bailin on Wed, 16 February 2011 12:57
		Re: Code optimization By: pgrigis on Wed, 16 February 2011 12:51
		Re: Code optimization By: Kenneth P. Bowman on Thu, 17 February 2011 12:52
		Re: Code optimization By: pgrigis on Thu, 17 February 2011 12:09

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