| Is there a fast Complex ATAN in IDL 5.5? [message #31731] |
Thu, 15 August 2002 16:57  |
MKatz843
Messages: 98
Registered: March 2002
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Member |
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I've avoided switching to IDL 5.5 for some time now because I use
ATAN() to produce the phase of complex data. In my simple tests with
IDL 5.4,
ATAN(x) runs over 30% faster than
ATAN(imaginary(x),float(x)).
I use ATAN() a great deal, and in real-time feedback applications with
512x512 arrays where time is important.
Does anyone know
(A) Is there a new, fast ATAN() available that can process my complex
data a la IDL 5.4?
(B) Is there a way to hack the IDL libraries to put the old ATAN
function into the newer IDL library to recover the old behavior?
Thanks,
M. Katz
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| Re: Is there a fast Complex ATAN in IDL 5.5? [message #31864 is a reply to message #31731] |
Tue, 20 August 2002 17:43  |
the_cacc
Messages: 104
Registered: October 2001
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Senior Member |
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Hey!
Complex support is patchy to say the least in IDL... as I've ranted
here before. They should just SORT IT OUT!!! If *I* can write
CALL_EXTERNAL commands to mimic IDL functions but also accept complex
args, then surely the comp. sci. experts at RSINC can!?!
Let's start with: SVDC and all the other matrix operations, all the
sparse array operations, CURVEFIT and other fitting routines.
As always,
Ciao.
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