| Re: Initialize new variable array with nan or -9999 values [message #87654 is a reply to message #87653] |
Thu, 20 February 2014 20:11   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Heinz Stege writes:
> Yes, one should think so. But it is not true. "fltarr()-9999" ist
> faster than make_array():
>
> IDL> t0=systime(1) &for i=0,9 do a=fltarr(1000,1000,100)-9999.
> &print,systime(1)-t0 &help,a
> 1.8280001
> A FLOAT = Array[1000, 1000, 100]
> IDL> t0=systime(1) &for i=0,9 do
> a=make_array(1000,1000,100,value=-9999.) &print,systime(1)-t0 &help,a
> 2.7969999
> A FLOAT = Array[1000, 1000, 100]
> IDL> print,!version
> { x86 Win32 Windows Microsoft Windows 8.0.1 Oct 5 2010 32 64}
Oh, don't you just hate those guys who use their cell phones to fact
check everything you say! ;-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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