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Re: Initialize new variable array with nan or -9999 values [message #87663 is a reply to message #87653]

Fri, 21 February 2014 06:47

John Correira
Messages: 25
Registered: August 2011

Junior Member

On 02/20/2014 08:36 PM, Heinz Stege wrote:
> 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}

MAKE_ARRAY is faster on my machine:

IDL> tic
IDL> for i=0,9 do a=fltarr(1000,1000,100)-9999.
IDL> toc
IDL> help, a

Elapsed time is 3.018326s
A FLOAT = Array[1000, 1000, 100]

IDL> tic
IDL> for i=0,9 do a=make_array(1000,1000,100,value=-9999.)
IDL> toc
IDL> help, a

Elapsed time is 2.075103s
A FLOAT = Array[1000, 1000, 100]

IDL> print,!version
{ x86_64 linux unix linux 8.2 Apr 10 2012 64
64}

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[Message index]

		Initialize new variable array with nan or -9999 values By: morganlsilverman on Thu, 20 February 2014 10:31
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Thu, 20 February 2014 10:35
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Thu, 20 February 2014 10:37
		Re: Initialize new variable array with nan or -9999 values By: chris_torrence@NOSPAM on Thu, 20 February 2014 13:11
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Thu, 20 February 2014 13:28
		Re: Initialize new variable array with nan or -9999 values By: John Correira on Thu, 20 February 2014 10:36
		Re: Initialize new variable array with nan or -9999 values By: Paul Van Delst[1] on Thu, 20 February 2014 13:33
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Thu, 20 February 2014 13:46
		Re: Initialize new variable array with nan or -9999 values By: Paul Van Delst[1] on Thu, 20 February 2014 14:00
		Re: Initialize new variable array with nan or -9999 values By: wlandsman on Thu, 20 February 2014 14:14
		Re: Initialize new variable array with nan or -9999 values By: Heinz Stege on Thu, 20 February 2014 17:36
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Thu, 20 February 2014 20:11
		Re: Initialize new variable array with nan or -9999 values By: John Correira on Fri, 21 February 2014 06:47
		Re: Initialize new variable array with nan or -9999 values By: David Fanning on Fri, 21 February 2014 06:58

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