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Re: memory allocation on Macs [message #61026 is a reply to message #60098]

Fri, 27 June 2008 06:40

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Jun 26, 7:43 pm, Keflavich <keflav...@gmail.com> wrote:
I think a big part of the problem is that the
> astron routines copy a lot of the arrays. Euler is one place it
> crashes, one of the WCS rotation programs is another.
>

Yeah, Euler is not at all concerned about memory issues. Besides
performing all calculations in double precision, it makes sure that
the original arrays are not modified, and precomputes arrays of
trigonometric quantities (e.g. sin(ra))

I've put an udpated version of euler.pro on
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/euler.pro
which is more careful about memory issues. Let it update the input
arrays ,e.g.

IDL> euler, ra,dec,select=1

But considering that you have problems with other routines too, I'd
probably chunk your processing, so, for example, you only process 50
million coordinates at a time.

> also, isn't euler's syntax 'euler,ra,dec,glon,glat,1' ?

Yep, my fingers were typing faster than my brain was thinking...

--Wayne

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[Message index]

		memory allocation on Macs By: pgrigis on Thu, 01 May 2008 09:18
		Re: memory allocation on Macs By: pgrigis on Mon, 05 May 2008 13:49
		Re: memory allocation on Macs By: Keflavich on Thu, 26 June 2008 12:14
		Re: memory allocation on Macs By: dcleon@gmail.com on Mon, 05 May 2008 06:49
		Re: memory allocation on Macs By: henrygroe on Sat, 03 May 2008 07:20
		Re: memory allocation on Macs By: wlandsman on Fri, 27 June 2008 06:40
		Re: memory allocation on Macs By: Keflavich on Thu, 26 June 2008 16:43
		Re: memory allocation on Macs By: wlandsman on Thu, 26 June 2008 13:54

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