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Re: TOTAL gives totally different result on identical array [message #76885]

Fri, 08 July 2011 12:10

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 7/8/11 12:48 PM, Liam Gumley wrote:
> If you just want to compute the total over all dimensions of an array,
> you could use it as a drop in replacement for TOTAL. However it would
> take a bit more work to support all the optional keywords accepted by
> TOTAL.

Certainly no drop in replacement for TOTAL, but a DLM implementation of
the Kahan summation:

http://michaelgalloy.com/2011/07/08/dlm-implementing-kahan-s ummation.html

It doesn't implement the keywords of TOTAL, but it does support all
numeric IDL types, i.e., in the manner of /PRESERVE_TYPE. It also shows
how you can use C macros to implement an algorithm for multiple data
types (ugly, but better than copying code).

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL, A Guide to Learning IDL: http://modernidl.idldev.com
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: TOTAL gives totally different result on identical array By: Michael Galloy on Fri, 08 July 2011 12:10
		Re: TOTAL gives totally different result on identical array By: Liam Gumley on Fri, 08 July 2011 11:48
		Re: TOTAL gives totally different result on identical array By: Foldy Lajos on Fri, 08 July 2011 11:33
		Re: TOTAL gives totally different result on identical array By: Fabzou on Fri, 08 July 2011 10:46
		Re: TOTAL gives totally different result on identical array By: Liam Gumley on Fri, 08 July 2011 10:25
		Re: TOTAL gives totally different result on identical array By: Foldy Lajos on Fri, 08 July 2011 08:44
		Re: TOTAL gives totally different result on identical array By: Liam Gumley on Fri, 08 July 2011 07:37
		Aw: Re: TOTAL gives totally different result on identical array By: M. Suklitsch on Fri, 08 July 2011 05:55
		Re: TOTAL gives totally different result on identical array By: Fabzou on Fri, 08 July 2011 03:34

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