Re: [R] matrix log

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Sat 17 Jun 2006 - 01:07:34 EST

          I'm not aware of any R implementation of a logarithm of a matrix. I've seen discussions on this list of the difficulties involved in computing functions of matrices, but I know of nothing. (The 'nlme' package has 'pdLogChol', which may be related, but I think it's different.)

          I wish you luck, and I hope you will find the time to package it for the rest of us.

	  Best Wishes,
	  Spencer Graves	

Brandon.J.Whitcher@gsk.com wrote:
> Dear R users,
>
> Has anyone implemented a "matrix log" function in R similar to the
> function logm() in Matlab? I did a quick R site search and browsed the
> contributed packages to no avail.
>
> The octave function is far too simplistic and fails for the Matlab test
> matrix. Ideally, the code of Cheng, Higham, and Laub (2001) or something
> similar could be utilized. Just checking before I spend time porting
> code.
>
> cheers...
>
> Brandon
>
> Translational Medicine & Genetics
> GlaxoSmithKline
> [[alternative HTML version deleted]]
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Jun 17 01:17:36 2006

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