[Expm-developers] R package 'expm' - release to CRAN?

Vincent Goulet Vincent.Goulet at act.ulaval.ca
Fri Jun 18 13:57:01 CEST 2010

Hi Martin,

Thank you for this initiative.

I wholeheartedly support releasing expm to CRAN. Any chance it becomes a Recommended package? If Matrix depends on it, that would make sense.

Also, can we get a publication out of this, say in JSS? I'd be willing to contribute my fait share in this area.



Le ven. 18 juin à 06:47, Martin Maechler a écrit :

> Dear 'expm' co-developers,
> After Michael Stadelmanns master thesis finished here at ETH,
> more than a year ago, which provided one or two new state-of-the-art matrix
> exponential algorithms, and the Matrix-Log + Matrix-Sqrt,
> not much has happened
> though I've noticed that Nick Higham has produced yet another
> improvement to his algorithm, namely: 
>    author =    {Awad H. Al-Mohy and Nicholas J. Higham},
>    year =      2009,
>    title =     {A New Scaling and Squaring Algorithm for the Matrix Exponential},
>    journal =   {SIAM Journal on Matrix Analysis and Applications},
>    volume =    31,
>    number =    3,
>    pages =     {970-989},
> ( I have added the reference to expm/inst/doc/expm.bib )
> But our 'expm' package is still only on R-forge and hence not
> really much visible in the R using comunity.
> Also, the recommended Matrix package which has provided expm()
> for a long time, still only provides "Ward77"
> which is clearly sub-optimal given Higham's work.
> OTOH, in some way, 'expm' is now an "extension" to the Matrix package
> (as it 'Depends' on it anyway, e.g. for using  Matrix::norm()),
> providing extra features.
> In light of this, I'd like to release 'expm' to CRAN
> ASAP, and just wanted to get feedback from you before doing
> that.
> Best regards,
> Martin
> Martin <Maechler at stat.math.ethz.ch>  http://stat.ethz.ch/people/maechler
> Seminar für Statistik, ETH Zürich  HG G 16      Rämistrasse 101
> CH-8092 Zurich, SWITZERLAND
> phone: +41-44-632-3408       fax: ...-1228      <><
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