> -----Original Message-----
> From: r-devel-boun...@r-project.org
> [mailto:r-devel-boun...@r-project.org] On Behalf Of claus.he...@gmx.de
> Sent: Saturday, August 29, 2009 12:35 AM
> To: r-de...@stat.math.ethz.ch
> Cc: r-b...@r-project.org
> Subject: [Rd] round off errors? (PR#13918)
>
> Full_Name: Claus Pastor
> Version: 2.9.2
> OS: Windows XP
> Submission from: (NULL) (82.113.106.4)
>
>
> I use the following function to compute MutualInformation
> Matrix of factorial
> members of a dataframe. I use package minet for this:
>
> my.MI = function(test) {
> ## die Diagonale gibt die Entropien, Teile durch entropy von
> y und du erhälst
> den Zusammenhang
> ## kenne X und sage daraus y voraus
> require(minet)
> MI.matrix =
> matrix(0,nrow=length(test),ncol=length(test),dimnames=list(nam
> es(test),names(test)))
> for (i in 1:length(test)) {
> for (j in 1:length(test)) {
> temp = na.omit(test[,c(i,j)])
> MI = build.mim(temp)
> p.i = prop.table(table(temp[,1]))
> p.j = prop.table(table(temp[,2]))
> H.i = sum(-p.i*log(p.i))
> H.j = sum(-p.j*log(p.j))
> MI.matrix[i,j] = MI[1,2]/H.j
> MI.matrix[j,i] = MI[1,2]/H.i
> }
> }
> return(MI.matrix)
> }
>
>
> The function works well under R 2.8.
>
> Under R2.9.2 it produces Mutual Information values (MI) of
> more than 1 (e.g.
> 1.000013) which are not allowed. MI is in [0:1]. I suppose
> there are rounding
> errors anywhere in the new R 2.9.2.
With the argument
test = data.frame(x = gl(2, 3), y = gl(3, 2))
minet version 2.0.0 (Date: 2009-08-19) returns diagonals more than 1 and
minet version 1.6.0 (Date: 2007) returns diagonals of 1. This happens in
both R 2.9.1 and 2.9.2. I would suspect changes in minet rather than R
are the problem. Mail to the Maintainer listed in packageDescription("minet").
Bill Dunlap
TIBCO Software Inc - Spotfire Division
wdunlap tibco.com
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
