Since you are talking about a contributed package: Please send feature
requests to the package maintainer:
> maintainer("e1071")
[1] "Friedrich Leisch <friedrich.lei...@r-project.org>"
It is even a better idea to send him your own code suggestions so that
it will be quicker to add the requested features to the package.
Best,
Uwe Ligges
On 15.07.2011 10:11, Tim Smyth wrote:
I was wondering if it was possible to add an extra option to the cmeans
function please? In a recent paper by Moore et al.,(2009) they state:
"The fuzzy membership function is: 1 - F(Z2), where Z2 is a squared
Mahalanobis distance and F is a cumulative chi-square distribution. The
Mahalanobis distance is the multivariate equivalent of the standardised
random variable Z = (X - M)/S, which is the distance of the univariate
random variable X from its mean M normalised by the standard deviation S.
In other words, the Mahalanobis distance is a weighted form of the
Euclidean, and is preferable because it incorporates the shape of the the
distribution of points around the cluster centre (i.e., the geometric shape
of the point cloud expressed in terms of variance). The fuzzy membership
ranges from 0 to 1 ..."
so as well as having a dist = "euclidean" option, would it be possible to
have a dist = "mahalanobis" option please? I realise that this is quite an
ask - you could even point me in the right direction of where to start
editing code and getting it compiled on my own machine.
Tim Smyth
ref: T.S. Moore et al. Remote Sensing of Environment 113 (2009) 2424-2430
--
View this message in context:
http://r.789695.n4.nabble.com/fuzzy-c-means-algorithm-in-e1071-tp3669374p3669374.html
Sent from the R devel mailing list archive at Nabble.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
