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edberg
2006 Jan 30
1
Varying results of sammon(), for the same data set
Hello,
I have a data set on which I run the sammon algorithm as follows:
library(MASS)
data = read.table('problemforr.dat')
y = cmdscale(data, add=TRUE)
s = sammon(data, y$points)
(In case it should be relevant, I make the data available at
http://idi.ntnu.no/~edsberg/problemforr.dat)
With R 2.2.1 on Debian Sid I always get one of two solutions (stress
1.74288 after 10 iterations or stress 1.33629 afer 9 iterations). I
always get the same result within the same R session, even if I read
the data again. With R 2.2.0 on SunOS 5.9 I always get the same result
(str...