[R] nu-SVM crashes in e1071

[Uwe Ligges]

On 02.03.2010 15:41, Häring, Tim (LWF) wrote:
> Hello !
>
> I`m using SVMs for multi-class classification problems. Therefore I`m using the svm() function in the package "e1071".
> If I use svm(...type="C-classification") everything works fine. But if I want to use nu-SVM with svm(..., type="nu-classification", nu=0.5) R crashes immediately. No error message - just crash.
>
> Did anybody had the same problem and maybe a solution?
> I`m using R 2.10.0 and the latest Version of e1071


Maybe for your unstated OS with unstated version of e1071 on an outdated 
version of R without a reproducible example given.

For my WinXP, R-2.10.1, e1071 1.5-22 I get:

library(e1071)
data(iris)
model <- svm(Species ~ ., data = iris, type="nu-classification")
model

#Call:
#svm(formula = Species ~ ., data = iris, type = "nu-classification")
#
#
#Parameters:
#   SVM-Type:  nu-classification
# SVM-Kernel:  radial
#      gamma:  0.25
#         nu:  0.5
#
#Number of Support Vectors:  103

Uwe Ligges





> Thanks
> TIM
>
> BTW: Using the LibSVM wrapper in Weka the same happens. Maybe there is a problem in the LibSVM code...
>
> -----------------------------------------------------------------------------------
> Tim Häring
> Bavarian State Institute of Forest Research
> Department of Forest Ecology
> Hans-Carl-von-Carlowitz-Platz 1
> D-85354 Freising
>
> E-Mail: tim.haering at lwf.bayern.de
> http://www.lwf.bayern.de
>
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