[R] qda problem

[Christian Hennig]

Hi,

the following strange error appears when I use qda:

> qda1 <- qda(as.data.frame(mfilters[cvtrain,]),as.factor(traingroups))
Error: function is not a closure

That's also strange:
> qda1 <- qda(mfilters[cvtrain,],as.factor(traingroups))
Error in qda.default(mfilters[cvtrain, ], as.factor(traingroups)) : 
	length of dimnames must match that of dims

Some backgroud:
> str(mfilters[cvtrain,])
 num [1:12500, 1:12] -0.426  0.937 -1.610 -2.099  0.749 ...
 - attr(*, "dimnames")=List of 2
  ..$ : chr [1:12500] "1" "2" "8" "9" ...
  ..$ : NULL
> str(as.factor(traingroups))
 Factor w/ 3 levels "1","2","3": 1 1 1 1 1 1 1 1 1 1 ...
 - attr(*, "names")= chr [1:12500] "1" "2" "8" "9" ...
> str(as.data.frame(mfilters[cvtrain,]))
`data.frame':	12500 obs. of  12 variables:
 $ V1 : num  -0.426  0.937 -1.610 -2.099  0.749 ...
 $ V2 : num   0.7970 -1.9004  0.0443 -1.2074  0.4095 ...
 $ V3 : num  -0.303 -0.636 -0.806  0.639  0.363 ...
 $ V4 : num   0.130 -0.096 -0.644  0.723  0.576 ...
 $ V5 : num  -0.2942  1.4951 -0.0098  0.3253  0.3881 ...
 $ V6 : num  -0.2943 -0.6561 -0.0863 -0.0849 -0.5070 ...
 $ V7 : num   0.512 -0.618 -0.244  0.392  0.346 ...
 $ V8 : num  -0.171  0.677  0.117 -0.113  0.669 ...
 $ V9 : num   0.2289 -0.3934  0.1051  0.1545 -0.0446 ...
 $ V10: num   0.0188  0.5614 -0.2271  0.0340  0.2207 ...
 $ V11: num  -0.152  0.631  0.447  0.696  0.458 ...
 $ V12: num   0.6139 -0.9379 -1.1784  0.0802 -0.6625 ...

...looks proper to me and works without problems with svm...

Even stranger is the fact that my .R file suggests that the first command
qda1 <- qda(as.data.frame(mfilters[cvtrain,]),as.factor(traingroups))
worked in December for the same data (apart from random sampling of 
cvtrain/traingroups, but I tried more than one version), and
even under the same version of R (1.8.0).

Can anybody tell me what goes wrong now?

Best,
Christian

***********************************************************************
Christian Hennig
Fachbereich Mathematik-SPST/ZMS, Universitaet Hamburg
hennig at math.uni-hamburg.de, http://www.math.uni-hamburg.de/home/hennig/
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ich empfehle www.boag-online.de