kernlab sigest

hello,

I have the following problem setting parameter 'frac' in the sigest
function of the kernlab package.

## executing the ?sigest example:
library(kernlab)
data(spam)
srange <- sigest(type~.,data = spam)

## works fine...

## setting 'frac' explicitly
## (in this case even to the default of .25)
options(error=recover)
srange <- sigest(type~.,data = spam, frac = .25)

## fails..

Error in model.frame(formula, rownames, variables, varnames, extras,
extranames,  :
        variable lengths differ

Enter a frame number, or 0 to exit
1:sigest(type ~ ., data = spam, frac = 0.25)
2:sigest(type ~ ., data = spam, frac = 0.25)
3:.local(x, ...)
4:eval(m, parent.frame())
5:eval(expr, envir, enclos)
6:model.frame(data = ..1, frac = 0.25, formula = x)
7:model.frame

any ideas?

thank you,
Bjoern


---

bjoern menze
menze @ uni-hd de
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