Hi!!
I am trying to figure out how to use the string kernel "stringdot" in kernlab.
k <- function(x,y) {
(sum(x*y) +1)*exp(-0.001*sum((x-y)^2))
}
class(k) <- "kernel"
data(promotergene)
## train svm using custom kernel
gene.k <- ksvm(Class~.,data=promotergene,kernel=k,C=10,cross=5) # works fine in
this case
gene.rbf <- ksvm(Class~.,data=promotergene,kernel="rbfdot",C=10,cross=5)# works
fine with the rbf kernel
gene.string <- ksvm(Class~.,data=promotergene,kernel="stringdot",C=10,cross=5)
# this give the following error
#Error in match.arg(kernel, c("rbfdot", "polydot", "tanhdot", "vanilladot", :
# 'arg' should be one of “rbfdot”, “polydot”, “tanhdot”, “vanilladot”,
“laplacedot”, “besseldot”, “anovadot”, “splinedot”, “matrix”
What am I doing wrong here?
Thanks ../Murli
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