[R] mlbench dataset question

[spime]

Dear R-users,

Recently, I am facing some problems when converting mlbench data into matrix
format.

library(mlbench)
data(BostonHousing)
X<- BostonHousing[,1:13]
y<-BostonHousing[,14]

I want to convert X and y into matrix form. I am getting these obvious
errors...

> t(X)%*%y
Error in t(X) %*% y : requires numeric/complex matrix/vector arguments
> t(as.matrix(X))%*%(as.matrix(y))
Error in t(as.matrix(X)) %*% (as.matrix(y)) : 
  requires numeric/complex matrix/vector arguments

any kind of suggestions will be very helpful.
Thanks.
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