On Jul 6, 2009, at 3:16 PM, spime wrote:
Dear R-users,
Recently, I am facing some problems when converting mlbench data
into matrix
format.
library(mlbench)
data(BostonHousing)
X<- BostonHousing[,1:13]
If you look at X with str(), you will see it has a factor variable.
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
And since one of the variables was a factor, the result of t(X) (and
of as.matrix(X) for that matter ) becomes a character matrix. Perhaps
data.matrix(X) will serve better?
t(data.matrix(X))%*%y
[,1]
crim 25687.104
zn 168607.800
indus 111564.080
chas 12397.000
nox 6094.428
rm 73924.078
age 732581.140
dis 45713.874
rad 93445.100
tax 4287797.600
ptratio 205316.730
b 4208049.505
lstat 119799.159
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.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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