Hi, list,

suppose i have such a data frame:

trash <- 
data.frame(cbind(seq(1:5),c('a','a','b','a','b'),c('b','a','b','b','a')))
names(trash) <- c('age','typeI','typeII')

and I want to change all 'a's to be 0 and 'b's to be 1. 

temp <- as.matrix(trash)
temp[temp=='a'] <- 0
temp[temp=='b'] <- 1
temp <- data.frame(temp)

the problem was that temp$typeI and temp$typeII were still factors, 
whereas I want numeric type. How can I make it?

Thanks,
Auston
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