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foo2
2007 Feb 13
2
Matrix manipulation
Hi, let's say I have this
A = matrix(c(1, 2, 4), nrow=1)
colnames(A)=c("YOO1", "YOO2", "YOO3")
# ie
# YOO1 YOO2 YOO3
#[1,] 1 2 4
HELLO <- NULL
HELLO$YOO1="BOO"
HELLO$YOO2="BOO"
HELLO$YOO3="HOO"
and I want a matrix that will sum my categorization.. how can I do it
efficiently without any loop?
#ie BOO HOO
#[1,] 3...