[R] factor matrix
Adrian Baddeley
adrian at maths.uwa.edu.au
Fri Dec 3 06:45:19 CET 2004
Sorry if this is a FAQ.
Is there a good reason why a factor has to be
a one-dimensional vector and cannot be a matrix?
I want to construct matrices of categorical values.
Vain attempts like
matrix(factor(c(T,F,F,T), 2,2)
yield a matrix of character strings representing the factor levels,
not the levels themselves, while
factor(matrix(c(T,F,F,T), 2,2))
converts the matrix to a logical vector of length 4
then converts the vector to a factor.
Tia
---
Adrian Baddeley
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