"Thomas" == Thomas Lumley <thomas@biostat.washington.edu> writes:
Thomas> as.numeric() turns a logical matrix into a numeric
Thomas> vector. Shouldn't it stay a matrix?
One first would think so.
However, R here behaves as S.
From ?as.numeric of S-plus 3.4:
S> VALUE:
S> ....
S>
S> as.numeric returns a vector like x, but with storage mode
S> "double", if x is a simple object of mode "numeric".
S> Otherwise, as.numeric returns a numeric object of the same
S> length as x and with data resulting from coercing the
S> elements of x to mode "numeric".
The following shows the old (in S) quite usual ``workaround''.
The following code works `identically' in R and S :
Mas.numeric <- function(x){ mode(x) <- "numeric"; x}
M <- cbind("1",1:3); M
[,1] [,2]
[1,] "1" "1"
[2,] "1" "2"
[3,] "1" "3"
as.numeric(M)
[1] 1 1 1 1 2 3
Mas.numeric(M)
[,1] [,2]
[1,] 1 1
[2,] 1 2
[3,] 1 3
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