[R] how to add a derived column to a data frame?
savicky at praha1.ff.cuni.cz
Sun Jan 16 10:59:27 CET 2011
On Sun, Jan 16, 2011 at 03:01:49PM +0800, r-help wrote:
> I have a data frame with 10 columns: A:J and I want to have the output as a data frame with 11 columns, the value of 11th column is??
> for each row, if any column can be divided by 13, then the 11th column has a values of 1, otherwise, it has a value of 0. How to do that?
> input is
I am sorry for an error in the previous solution for a general
matrix. It should be, for example
x <- as.numeric(rowSums(a %% 13 == 0) != 0)
b <- cbind(a, x)
x <- (rowSums(a %% 13 == 0) != 0) + 0
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