On Tue, 2011-08-16 at 12:10 -0500, Stuart Luppescu wrote:
> but when I use the ifelse() as above, I get this:
>[,1] [,2] [,3] [,4]
> [1,] 0.0417 0.0417 0.0417 0.0417
> [2,] 0. 0. 0. 0.
Oh, I see. ifelse() returns a value
On Aug 16, 2011, at 1:10 PM, Stuart Luppescu wrote:
Hello all, I need to extract rows and columns from a data frame and
put
them in a matrix. In some cases, there are no rows in the data frame
meeting the selection criteria. For those rows I want to put a row of
0's in the matrix. Here's my c
Hello all, I need to extract rows and columns from a data frame and put
them in a matrix. In some cases, there are no rows in the data frame
meeting the selection criteria. For those rows I want to put a row of
0's in the matrix. Here's my clumsy code:
tab1.m1 <- matrix(0, nrow=2, ncol=4)
tab1.m1
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