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sediff
2005 Aug 29
2
reexpand a matrix after subsetting
Hi,
suppose I have a matrix (or dataframe)
as a result from subsetting.
mat <- matrix(1:20,ncol=2)
mat[c(3,6,9),] <- NA
cc <- complete.cases(mat)
sub <- mat[cc,,drop=FALSE]
sub <- sub * 2
#some caluculations with sub.
now I would like to expand sub somehow
so row 3,6, and 9 would be filled with
NAs but the rest should be in place again.
Is there a simple function for this?