search for: gugarl1980

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2007 Oct 05
4
Replacing NA values when building matrix using tapply
Hi, I'm building a matrix m from a data frame d which includes the matrix row, column and value. This works well enough: m <- tapply(d[,"value"],d[,c("row","column")],c) However, I'd like to replace any missing values with 0, not NA. The obvious doesn't work, however: m <-