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2006 Nov 03
1
man page for as.matrix for data frames outdated?
...t any non-numeric/complex column into a character vector using 'format' and so return a character matrix, except that all-logical data frames will be coerced to a logical matrix. It's true that "all-logical data frames will be coerced to a logical matrix": > fourLogicals <- 2:5>3 > df1 <- data.frame(a=fourLogicals) > storage.mode(as.matrix(df1)) [1] "logical" Otherwise it's not true that 'as.matrix' will return a character matrix: > fourInts <- 2:-1 > df2 <- data.frame(a=fourLogicals, b=fou...