[R] Converting a data frame with values into a matrix/

[hadley wickham]

>  mm1  <- cast(mm, Class~Name)
>  aba <- mm1[,2:6]
>  aba[is.na(aba)] <- 1
>  final <- data.frame(mm1$Class, aba)
>  names(final) <- names(mm1)
>  final

You can abbreviate all this to:

final <- cast(mm, Class ~ Name, fill = 1)

Hadley

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