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stepfun
2009 Dec 16
1
difference between the meaning of MARGIN in sweep() and apply()
For example, subtracting 1:2 from the rows of a two-column matrix:
> t(apply(matrix(1:6,ncol=2),MARGIN=1,function(y) y - 1:2))
[,1] [,2]
[1,] 0 2
[2,] 1 3
[3,] 2 4
> sweep(matrix(1:6,ncol=2),MARGIN=2,1:2,FUN="-")
[,1] [,2]
[1,] 0 2
[2,] 1 3
[3,] 2 4
Is there a logic to this difference, or is it just a quirk of the history of
these