Hi there,
I try to calculate the cumsum of row and column of a matrix as follows.
> m <- matrix(1:10, ncol = 2)
> m
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
> apply(m, 1, cumsum)
[,1] [,2] [,3] [,4] [,5]
[1,] 1 2 3 4 5
[2,] 7 9 11 13 15
> apply(m, 2, cumsum)
[,1] [,2]
[1,] 1 6
[2,] 3 13
[3,] 6 21
[4,] 10 30
[5,] 15 40
My question is why the dim of the return value of apply(m, 1, cumsum) is
not 5x2, but 2x5.
Best,
Jinsong
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