Hi,
Here is my implementation. Hope this helps.
> b
[1] 1 2 3 4 5
> c
[1] 1 2 1 3 5 4
> sapply(b,function(x)ifelse(x==c,1,0))
[,1] [,2] [,3] [,4] [,5]
[1,] 1 0 0 0 0
[2,] 0 1 0 0 0
[3,] 1 0 0 0 0
[4,] 0 0 1 0 0
[5,] 0 0 0 0 1
[6,] 0 0 0 1 0
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