On Sat, 2007-09-15 at 12:11 -0400, Letticia Ramlal wrote:
> Hello
> I was wonderinf if anyone can help me with this problem, it seems trivial but
> for some reason I can not figure it out.
>
> With a single R command complete the following:
> create a vector calles seqvec that repeats the sequence 1, 3,6, 10,15,21.( I
> was trying to use c() but this does not work)
> create a 5-row, 6-column matirx from seqvec wuth each row containg the
> sequence from before
> and complete the two task above in a single step.
>
> LTR
Is this what you want?
seqvec <- cumsum(1:6)
> seqvec
[1] 1 3 6 10 15 21
Or to address both:
> matrix(rep(cumsum(1:6), 5), ncol = 6, byrow = TRUE)
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 3 6 10 15 21
[2,] 1 3 6 10 15 21
[3,] 1 3 6 10 15 21
[4,] 1 3 6 10 15 21
[5,] 1 3 6 10 15 21
See ?cumsum and ?rep
HTH,
Marc Schwartz
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