[R] stuff I used to do in Matlab

[Timothy Bock]

> 	I'm new to R, and trying to map stuff I knew how to do in Matlab
> to R. For instances, in matlab, sum(x) gave the column sums of
> matrix(/vector) x. 


#column sums
margin.table(x,2)
# or
apply(z,2,sum)

> concatenating a matrix onto the end or 
> the bottom of
> another matrix (i.e. horiz or vertically) but no such 
> operators seem to
> exist for R. is there an easy way to concatenate matrices? 

# horizontally
cbind(x1,x2)
# vertically
rbind(x1,x2)

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