[R] Vector- matrix arithmatic

[Laurent Gautier]

Peter Ho wrote:

> Hi,
>
> I have a matrix X of nrow=64 and ncol=5 and 2 vectors a and b both of length=5. I
> want to find
> the values for Y = a + (X-b) such that the operation of X is done by rows and not
> by columns.

Try

Y _ a + ( t(X) - b )

It should do it...



Laurent


PS : I wonder what kind of elegant solution the R-masters will give this time : I
particularly appreciated the dim(Z) _ NULL recently mentionned....

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