[R] / Right division.
murdoch at stats.uwo.ca
Tue Jul 26 22:15:15 CEST 2005
On 7/26/2005 4:02 PM, nwew wrote:
> Dear R gurus.
> Is there an R function equivalent to octaves / (Right division)
> withouth forming the inverse of Y' using solve ?
> [snip - from octave docu]
> Right division. This is conceptually equivalent to the expression
> (inverse (y') * x')'
> but it is computed without forming the inverse of Y'.
> If the system is not square, or if the coefficient matrix is
> singular, a minimum norm solution is computed.
If x is a vector, I think it's solve(t(Y), x). If x is stored as a 1xn
matrix, you'd use t(solve(t(Y), t(x)).
If you're trying to do multiple operations at once, you probably need to
use the second form.
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