I think that is because X in your function has (n + 1) columns and D with
only n coluimns:
matrix(1:9, ncol = 3) + matrix(1:8, ncol = 2)
On Tue, Jul 7, 2009 at 2:30 PM, spime <saby...@gmail.com> wrote:
>
> Hello,
>
> Consider this function for generalized ridge regression:
>
> gre <- function (X,y,D){
> n <- dim(X)[1]
> p <- dim(X)[2]
> intercept <- rep(1, n)
> X <- cbind(intercept, X)
> X2D <- crossprod(X,X)+ D
> Xy <- crossprod(X,y)
> bth <- qr.solve(X2D, Xy)
> }
>
> # suppose X is an (nxp) design matrix and y is an (nx1) response vector
> p <- dim(x)[2]
> D<- diag(rep(1.5,p))
> bt <- gre(X,y,D)
>
> I am getting following error:
> Error in crossprod(X, X) + D : non-conformable arrays
>
> But when i define D within the function 'gre()' then everything is fine.
> What wrong i have done?
>
> thanks.
> --
> View this message in context:
> http://www.nabble.com/Error-due-to-non-conformable-arrays-tp24377781p24377781.html
> Sent from the R help mailing list archive at Nabble.com.
>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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