Re: Accessing Matrix library with S+ 6.1 for windows

[Sundar Dorai-Raj <sundar.dorai-raj@pdf.com>]

Jean V Adams wrote:
> I'm using S-PLUS 6.1 for Windows Prof. Ed. Rel. 1, and the module S+ 6
> SpatialStats for Windows.  I get an error message, shown below, when I try
> to access the function is.Hermitian() from the library Matrix.  I see from
> the release notes on-line that the Matrix library is missing from this
> release.  How can I access the Matrix library functions?
>
> library(Matrix)
> Problem in library(Matrix): No section "Matrix" in the library directory:
> C:/PROGRAM FILES/INSIGHTFUL/splus61\library
> Use traceback() to see the call stack
>
> is.Hermitian(spatial.weights(W.CAR), tol=0)
> Problem: Couldn't find a function definition for "is.Hermitian"
> Use traceback() to see the call stack
As you have already determined, there is no `Matrix' library for S-PLUS 
6.1. If all you need is `is.Hermitian' then you can get this from the R 
`Matrix' package:
is.Hermitian <- function (x, tol = 0) {
    Hermitian.test(x) <= tol
}
Hermitian.test <- function (x) {
    if (!is.matrix(x) || (nrow(x) != ncol(x)))
        return(Inf)
    if (is.complex(x))
        return(max(Mod(x - t(Conj(x)))))
    max(x - t(x))
}

Sundar