https://github.com/cran/pracma
Tip revision: a850b1ad48fcaac7a21cb289147c932e23b23acb authored by HwB on 15 July 2011, 00:00:00 UTC
version 0.7-3
version 0.7-3
Tip revision: a850b1a
inv.R
##
## i n v . R matrix inverse
##
inv <- function(a) {
if (length(a) == 0) return(matrix(0, nrow=0, ncol=0))
if ((!is.numeric(a) && !is.complex(a)) || !is.matrix(a))
stop("Argument 'a' must be a numeric or complex matrix.")
if (nrow(a) != ncol(a))
stop("Matrix 'a' must be square.")
e <- try(b <- solve(a), silent=TRUE)
if (class(e) == "try-error") {
warning("Matrix appears to be singular.")
b <- rep(Inf, length(a))
dim(b) <- dim(a)
}
return(b)
}