Nothing
"spatialSign" <- function(x) UseMethod("spatialSign")
"spatialSign.default" <- function(x)
{
if(is.character(x) | is.factor(x)) stop("spatial sign is not defined for character or factor data")
denom <- sum(x^2)
out <- if(sqrt(denom) > .Machine$double.eps) x / sqrt(denom) else x * 0
out
}
"spatialSign.matrix" <- function(x)
{
# check for character data
if(is.character(x)) stop("spatial sign is not defined for character data")
xNames <- dimnames(x)
p <- ncol(x)
tmp <- t(apply(x, 1, spatialSign.default))
if(p == 1 & nrow(tmp) == 1) tmp <- t(tmp)
dimnames(tmp) <- xNames
tmp
}
"spatialSign.data.frame" <- function(x)
{
if(any(apply(x, 2, function(data) is.character(data) | is.factor(data))))
stop("spatial sign is not defined for character or factor data")
xNames <- dimnames(x)
x <- as.matrix(x)
if(!is.numeric(x)) stop("a character matrix was the result of as.matrix")
tmp <- spatialSign(x)
dimnames(tmp) <- xNames
tmp
}
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