#' Named transformation functions
#'
#' Evaluates the named link function at the locations \code{x}.
#'
#' @importFrom stats qlogis
#'
#' @param x Values at which to evaluate the link function
#' @param link Character vector specifying link function to evaluate. Supports
#' \code{'identity'}, \code{'log'}, and \code{'logit'}.
#' @param linkparams Optional list of additional parameters for link functions.
#' For example, the logit function can be extended to allow mappings to any
#' closed interval. There should be one list entry for each link function.
#' Specify NA if defaults should be used.
#'
#' @export
#'
#' @examples
#' bisque:::tx(0.5, 'logit', list(NA))
#'
tx = function(x, link, linkparams) {
# function to apply link transformations
for(i in 1:length(link)) {
x[i] = switch (link[i],
'identity' = x[i],
'log' = log(x[i]),
'logit' = {
range = linkparams[[i]]
if(any(is.na(range))) {
range = c(0,1)
}
qlogis((x[i] - range[1])/diff(range))
}
)
}
x
}
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