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#' plotSingleDimFunction
#'
#' Plot a single dimensional Function
#'
#' @param evalFun function to be plotted. The function should either be able to take two vectors or one matrix specifying sample locations. i.e. \code{z=f(X)} or \code{z=f(x2,x1)} where Z is a two column matrix containing the sample locations \code{x1} and \code{x2}.
#' @param lower boundary for x1 and x2 (defaults to \code{c(0,0)}).
#' @param upper boundary (defaults to \code{c(1,1)}).
#' @param target String, which type of uncertainty estimation should be plotted? default: NULL - no estimation plotted. 's' standard estimation. 'sLinear' linearly adapted estimation.
#'
#' @importFrom ggplot2 ggplot
#' @importFrom ggplot2 geom_line
#' @importFrom ggplot2 aes
#' @importFrom ggplot2 geom_ribbon
#'
#' @export
#' @keywords internal
plotSingleDimFunction <- function(evalFun, lower, upper, target){
force(evalFun)
x <- seq(lower, upper, length.out = 200)
withSE = F
if(is.null(target) | length(target) == 1){
y <- evalFun(x)
}else{
y <- evalFun(x)$y
if("s" %in% target){
withSE = T
s <- evalFun(x)$s
}
}
if(!withSE){
ggplot(data=data.frame(x,y), aes(x=x, y=y, group=1)) +
geom_line()
}else{
ggplot(data=data.frame(x,s), aes(x=x)) +
geom_line(aes(y = y)) +
geom_ribbon(aes(ymax=y + s, ymin=y - s), fill="pink", alpha=.5)
}
}
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