Disable more examples because winbuilder is so slow

Author: jeroen

R/fx.R

@@ -14,18 +14,18 @@
 #' @family image
 #' @param expression string with an [fx expression](https://www.imagemagick.org/script/fx.php)
 #' @examples # Show image_fx() expression
-#' if(magick_config()$version > "6.8.8"){
 #' img <- image_convert(logo, colorspace = "Gray")
-#' image_fx(img, expression = "pow(p, 0.5)")
-#' #image_fx(img, expression = "rand()")
-#'
 #' gradient_x <- image_convolve(img, kernel = "Prewitt")
 #' gradient_y <- image_convolve(img, kernel = "Prewitt:90")
 #' gradient <- c(image_fx(gradient_x, expression = "p^2"),
 #'                 image_fx(gradient_y, expression = "p^2"))
 #' gradient <- image_flatten(gradient, operator = "Plus")
 #' #gradient <- image_fx(gradient, expression = "sqrt(p)")
 #' gradient
+#'
+#' \donttest{
+#' image_fx(img, expression = "pow(p, 0.5)")
+#' image_fx(img, expression = "rand()")
 #' }
 image_fx <- function(image, expression = "p", channel = NULL){
   assert_image(image)