Trying to change colors of the representation on the graph, and I get an error that I don't understand.
set.seed(12) df <- expand.grid( x = 0:10 , y = 0:10 ) %>% as.data.frame() %>% bind_cols(data.frame(z = rnorm(121,0,1))) ggplot(df, aes( x=x, y=y, z=z)) + geom_contour_filled() ggplot(df, aes( x=x, y=y, z=z)) + geom_contour_filled() + scale_fill_gradient(low = "blue", high = "red", na.value = NA)
The first graph appears normally. The second graph says
Error: Discrete value supplied to continuous scale. scale_color_gradient throws no error but it also doesn't change the colors of the graph any.