I am using the
plotly package in R to draw a surface plot and a contour plot:
# Load package library(plotly) # Simulate the data for plotting x <- y <- seq(from = 0, to = 100, by = 1) z1 <- outer(X = x, Y = y, FUN = function(x, y) x^0.2 * y^0.3) # data for surface plot # Draw surface plot (3D) plotly::plot_ly(z = z1) %>% plotly::add_surface( contours = list( z = list( show = TRUE, usecolormap = TRUE, highlightcolor = "#ff0000", project = list(z = TRUE) ) ) ) # Draw contour plot (2D) plot_ly(z = z1) %>% add_contour()
The rendering of the two plots contains contour lines, which show the combinations of
y that yield a constant
z level. In the case of the 3D surface plot, hovering the mouse over it dynamically draws a contour line where the mouse is with a projection of the contour line on one of the sides of the 3-dimensional space.
What I would like to do is to manually draw one or multiple contour lines on the two plots by specifying a value for
z myself (e.g.
z = 5).