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title: contour author: Darwin Darakananda part: Geometry order: 1015 ...

Draw contours of a 2D function or a matrix.

Aesthetics

  • z: 2D function or a matrix that represent "heights" relative to to the x-y plane.
  • x (optional): Vector of X-coordinates. If z is a matrix, then the length of x must be equal to the number of rows in z.
  • y (optional): Vector of Y-coordinates. If z is a matrix, then the length of y must be equal to the number of columns in z.

Arguments

  • levels (optional): Sets the number of contours to draw, defaults to 15. It takes either a vector of contour levels, or a integer that specifies the number of contours to draw.

Examples

using RDatasets
using Gadfly

Gadfly.set_default_plot_size(14cm, 8cm)

plot(z=(x,y) -> x*exp(-(x-int(x))^2-y^2),
     x=linspace(-8,8,150), y=linspace(-2,2,150), Geom.contour)
volcano = float(array(dataset("datasets", "volcano")))
plot(z=volcano, Geom.contour)
plot(z=volcano, Geom.contour(levels=[110.0, 150.0, 180.0, 190.0]))
plot(z=volcano, x=[0.0:10:860.0], y=[0.0:10:600.0], Geom.contour(levels=2))