contour(x, y, z, level::Number) Trace a single contour level, indicated by the argument level.

You'll usually call lines on the output of contour, and then iterate over the result.

contours returns a set of isolines.

You'll usually call levels on the output of contours.

contours(x,y,z,levels) Trace the contour levels indicated by the levels argument.

contours(x,y,z,Nlevels::Integer) Trace Nlevels contour levels at heights chosen by the library (using the contourlevels function).

contours(x,y,z) Trace 10 automatically chosen contour levels.

level(c) Indicates the z-value at which the contour level c was traced.

Turns the output of contours into an iterable with each of the traced contour levels. Each of the objects support level and coordinates.

lines(c) Extracts an iterable collection of isolines from a contour level. Use coordinates to get the coordinates of a line.

coordinates(c) Returns the coordinates of the vertices of the contour line as a tuple of lists.

contourlevels(z,n) Examines the values of z and chooses n evenly spaced levels to trace.