3D Plotting in Matlab

Given two vectors describing sequences of x and y values, e.g.

x=[1:.1:10]

y=[-1: .01 : 1]

the command

[X,Y]=meshgrid(x,y)

constructs two length(x) by length(y) matrices.

The matrix X has the i'th value of vector x in its i'th column.

The matrix Y has the j'th value of vector y in its j'th row.

If the function f(x,y) is described in an m-file fcnname.m, then

Z=fcnanme(X,Y)

will compute an appropriate array of function values so that

mesh(x,y,Z)

gives a wireframe graph of f

meshc(x,y,Z)

gives a graph with contours drawn in the xy plane.

surf(x,y,Z)

gives a shaded surface representing this graph.

Last Update: September 25, 2000

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