contour#

Purpose#

Graphs a matrix of contour data.

Note

This function is for the deprecated PQG graphics.

Library#

pgraph

Format#

contour(x, y, z)#

Parameters:

x (1xK vector) – the X axis data. K must be odd.
y (Nx1 vector) – the Y axis data. N must be odd.
z (NxK matrix) – the matrix of height data to be plotted.

Global Input#

_plev#: Kx1 vector, user-defined contour levels for contour. Default 0.

_pzclr#: Nx1 or Nx2 vector. This controls the Z level colors. See surface() for a complete description of how to set this global.

Remarks#

A vector of evenly spaced contour levels will be generated automatically from the z matrix data. Each contour level will be labeled. For unlabeled contours, use ztics().

To specify a vector of your own unequal contour levels, set the vector _plev before calling contour().

To specify your own evenly spaced contour levels, see ztics().

Example#

// Create a contour plot of z = x^2 + y^2
x = seqa(-3, 0.5, 13);
y = seqa(-3, 0.5, 13);
z = x' .*. ones(13, 1);
z = z .* z + (ones(1, 13) .*. y) .* (ones(1, 13) .*. y);
contour(x', y, z);

Source#

pcontour.src