Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Group: Plot Manipulation
See also: contour3

Function: contour2
Description: Computes lines and points for a contourplot of a three-dimensional dataset at level c.

Usage: {lt, pt} = contour2(x, c)
Input:
x n x 3 matrix containing (sorted) data
c scalar, defining the level at which cutting takes place
Output:
lt m1 x 2 matrix representing the lines of the contour plot
pt m2 x 2 matrix representing the points of the contour plot

Note:

Example:
x = grid(-#(3,3), #(0.25,0.25), #(25,25))
f = exp(-0.5.*sum(x^2,2))./(2.*pi)
z = sort(x~f, #(1,2,3))
{lt,pt} = contour2(z, max(f)./2)
d = createdisplay(1,1)
show(d,1,1,pt)

Result:
The two-dimensional cut through the function f is
shown in the display window. It has a form of a circle.



(C) MD*TECH Method and Data Technologies, 05.02.2006