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