contour3
3-D contour plot
Syntax
contour3(Z)
contour3(Z,n)
contour3(Z,v)
contour3(X,Y,Z)
contour3(X,Y,Z,n)
contour3(X,Y,Z,v)
contour3(...,LineSpec)
contour3(...,Name,Value)
contour3(ax,...)
[C,h] = contour3(...)
Description
contour3 creates a 3-D contour plot of a
surface defined on a rectangular grid.
contour3(Z) draws a contour
plot of matrix Z in a 3-D view. Z is
interpreted as heights with respect to the x-y plane. Z must
be at least a 2-by-2 matrix that contains at least two different values.
The x values correspond to the column indices
of Z and the y values correspond
to the row indices of Z. The contour levels are
chosen automatically.
contour3(Z,n) draws a contour
plot of matrix Z with n contour
levels in a 3-D view.
contour3(Z,v) draws a contour
plot of matrix Z with contour lines at the values
specified in vector v. The number of contour levels
is equal to length(v). Specifying the vector v sets
the LevelListMode property to manual. To display
a single contour line at a particular value, define v as
a two-element vector with both elements equal to the desired contour
level. For example, to draw a single contour of level k,
use contour3(Z,[k k]).
contour3(X,Y,Z), contour3(X,Y,Z,n),
and contour3(X,Y,Z,v) draw contour plots of Z using X and Y to
determine the x and y values.
If
XandYare vectors, thenlength(X)must equalsize(Z,2)andlength(Y)must equalsize(Z,1). The vectors must be strictly increasing or strictly decreasing and cannot contain any repeated values.If
XandYare matrices, then their sizes must equal the size ofZ. Typically, you should setXandYso that the columns are strictly increasing or strictly decreasing and the rows are uniform (or the rows are strictly increasing or strictly decreasing and the columns are uniform).
If X or Y is
irregularly spaced, then contour3 calculates
contours using a regularly spaced contour grid, and then transforms
the data to X or Y.
contour3(...,LineSpec) draws
the contour lines using the line type and color specified by LineSpec. contour3 ignores
marker symbols.
contour3(...,Name,Value) specifies
contour properties using one or more property name, property value
pairs. Name is the property name and must appear
inside single quotes (''). Value is
the corresponding value. For example, 'LineWidth',2 sets
the contour line width to 2. For a list of contour property names
and values, see Contour Properties.
contour3(ax,...) plots
into the axes specified by ax instead of into the
current axes (gca).
[C,h] = contour3(...) returns
the contour matrix C containing the data that defines
the contour lines and the contour object h. The clabel function uses the contour matrix
to label the contour lines.
Examples
Create 3-D Contour Plot
Set up matrices X and Y using the meshgrid function. Plot 30 contours of matrix Z.
x = -2:0.25:2; [X,Y] = meshgrid(x); Z = X.*exp(-X.^2-Y.^2); contour3(X,Y,Z,30)
