contour(Z)contour(Z,n)contour(Z,v)contour(x,y,Z)contour(x,y,Z,n)contour(x,y,Z,v)C = contour(...)
contour(Z) draws a contour plot of matrix Z. The contours are level lines in the units of array Z. The lower-left corner of the plot corresponds to Z(1,1). The number of contour lines and their values are chosen automatically by contour.
contour(Z,n) produces a contour plot of matrix Z with n contour levels.
contour(Z,v) draws a contour plot of Z with contour levels at the values specified in vector v.
contour(x,y,Z), contour(x,y,Z,n), and contour(x,y,Z,v) produce contour plots of Z and use the data in vectors x and y to control the axis scaling on the x- and y-axes. The elements of x and y are equally spaced.
C = contour(...) returns the contour matrix C as described in the function contourc and used by clabel.
To label the levels of a contour plot, see clabel.
over the range -2 <= x <= 2, -2 <= y <= 3, use the statements:
x = -2:.2:2;y = -2:.2:3;[X,Y] = meshgrid(x,y);Z = X.*exp(-X.^2-Y.^2);contour(x,y,Z)
Z is less than 2:
Matrix must be 2-by-2 or larger.
contour assumes that vectors x and y are monotonically increasing. If x and y are irregularly spaced, the contours are simply stretched apart, which is not the same as contouring the irregularly spaced data.
clabel,contour3,contourc,quiver
(c) Copyright 1994 by The MathWorks, Inc.