MATLAB Function Reference

ezsurfc

Easy to use combination surface/contour plotter

Syntax

ezsurfc(f)
ezsurfc(f,domain)
ezsurfc(x,y,z)
ezsurfc(x,y,z,[smin,smax,tmin,tmax]) or ezsurfc(x,y,z,[min,max])
ezsurfc(...,n)
ezsurfc(...,'circ')

Description

ezsurfc(f) creates a graph of f(x,y), where f is a string that represents a mathematical function of two variables, such as x and y.

The function f is plotted over the default domain: -2 < x < 2, -2 < y < 2. MATLAB chooses the computational grid according to the amount of variation that occurs; if the function f is not defined (singular) for points on the grid, then these points are not plotted.

ezsurfc(f,domain) plots f over the specified domain. domain can be either a 4-by-1 vector [xmin, xmax, ymin, ymax] or a 2-by-1 vector [min, max] (where, min < x < max, min < y < max).

If f is a function of the variables u and v (rather than x and y), then the domain endpoints umin, umax, vmin, and vmax are sorted alphabetically. Thus, ezsurfc('u^2 - v^3',[0,1],[3,6]) plots u² - v³ over 0 < u < 1, 3 < v < 6.

ezsurfc(x,y,z) plots the parametric surface x = x(s,t), y = y(s,t), and z = z(s,t) over the square: -2 < s < 2, -2 < t < 2.

ezsurfc(x,y,z,[smin,smax,tmin,tmax]) or ezsurfc(x,y,z,[min,max]) plots the parametric surface using the specified domain.

ezsurfc(...,n) plots f over the default domain using an n-by-n grid. The default value for n is 60.

ezsurfc(...,'circ') plots f over a disk centered on the domain.

Remarks

rotate3d is always on. To rotate the graph, click and drag with the mouse.

Array multiplication, division, and exponentiation are always implied in the expression you pass to ezsurfc. For example, the MATLAB syntax for a surface/contour plot of the experssion,

sqrt(x.^2 + y.^2);

is written as:

ezsurfc('sqrt(x^2 + y^2)')

That is, x^2 is interpreted as x.^2 in the string you pass to ezsurfc.

Examples

Create a surface/contour plot of the expression,

over the domain -5 < x < 5, -2*pi < y < 2*pi, with a computational grid of size 35-by-35:

ezsurfc('y/(1 + x^2 + y^2)',[-5,5,-2*pi,2*pi],35)

Use the mouse to rotate the axes to better observe the contour lines (this picture uses a view of azimuth = -65.5 and elevation = 26)

See Also

ezcontour, ezcontourf, ezmesh, ezmeshc, ezplot, ezpolar, ezsurf, surfc

ezsurf

factor