Symbolic Math Toolbox™

ezplot - Function plotter

Syntax

ezplot(f)
ezplot(f,[xmin xmax])
ezplot(f,[xmin xmax],fign)
ezplot(f,[xmin,xmax,ymin,ymax])
ezplot(x,y)
ezplot(x,y,[tmin,tmax])
ezplot(...,figure)

Description

ezplot(f) plots the expression f = f(x) over the default domain –2π < x < 2π.

ezplot(f,[xmin xmax]) plots f = f(x) over the specified domain. It opens and displays the result in a window labeled Figure No. 1. If any plot windows are already open, ezplot displays the result in the highest numbered window.

ezplot(f,[xmin xmax],fign) opens (if necessary) and displays the plot in the window labeled fign.

For implicitly defined functions, f = f(x,y).

ezplot(f) plots f(x,y) = 0 over the default domain –2π < x < 2π, –2π < y < 2π.

ezplot(f,[xmin,xmax,ymin,ymax]) plots f(x,y) = 0 over xmin < x < xmax and ymin < y < ymax.

ezplot(f,[min,max])plots f(x,y) = 0 over min < x < max and 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, ezplot(u^2 - v^2 - 1,[-3,2,-2,3]) plots u² – v² – 1 =  0 over –3 < u < 2, –2 < v < 3.

ezplot(x,y) plots the parametrically defined planar curve x = x(t) and y = y(t) over the default domain 0 < t < 2π.

ezplot(x,y,[tmin,tmax]) plots x = x(t) and y = y(t) over tmin < t < tmax.

ezplot(...,figure) plots the given function over the specified domain in the figure window identified by the handle figure.

Algorithm

If you do not specify a plot range, ezplot samples the function between -2*pi and 2*pi and selects a subinterval where the variation is significant as the plot domain. For the range, ezplot omits extreme values associated with singularities.

Examples

This example plots the implicitly defined function,

x² - y⁴ = 0

over the domain [–2π, 2π].

syms x y
ezplot(x^2-y^4)

The following statements

syms x
ezplot(erf(x))
grid

plot a graph of the error function.

See Also

ezcontour, ezcontourf, ezmesh, ezmeshc, ezplot3, ezpolar, ezsurf, ezsurfc, plot

ezmeshc

ezplot3