Passing the Function as a Character Vector or String

Array multiplication, division, and exponentiation are always implied in the expression you pass toezcontourf。例如,MATLAB^®syntax for a filled contour plot of the expression

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

is written as

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

That is,x^2is interpreted asx.^2in the character vector or string you pass toezcontourf。

If the function to be plotted is a function of the variablesuandv(rather thanxandy), then the domain endpointsumin,umax,vmin, andvmaxare sorted alphabetically. Thus,ezcontourf('u^2 - v^3',[0,1],[3,6])plots the contour lines foru²-v³over 0 <u< 1, 3 <v< 6.

Passing a Function Handle

Function handle arguments must point to functions that use MATLAB syntax. For example, the following statements define an anonymous function and pass the function handlefhtoezcontourf。

fh = @(x,y) sqrt(x.^2 + y.^2); ezcontourf(fh)

When using function handles, you must use the array power, array multiplication, and array division operators (。^, .*, ./) sinceezcontourfdoes not alter the syntax, as in the case with character vector or string inputs.

Passing Additional Arguments

If your function has additional parameters, for example,kinmyfun:

function z = myfun(x,y,k) z = x.^k - y.^k - 1;

那你这n use an anonymous function to specify that parameter:

ezcontourf(@(x,y)myfun(x,y,2))