ezpolar (MATLAB Functions)

Easy to use polar coordinate plotter

Syntax

ezpolar(fun)
ezpolar(fun,[a,b])
ezpolar(axes_handle,...)
h = ezpolar(...)

Description

ezpolar(fun) plots the polar curve rho = fun(theta) over the default domain 0 < theta < 2.

fun can be a function handle for an M-file function or an anonymous function (see Function Handles and Anonymous Functions) or a string (see the Remarks section).

ezpolar(fun,[a,b]) plots fun for a < theta < b.

ezpolar(axes_handle,...) plots into the axes with handle axes_handle instead of the current axes (gca).

h = ezpolar(...) returns the handle to a line object in h.

Remarks

Passing the Function as a String

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

```
t.^2.*cos(t)
```

which represents an implicitly defined function, is written as

```
ezpolar('t^2*cos(t)')
```

That is, t^2 is interpreted as t.^2 in the string you pass to ezpolar.

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 handle fh to ezpolar.

```
fh = @(t) t.^2.*cos(t);
ezpolar(fh)
```

Note that when using function handles, you must use the array power, array multiplication, and array division operators (.^, .*, ./) since ezpolar does not alter the syntax, as in the case with string inputs.

Passing Additional Arguments

If your function has additional parameters, for example k1 and k2 in myfun:

function s = myfun(t,k1,k2)
s = sin(k1*t).*cos(k2*t);

then you can use an anonymous function to specify the parameters:

```
ezpolar(@(t)myfun(t,2,3))
```

Examples

This example creates a polar plot of the function

1 + cos(t)

over the domain [0, 2]:

```
ezpolar('1+cos(t)')
```

See Also

ezplot, ezplot3, function_handle, plot, plot3, polar

Function Plots for related functions

ezplot3 ezsurf