## Parametric Curves

Curves, which are not determined by an explicit function term, but by two functions for the horizontal and vertical direction, can be plotted with this program.

### Examples:

1. The Circle

x(k) = sin(k)

y(k) = cos(k)

k from -Pi to Pi

2. The Spirale

x(k) = k/8*sin(k)

y(k) = k/8*cos(k)

k from 0 to 20

3. The Lissajou figures

x(k) = sin(3*k)

y(k) = cos(5*k)

k from -Pi to Pi

Lissajou figures are obtained when two a-c voltages with different frequencies are applied to an oscilloscope.

### See also:

Supported FunctionsSetting the graphics

Wikipedia: Parametric equation | Lissajous curve