## Parametric Curves

This program can be used to plot curves that are not determined by an explicit function term, but by two functions for the horizontal and vertical direction.

### Examples:

1. The Circle

x(k) = sin(k)

y(k) = cos(k)

k from -Pi to Pi

2. The Squircle

x(k) = sgn(cos(k))*abs(cos(k))^0,5

y(k) = sgn(sin(k))*abs(sin(k))^0,5

k from -Pi to Pi

3. The Spirale

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

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

k from 0 to 20

4. 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