Gnuplot can graph functions whose* x* and* y* values depend on a third variable, called a** parameter**. In this way, more complicated curves can be drawn. The following plot resembles a lissajous figure, which can be seen on an oscilloscope when sine waves of different frequencies are controlling the* x* and* y* axes:

The following script creates the previous figure:

```
set samples 1000
```**set parametric**
plot sin(7*t), cos(11*t) notitle

We want more samples than the default 100 for a smoother plot, hence the first line. The second line (highlighted) changes the way gnuplot interprets plot commands; now the two ...

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