All the plots in this chapter up to now have implicitly used rectangular coordinates, usually denoted as* x* and* y*. For certain types of information, however, polar geometry is the natural coordinate system. In polar coordinates we have a radius,` r`

, measured from the origin, usually at the center of the graph, and an angle,` θ`

, usually measured counter-clockwise from the horizontal. On the gnuplot command line, the angular coordinate is called` t`

by default. The following is an example of a spiral illustration:

Using polar coordinates we can plot spirals and closed curves that are impossible to define explicitly using ...

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