pljoin: Draw a line between two points

The PLplot Plotting Library: Programmer's Reference Manual
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### `pljoin`: Draw a line between two points

`pljoin` (x1, y1, x2, y2);

Joins the point `(`x1`, `y1`)` to `(`x2`, `y2`)`.

`x1` (`PLFLT`, input) x coordinate of first point. `y1` (`PLFLT`, input) y coordinate of first point. `x2` (`PLFLT`, input) x coordinate of second point. `y2` (`PLFLT`, input) y coordinate of second point.

Redacted form: `pljoin(x1,y1,x2,y2)`

This function is used in examples 3,14.

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