pljoin: Draw a line between two points

`pljoin`: Draw a line between two points
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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 and 14.

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