plgvpw: Get viewport limits in world coordinates

`plgvpw`: Get viewport limits in world coordinates
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#### `plgvpw`: Get viewport limits in world coordinates

`plgvpw (` | p_xmin,
| p_xmax,
| p_ymin,
| p_ymax`)`;

Get viewport limits in world coordinates.

`p_xmin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the lower viewport limit of the world coordinate in x.

`p_xmax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the upper viewport limit of the world coordinate in x.

`p_ymin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the lower viewport limit of the world coordinate in y.

`p_ymax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the upper viewport limit of the world coordinate in y.

Redacted form:

- General: `plgvpw(p_xmin, p_xmax, p_ymin, p_ymax)`

- Perl/PDL: Not available?

This function is used in example 31.

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