The PLplot Plotting Library: Programmer's Reference Manual
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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 *`, output) Lower viewport limit of the world coordinate in x. `p_xmax` (`PLFLT *`, output) Upper viewport limit of the world coordinate in x. `p_ymin` (`PLFLT *`, output) Lower viewport limit of the world coordinate in y. `p_ymax` (`PLFLT *`, output) Upper viewport limit of the world coordinate in y.

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`plgvpd`: Get viewport limits in normalized device coordinates | Up | `plgxax`: Get x axis parameters