plgdiplt: Get parameters that define current plot-space window

`plgdiplt`: Get parameters that define current plot-space window
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#### `plgdiplt`: Get parameters that define current plot-space window

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

Get relative minima and maxima that define current plot-space window. If `plsdiplt` has not been called the default values pointed to by ``p_xmin``, ``p_ymin``, ``p_xmax``, and ``p_ymax`` will be 0., 0., 1., and 1.

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

  Returned value of the relative minimum in x.

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

  Returned value of the relative minimum in y.

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

  Returned value of the relative maximum in x.

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

  Returned value of the relative maximum in y.

Redacted form: `plgdiplt(p_xmin, p_ymin, p_xmax, p_ymax)`

This function is used in example 31.

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