plshade: Shade individual region on the basis of value

The PLplot Plotting Library: Programmer's Reference Manual
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### `plshade`: Shade individual region on the basis of value

`plshade` (a, nx, ny, defined, xmin, xmax, ymin, ymax, shade_min, shade_max, sh_cmap, sh_color, sh_width, min_color, min_width, max_color, max_width, fill, rectangular, pltr, pltr_data);

Shade individual region on the basis of value. Use `plshades` if you want to shade a number of regions using continuous colors. `plshade` is identical to `plshade1` except for the type of the first parameter. See `plshade1` for further discussion.

`a` (`PLFLT **`, input) `nx` (`PLINT`, input) `ny` (`PLINT`, input) `defined` (`PLINT (*) (PLFLT, PLFLT)`, input) `xmin` (`PLFLT`, input) `xmax` (`PLFLT`, input) `ymin` (`PLFLT`, input) `ymax` (`PLFLT`, input) `shade_min` (`PLFLT`, input) `shade_max` (`PLFLT`, input) `sh_cmap` (`PLINT`, input) `sh_color` (`PLFLT`, input) `sh_width` (`PLINT`, input) `min_color` (`PLINT`, input) `min_width` (`PLINT`, input) `max_color` (`PLINT`, input) `max_width` (`PLINT`, input) `fill` (`void (*) (PLINT, PLFLT *, PLFLT *)`, input) `rectangular` (`PLBOOL`, input) `pltr` (`void (*) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer)` , input) `pltr_data` (`PLPointer`, input)

Redacted form:

- General: `plshade(a, defined, xmin, xmax, ymin, ymax, shade_min, shade_max, sh_cmap, sh_color, sh_width, min_color, min_width, max_color, max_width, fill, rectangular, pltr, pltr_data)`

- Perl/PDL: Not available?

This function is used in example 15.

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