plot3dc: Magnitude colored plot surface with contour

`plot3dc`: Magnitude colored plot surface with contour
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#### `plot3dc`: Magnitude colored plot surface with contour

`plot3dc (` | x,
| y,
| z,
| nx,
| ny,
| opt,
| clevel,
| nlevel`)`;

Aside from dropping the `side` functionality this is a more powerful form of ``plot3d``: the surface mesh can be colored accordingly to the current z value being plotted, a contour plot can be drawn at the base XY plane, and a curtain can be drawn between the plotted function border and the base XY plane. The arguments are identical to those of ``plmeshc``. The only difference between `plmeshc` and `plot3dc` is that `plmeshc` draws the bottom side of the surface, while `plot3dc` only draws the surface as viewed from the top.

`x` (`const PLFLT *`, input)

  Pointer to set of x coordinate values at which the function is evaluated.

`y` (`const PLFLT *`, input)

  Pointer to set of y coordinate values at which the function is evaluated.

`z` (`const PLFLT * const *`, input)

  Pointer to a vectored two-dimensional array with set of function values.

`nx` (`PLINT`, input)

  Number of ``x`` values at which function is evaluated.

`ny` (`PLINT`, input)

  Number of ``y`` values at which function is evaluated.

`opt` (`PLINT`, input)

  Determines the way in which the surface is represented. To specify more than one option just add the options, e.g. DRAW_LINEXY + MAG_COLOR

  - ``opt`=DRAW_LINEX`: Lines are drawn showing ``z`` as a function of ``x`` for each value of ``y`[j]`.

  - ``opt`=DRAW_LINEY`: Lines are drawn showing ``z`` as a function of ``y`` for each value of ``x`[i]`.

  - ``opt`=DRAW_LINEXY`: Network of lines is drawn connecting points at which function is defined.

  - ``opt`=MAG_COLOR`: Each line in the mesh is colored according to the z value being plotted. The color is used from the current color map 1.

  - ``opt`=BASE_CONT`: A contour plot is drawn at the base XY plane using parameters `nlevel` and `clevel`.

  - ``opt`=DRAW_SIDES`: draws a curtain between the base XY plane and the borders of the plotted function.

`clevel` (`const PLFLT *`, input)

  Pointer to the array that defines the contour level spacing.

`nlevel` (`PLINT`, input)

  Number of elements in the `clevel` array.

Redacted form:

- General: `plot3dc(x, y, z, opt, clevel)`

- Perl/PDL: Not available?

This function is used in example 21.

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`plot3d`: Plot 3-d surface plot | Home | `plot3dcl`: Magnitude colored plot surface with contour for z[x][y] with y index limits