`plot3d`: Plot 3-d surface plot
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#### `plot3d`: Plot 3-d surface plot

`plot3d (` | x,
| y,
| z,
| nx,
| ny,
| opt,
| side`)`;

Plots a three dimensional surface plot within the environment set up by `plw3d`. The surface is defined by the two-dimensional array ``z`[`nx`][`ny`]`, the point ``z`[i][j]` being the value of the function at `(`x`[i], `y`[j])`. Note that the points in arrays ``x`` and ``y`` do not need to be equally spaced, but must be stored in ascending order. The parameter ``opt`` controls the way in which the surface is displayed. For further details see the section called “Three Dimensional Surface Plots”. The only difference between `plmesh` and `plot3d` is that `plmesh` draws the bottom side of the surface, while `plot3d` 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:

  - ``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.

`side` (`PLBOOL`, input)

  Flag to indicate whether or not ``sides'' should be draw on the figure. If ``side`` is true sides are drawn, otherwise no sides are drawn.

Redacted form: `plot3d(x, y, z, opt, side)`

This function is used in examples 11,21.

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