plsurf3dl: Plot shaded 3-d surface plot for z[x][y] with y index limits

`plsurf3dl`: Plot shaded 3-d surface plot for z[x][y] with y index limits
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#### `plsurf3dl`: Plot shaded 3-d surface plot for z[x][y] with y index limits

`plsurf3dl (` | x ,
| y ,
| z ,
| nx ,
| ny ,
| opt ,
| clevel ,
| nlevel ,
| indexxmin ,
| indexxmax ,
| indexymin ,
| indexymax `)`;

This variant of `plsurf3d` (see that function's documentation for more details) should be suitable for the case where the area of the ``x``, ``y`` coordinate grid where ``z`` is defined can be non-rectangular. The limits of that grid are provided by the parameters ``indexxmin``, ``indexxmax``, ``indexymin``, and ``indexymax``.

`x` (``PLFLT_VECTOR``, input)

  A vector containing the x coordinates at which the function is evaluated.

`y` (``PLFLT_VECTOR``, input)

  A vector containing the y coordinates at which the function is evaluated.

`z` (``PLFLT_MATRIX``, input)

  A matrix containing function values to plot. Should have dimensions of `nx` by `ny`.

`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. FACETED + SURF_CONT

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

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

  - ``opt`=SURF_CONT` : A contour plot is drawn at the surface plane using parameters `nlevel` and `clevel`.

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

  - ``opt`=MAG_COLOR` : the surface is colored according to the value of Z; if `MAG_COLOR` is not used, then the surface is colored according to the intensity of the reflected light in the surface from a light source whose position is set using `pllightsource`.

`clevel` (``PLFLT_VECTOR``, input)

  A vector containing the contour levels.

`nlevel` (``PLINT``, input)

  Number of elements in the `clevel` vector.

`indexxmin` (``PLINT``, input)

  The index value (which must be ≥ 0) that corresponds to the first ``x`` index where ``z`` is defined.

`indexxmax` (``PLINT``, input)

  The index value (which must be ≤ ``nx`` ) which corresponds (by convention) to one more than the last ``x`` index value where ``z`` is defined.

`indexymin` (``PLINT_VECTOR``, input)

  A vector containing the ``y`` index values which all must be ≥ 0. These values are the first ``y`` index where ``z`` is defined for a particular ``x`` index in the range from ``indexxmin`` to ``indexxmax - 1``. The dimension of ``indexymin`` is ``indexxmax``.

`indexymax` (``PLINT_VECTOR``, input)

  A vector containing the ``y`` index values which all must be ≤ ``ny``. These values correspond (by convention) to one more than the last ``y`` index where ``z`` is defined for a particular ``x`` index in the range from ``indexxmin`` to ``indexxmax - 1``. The dimension of ``indexymax`` is ``indexxmax``.

Redacted form: `plsurf3dl(x, y, z, opt, clevel, indexxmin, indexymin, indexymax)`

This function is used in example 8.

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