# plsurf3dl.3plplot man page

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

## Synopsis

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

## Description

This variant of **plsurf3d**(3plplot) (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*.

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

This function is used in example 8.

## Arguments

*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. 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 default 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**(3plplot). *clevel*(const PLFLT *, input)- Pointer to the array that defines the contour level spacing.
*nlevel*(PLINT, input)- Number of elements in the clevel array.
*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*(const PLINT *, input)- Array of
*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*(const PLINT *, input)- Array of
*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*.

## Authors

Many developers (who are credited at http://plplot.sourceforge.net/credits.p…) have contributed to PLplot over its long history.

## See Also

PLplot documentation at http://plplot.sourceforge.net/documenta….