# plot3d.3plplot man page

**plot3d** — Plot 3-d surface plot

## Synopsis

**plot3d**(*x*, *y*, *z*, *nx*, *ny*, *opt*, *side*)

## Description

Plots a three dimensional surface plot within the environment set up by **plw3d**(3plplot). 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 PLplot documentation. The only difference between **plmesh**(3plplot) and **plot3d**(3plplot) is that **plmesh**(3plplot) draws the bottom side of the surface, while **plot3d**(3plplot) only draws the surface as viewed from the top.

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

This function is used in examples 11,21.

## 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:
*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.

## 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….