# plot3d.3plplot - Man Page

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 matrix *z*[*nx*][*ny*] , the point *z*[i][j] being the value of the function at (*x*[i],*y*[j]). Note that the points in vectors *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 and 21.

## Arguments

*x*(**PLFLT_VECTOR**(3plplot), input)A vector containing the x coordinates at which the function is evaluated.

*y*(**PLFLT_VECTOR**(3plplot), input)A vector containing the y coordinates at which the function is evaluated.

*z*(**PLFLT_MATRIX**(3plplot), input)A matrix containing function values to plot. Should have dimensions of

*nx*by*ny*.*nx*(**PLINT**(3plplot), input)Number of

*x*values at which function is evaluated.*ny*(**PLINT**(3plplot), input)Number of

*y*values at which function is evaluated.*opt*(**PLINT**(3plplot), 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**(3plplot), 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.org/credits.php) have contributed to PLplot over its long history.

## See Also

PLplot documentation at http://plplot.org/documentation.php.