plsurf3d: Plot shaded 3-d surface plot
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plsurf3d: Plot shaded 3-d surface plot

plsurf3d ( x ,
  y ,
  z ,
  nx ,
  ny ,
  opt ,
  clevel ,
  nlevel );
 

Plots a three-dimensional shaded surface plot within the environment set up by plw3d. The surface is defined by the two-dimensional 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. For further details see the section called “Three-dimensional Plots”.

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.

Redacted form: plsurf3d(x, y, z, opt, clevel)

This function is not used in any examples.

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