not so FAQ

• Legend
• Tics
• Label
• 2-D Plot
• 3-D Plot
  • 
    origin of Z-axis

  • 
    fine mesh

  • 
    view point

  • 
    contours

  • 
    contours on the 2D plot

  • 
    3D grid graph

  • 
    colored 3D figure
    [ver.4]

  • 
    colors for contours
    [ver.4]

  • 
    pseudo 3D bar

  • 
    change 3D colors
    [ver.4]
• Polar Coordinate
• Parametric Functions
• Data File
• After Plotting
• Miscellaneous Stuff

About 3-Dimensional Plot (No.2)

How do I draw a 3-dim. grid graph from 3-Dim scattered data

Suppose your data to be plotted are 3-dimensinonal scattered data
(x,y,z) with arbitrary order. With the splot command,
gnuplot generates points or lines in a 3-dim. space.

# X          Y         Z
9.862e-01 -8.062e-02   0.001
9.786e-01 -1.134e-01   0.002
9.720e-01 -1.382e-01   0.003
.....
-1.849e-01 -2.165e-01  80.000
-2.412e-01 -1.301e-01  90.000
-2.611e-01 -4.825e-02 100.000

gnuplot> set xrange [-1:1]
gnuplot> set yrange [-1:1]
gnuplot> set ticslevel 0
gnuplot> splot "datafile.dat" u 1:2:3 with lines

In order to generate a 3-dim. grid graph from those data, use
set dgrid3d. Height of each mesh is determined
automatically by a weighted average of the data inside the grid.
The number of mesh in the X- and Y-directions can be specified by
set dgrid3d x-mesh, y-mash.

gnuplot> set dgrid3d 30,30
gnuplot> set hidden3d
gnuplot> splot "datafile.dat" u 1:2:3 with lines