There are three
gnuplot commands which actually create a plot:
plot generates 2-d plots,
splot generates 3-d
plots (actually 2-d projections, of course), and
replot appends its
arguments to the previous
splot and executes the modified
Much of the general information about plotting can be found in the discussion
plot; information specific to 3-d can be found in the
plot operates in either rectangular or polar coordinates -- see
for details of the latter.
splot operates only in rectangular coordinates,
set mapping command allows for a few other coordinate systems to be
treated. In addition, the
using option allows both
treat almost any coordinate system you'd care to define.
splot can plot surfaces and contours in addition to points and/or lines.
In addition to
set isosamples for information about defining
the grid for a 3-d function;
splot datafile for information about the
requisite file structure for 3-d data values; and
set contour and `set
cntrparam` for information about contours.