splot

Three-dimensional surface and contour plotting is available in GNUPLOT with the splot command. See the plot command for features common to the plot command.

See also set contour, set cntrparam, and set surface.

Binary Data

Gnuplot will dynamically determine if a datafile is ASCII or binary. ASCII data files are discussed in the plot section. For three dimensions, single precision floats are stored as follows:

     <ncols> <x0> <x1> <x2> ...
     <y0> <z0,0> <z0,1> <z0,2> ...
     <y1> <z1,0> <z1,1> <z1,2> ...

which is converted into triplet:

     <x0> <y0> <z0,0>
     <x0> <y1> <z0,1>
     <x0> <y2> <z0,2>

     <x1> <y0> <z1,0>
     <x1> <y1> <z1,1>
     <x1> <y2> <z1,2>

These triplets are then converted into gnuplot iso_curves and then uses gnuplot to do the rest of the plotting.

A collection of matrix and vector manipulation routines (in C) are provided in gnubin.c. The routine to write binary data is

int fwrite_matrix(file,m,nrl,nrl,ncl,nch,row_title,column_title)

An example of using these routines is provided in the file bf_test.c. The corresponding demo file is demo/binary.dem.

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