Plot points in 3d gnuplot manual

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Gnuplot draws 3D figures with lines and / or points, in addition, ver.3.8 or 4.0 allows you to draw a color-mapped 3D figure by setting pm3d . The figure is shown on your screen as well as PostScript or some image formats like PNG/JPG.
Three-Dimensional Plots with Gnuplot This is a brief introduction by example to making plots of three-dimensional (3-d) surfaces and data with the GNUPLOT plotting program. You’ll want to start up GNUPLOT (by typing ‘gnuplot’) and follow along. The basic command for 3-d plots (that is, projections
In order to place this two dimensional function in our 3D plot we use the special-filenames property from Gnuplot, in this case the ‘+’ variant. This tells Gnuplot to use the xrange, apply a sampling of it and return it as first column for the plot command.
It can plot curves in the plane or in 3D projection, This, in command line mode or from a script file. It can also plot curves from data files provided by data acquisition systems. Simple to use and efficient it will satisfy many scientific, professionnal or education oriented users. Gnuplot runs under Linux, but also under BeOS and some other systems. Its current version is 4.0 . Preface
The homepage is gnuplot.sourceforge.net, and a detailed manual for the latest release is also available. Gnuplot is also readily scriptable. This allows you, for example, to incorporate it into a bash script to automatically produce a file containing a plot of your results after your calculation has finished.
Plotting 3D points; Saving to Files; Common operations; The plotting package currently uses gnuplot as a backend to display data. In particular, Gnuplot version 4.4 or above is suggested for full support of all functionality. By default, the plot package will search for terminal in following order: windows terminal if operating system is windows Visualization Of 3D Data. The application program of choice is GNUplot. To demonstrate how to use gnuplot, we will give an example. The example will be to create a three dimensional plot of the Breit-Wigner T-matrix:
I want to draw only contours on the 2-dimensional plot. When your view point is right above the XY plane, you get a two-dimensional plot of the contours lines. Firstly set the view point at 0,0 by set view 0,0 , and indicate set nosurface to hide the surface. gnuplot> set contour base gnuplot> set nosurface gnuplot> set view 0,0
In our example we don’t want to plot from a data fle, however. We want to plot a function given directly in the script. This presents us with a problem, as gnuplot does not support cylindrical or spherical plots of functions in 3D. The solution is to use one of gnuplot’s pseudofles. The ++ pseudofle
Second, it requires the plot command to be run in order to call the point into existence. This means that if there is more than one point I want to plot, I have to append plot statements to the main plot statement. If I want to do this in any kind of scripted way, instead of just as an explicit list, I’m back to having to run a macro, which as
Plotting 3D Surfaces. Surface plotting creates a 3D surface plot of a given matrix z. Entries of z are used as height values. It is also possible to specify x and y locations corresponding to each point in z. If a terminal with interactive capabilities is being used by Gnuplot backend (like x11 or wxt or qt), then rotating, zooming is also

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