Re: [Plplot-general] surface plot questions

[Alan W. I. <ir...@be...>]

On 2018-03-20 17:05-0400 David Bergman wrote:

> All,
>
> I am interested in making a surface plot in 3-dim of a parameterized surface 
> in the following format,
> x(u,v), y(u,v), z(u,v)
> rather than the usual z = f(u,v).
>
> MATLAB, SCILAB, and Octave have this option and I was wondering if PLplot has 
> it as well.
> I did look through the examples and documented interfaces and nothing seemed 
> to match this.
>

Hi David:

Our plcont and plshades API's have this capability, see
<http://plplot.org/docbook-manual/plplot-html-5.13.0/plcont.html> and
<http://plplot.org/docbook-manual/plplot-html-5.13.0/plshades.html>,
but our other means of making 3D plots, e.g., plmesh (see
<http://plplot.org/docbook-manual/plplot-html-5.13.0/tri-d-plots.html>
for the full list of our 3D API's) have only one-dimensional x and y arguments.

By the way, can you give me an example of, say, a mesh plot of a
parameterized surface?  I thought such plots required one-dimensional
x and y vectors since the results are typically a collection of 3D
lines, z(y)_i, at a fixed set of one-dimensional x_i values and
another set of 3D lines, z(x)_j, at a fixed one-dimension set of y_j
values.  In fact, all the MATLAB examples I have just looked up of
mesh plots seem to be of this type.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________

Linux-powered Science
__________________________