Re: [Plplot-general] surface plot questions

[Alan W. Irwin]

On 2018-03-23 15:29-0400 David Bergman wrote:

Thanks for the tip.  If I do get that far I will post it.  Do I need to be a 
developer on this project?  Or should I just email out to the group?


Attaching a (compressed) patch to a post to this mailing list would be
fine.  And if/when that time comes I would encourage you to generate
that patch with "git format-patch" since that makes it easier to give
you git credit for your work.  But if you don't want to use that git
command a patch generated any other way would also be acceptable.

And to answer your first question, if someone shows sustained interest
in PLplot development by submitting good patches over a significant
number of months, and they let us know they hope to continue to
actively develop PLplot, then we generally invite that person to be a
core PLplot developer which gives them several project-related
capabilities (e.g., push capability for our git repository, the
ability to add to our wiki, etc.).

But even if you are not a core PLplot developer, you can help us a lot
by sending in patches for single-issue improvements (such as discussed
above) or by doing comprehensive testing of PLplot.

That latter simply consists of running

scripts/comprehensive_test.sh

for the HEAD of the git master branch for PLplot for some (or ideally
all) of the platforms you have access to.  That script runs all our
tests for all our major build-tree and install-tree configurations,
and assembles the results into a report tarball. If you send that
report tarball to us (as an attachment to a post to this list) it is
easy for us to analyze it for any PLplot problems on the platforms
where you are running the script and also give you credit for running
that test in our wiki with an entry in the comprehensive testing
report table in
.

To learn more about that script run

scripts/comprehensive_test.sh --help

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
__

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Re: [Plplot-general] surface plot questions

[David Bergman]

Thanks for the tip.  If I do get that far I will post it.  Do I need to 
be a developer on this project?  Or should I just email out to the group?




On 3/21/2018 10:26 PM, Alan W. Irwin wrote:

On 2018-03-21 18:47-0400 David Bergman wrote:


Alan,

Thanks for the reply.  MATLAB and SCILAB functions are overloaded to 
allow to this.  For example the following figures were generated by 
such a call to surf(x,y,z), with x, y, and z each a n-by-n matrix.


I believe this causes the function to trace curves of constant u and 
v, though I am not sure.  I use it to make 3-dim cardioid patterns.


I believe the following wound work (with some mods).

u = linspace(min,max,n);

[U,V] = meshgrid(u,u);

define some functions.

X(U,V), Y(U,V), Z(U,V)

then

surf(X,Y,Z).

if u and v are theta and phi in spherical coordinates, then 
sin(Th).*cos(Ph), sin(Th).*sin(Ph), cos(Th) would generate the unit 
sphere.


Hi David:

Cool plots!

And I just realized we could produce something like those with
.
For an example that uses calls to plpoly3 to plot a unit sphere, see
.  It should be
possible (but likely not trivial) to modify that example to plot 
something more

interesting than the unit sphere, and with a convenient API, e.g.,

void
plmeshxyz(PLINT nx, PLINT ny, PLINT nz, PLFLT_MATRIX x, PLFLT_MATRIX
PLFLT_MATRIX z);

where plmeshxyz calls plpoly3 appropriately inside.

I haven't looked at the details of what would be required, but if you
do have success with this type of approach, we will likely ask you to
donate your work to PLplot under the LGPL so others can benefit.

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
__




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Re: [Plplot-general] surface plot questions

[Alan W. Irwin]

On 2018-03-21 18:47-0400 David Bergman wrote:


Alan,

Thanks for the reply.  MATLAB and SCILAB functions are overloaded to allow to 
this.  For example the following figures were generated by such a call to 
surf(x,y,z), with x, y, and z each a n-by-n matrix.


I believe this causes the function to trace curves of constant u and v, 
though I am not sure.  I use it to make 3-dim cardioid patterns.


I believe the following wound work (with some mods).

u = linspace(min,max,n);

[U,V] = meshgrid(u,u);

define some functions.

X(U,V), Y(U,V), Z(U,V)

then

surf(X,Y,Z).

if u and v are theta and phi in spherical coordinates, then sin(Th).*cos(Ph), 
sin(Th).*sin(Ph), cos(Th) would generate the unit sphere.


Hi David:

Cool plots!

And I just realized we could produce something like those with
.
For an example that uses calls to plpoly3 to plot a unit sphere, see
.  It should be
possible (but likely not trivial) to modify that example to plot something more
interesting than the unit sphere, and with a convenient API, e.g.,

void
plmeshxyz(PLINT nx, PLINT ny, PLINT nz, PLFLT_MATRIX x, PLFLT_MATRIX
PLFLT_MATRIX z);

where plmeshxyz calls plpoly3 appropriately inside.

I haven't looked at the details of what would be required, but if you
do have success with this type of approach, we will likely ask you to
donate your work to PLplot under the LGPL so others can benefit.

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
__

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Re: [Plplot-general] surface plot questions

[David Bergman]

Alan,

Thanks for the reply.  MATLAB and SCILAB functions are overloaded to 
allow to this.  For example the following figures were generated by such 
a call to surf(x,y,z), with x, y, and z each a n-by-n matrix.


I believe this causes the function to trace curves of constant u and v, 
though I am not sure.  I use it to make 3-dim cardioid patterns.


I believe the following wound work (with some mods).

u = linspace(min,max,n);

[U,V] = meshgrid(u,u);

define some functions.

X(U,V), Y(U,V), Z(U,V)

then

surf(X,Y,Z).

if u and v are theta and phi in spherical coordinates, then 
sin(Th).*cos(Ph), sin(Th).*sin(Ph), cos(Th) would generate the unit sphere.


Thanks,
David




On 3/20/2018 10:09 PM, Alan W. Irwin wrote:

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
 and
,
but our other means of making 3D plots, e.g., plmesh (see

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
__





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[Plplot-general] surface plot questions

[David Bergman]

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.


Thank you in advance for your help.

David


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