Re: [Gnuplot-info] Plotting rectangles in spherical coordinates

[Jaime V. <vi...@fe...>]

On 11/11/24 20:16, Patrick Alken wrote:
> Is there a way to plot colored rectangle objects using spherical 
> coordinates to define them? I made a post on stackoverflow with my 
> dataset and what I'm trying to do:
>
> https://stackoverflow.com/questions/79178991/drawing-rectangles-in-spherical-coordinates-in-gnuplot 
>
>
> I am looking for a command like:
>
> set obj 1 rect from spherical THETA0,PHI0,R to spherical THETA1,PHI1,R
>
> but it doesn't appear this is possible (yet) in gnuplot. Is there 
> anyway to do this?
>
>
Hello,

This is probably not what you are looking for, but in any case, using 
Maxima (maxima.sourceforge.net) I can generate a gnuplot input file with 
something similar to what you want, with the following commands:

d:%pi/10$
f:makelist([5,[th,5*d,6*d],[ph,i*d,i*d+d]],i,0,20)$
f:append(f,makelist([5,[th,4*d,5*d],[ph,i*d,i*d+d]],i,0,20))$
f:append(f,makelist([5,[th,3*d,4*d],[ph,i*d,i*d+d]],i,0,20))$
f:append(f,makelist([5,[th,2*d,3*d],[ph,i*d,i*d+d]],i,0,20))$
plot3d(f,[transform_xy, spherical_to_xyz],[grid,1,1],[z,-5,5],[gnuplot_script_file,"spherical_rectangles.gpt"],nolegend);

The last command will show you the location where the 
"spherical_rectangles.gpt" file was saved.

Regards,

Jaime Villate