Re: Plotting 2 3D functions on one plot ?

[Juan Pablo Carbajal]

There are plenty of functions to plot in 3D[1]
You need to select the one that accomplish what you want.
Then you need to write functions that convert your 3D objects into the
data format the selected function needs
Finally you need to call the plotting functions for the converted
objects after you have hold on the plot.

figure(1)
hold on
# call the 3d plotting function on object one
# call the 3d plotting function on object two
# fix axes, camera position, lights, view, annotations, etc

I hope my abstract description leads you somewhere.

[1] 
https://octave.org/doc/interpreter/Three_002dDimensional-Plots.html#Three_002dDimensional-Plots