Re: [Gnuplot-py-users] pm3d in several surfaces

[Michael H. <mh...@al...>]

al...@mm... wrote:
> I want to use gnuplot.py to represent several "4D" surfaces in the same plot, so
> I write something like:
> 
>   data1 = [
>     [
>         [1,1,z1(1,1),val1(1,1)],
>         [1,2,z1(1,2),val1(1,2)],
>         [1,3,z1(1,3),val1(1,3)],
>     ],
>     [
>         [2,1,z1(2,1),val1(2,1)],
>         [2,2,z1(2,2),val1(2,2)],
>         [2,3,z1(2,3),val1(2,3)],
>     ],
>     ...
>     ]
> 
>   data2 = [
>     [
>         [1,1,z2(1,1),val2(1,1)],
>         [1,2,z2(1,2),val2(1,2)],
>         [1,3,z2(1,3),val2(1,3)],
>     ],
>     [
>         [2,1,z2(2,1),val2(2,1)],
>         [2,2,z2(2,2),val2(2,2)],
>         [2,3,z2(2,3),val2(2,3)],
>     ],
>     ...
>     ], 
> 
>   ...
> 
>   dataN = ...
> 
>   and then, data = [Gnuplot.Data(data1, using=(1,2,3,4), inline = 1), 
>                     Gnuplot.Data(data2, using=(1,2,3,4), inline = 1),
>                     ...
>                     Gnuplot.Data(dataN, using=(1,2,3,4), inline = 1)]
> 
>   So, when I go to plot:
>     g = Gnuplot.Gnuplot(debug = 1)
>     g.splot(*data)
> 
>   it seems something works because you can read:
>   gnuplot> splot '-' using 1:2:3:4 notitle, '-' using 1:2:3:4 notitle, '-' using
> 1:2:3:4 notitle, '-' using 1:2:3:4 notitle, '-' using 1:2:3:4 notitle
>   on your terminal, but only the last surface is plotted, maybe because the
> (x,y) pairs are the same in data1, data2, ...
> 
>   So, how can I solve this?
>   My target is to see all the 3D points in different colors or something like
> that... do you understand?

I'm a bit out of practice.  How do you expect the four values to be
used?  Usually splot uses (x,y,z) triplets, no?

Otherwise I don't see why this shouldn't work.  I can't imagine that it
would be a problem that the (x,y) pairs are the same.  Ideas:

1. If you have hidden line removal on (which is the default, I think) it
could be that all of your surfaces are being plotted but the top surface
is visually obscuring the other surfaces.

2. If your z values are all the same, then you would not see distinct
surfaces.

3. Try the same thing without the inline=1 option.  Does that work?
(This would imply a Gnuplot.py bug.)

4. Try a simple example with "naked" gnuplot, rather than Gnuplot.py,
using temporary files to hold the data.  Does it do what you expect?

Michael