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

[<al...@mm...>]

> 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?
    I expect to see surfaces by (x,y,z) coloured in function of val, i.e., if
val is high I want to see the point in yellow and if it is low in black.
    
> 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.
    How do I know it? I tried with set & unset hidden3d, but it looks like the
same...  

>
> 2. If your z values are all the same, then you would not see distinct
> surfaces.
    You're right, but they aren't the same  
  
> 3. Try the same thing without the inline=1 option.  Does that work?
> (This would imply a Gnuplot.py bug.)
    It works the same.

> 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?
    No, it does the same... ;P
 
> Michael


In fact I can see the points colored typping
 splot  "temp.plot" using 1:2:3:4 with points pointtype 7 palette
but with no surface... (temp.plot is a file with the same data)

Maybe I shoud read the entire gnuplot tutorial... but I find it really boring...
;)

thank you very much!
Albert








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