gnuplot-py-users

[Gnuplot-py-users] pm3d in several surfaces

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

Hi everybody,
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?

  Many thanks in advance, 
  and have happy new year!
  Albert

  P.S.-the same happens if I type 
     apply(g.splot, data) 
     instead of g.splot(*data)
    

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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

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

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

al...@mm... wrote:
>>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

I suggest that you find out how to do what you need to do using gnuplot
and let us know.  Then we might be able to get Gnuplot.py to do the same
thing.

Michael

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

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

> I suggest that you find out how to do what you need to do using gnuplot
> and let us know.  Then we might be able to get Gnuplot.py to do the same
> thing.

  You're right, 
  I'm going to investigate it with naked gnuplot, and you'll know about.
  Thanks everybody

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