Re: [Matplotlib-users] problem with new symbols

[Nicolas G. <gr...@as...>]

Hi,

it seems that there are a bug in numerix with numarray (it's working fine w=
ith=20
numpy) and the random array package.

$ python scatter_custom_symbol.py
Traceback (most recent call last):
  File "scatter_custom_symbol.py", line 9, in ?
    x,y,s,c =3D nx.rand(4, 30)
AttributeError: 'module' object has no attribute 'rand'
humufr@tigane:~/tmp/Python/SCIPY/matplotlib/matplotlib/examples

N.


Le Friday 19 Mai 2006 10:10, John Hunter a =E9crit=A0:
> >>>>> "Eric" =3D=3D Eric Emsellem <ems...@ob...> writes:
>
>     Eric> Hi again, I am trying to see if I could produce a scatter
>     Eric> plot (using "scatter" or "plot") but using NEW symbols (so
>     Eric> not already available in the list provided). I would like to
>     Eric> design new symbols (in some way which is to be defined) so
>     Eric> that scatter and/or plot would be able to use them.
>     Eric> Examples: horizontal or vertical or even rotated ellipses,
>     Eric> icon sketched galaxy-looking symbols, ...
>
>     Eric> Any hint on how to do this?
>
>     Eric> thanks in advance for any help here!
>
>     Eric> Eric P.S.: I already posted a similar question a few days
>     Eric> ago, so forgive me for this repetition...
>
> persistence wins the day!
>
> I added an option to scatter to support custom markers.  You pass in a
> list if x,y vertices for the polygon you want to use as the marker.
>
> I haven't quite worked out the scaling yet, so for now use scale
> arguments that look right and understand that this may change when we
> get the scaling issue cleaned up.
>
> I added an example to svn revision 2402
> examples/scatter_custom_symbol.py.  Here it is, using an ellipse
>
>   from pylab import figure, nx, show
>
>   # unit area ellipse
>   rx, ry =3D 3., 1.
>   area =3D rx * ry * nx.pi
>   theta =3D nx.arange(0, 2*nx.pi+0.01, 0.1)
>   verts =3D zip(rx/area*nx.cos(theta), ry/area*nx.sin(theta))
>
>   x,y,s,c =3D nx.rand(4, 30)
>   s*=3D 10**2.
>
>
>   fig =3D figure()
>   ax =3D fig.add_subplot(111)
>   ax.scatter(x,y,s,c,marker=3DNone,verts =3Dverts)
>
>   show()
>
> One thing we can do to make this more user friendly is to add new
> symbols to the scatter symbol table, eg
>
> 'wellipse' : a wide ellipse
> 'tellipse' : a tall ellipse
>
> and map names to sequences of vertices.  So as you create the custom
> symbols you want to use, send them to me and I'll add them to the
> defaults, where appropriate.
>
> Cheers,
> JDH
>
>
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