Re: fast scatter plots - advice sought

[David Bateman]

Jaroslav Hajek wrote:
> On Fri, Jan 15, 2010 at 3:06 PM, dbateman <address@hidden> wrote:
>   
> > Ok, so given this and the feedback from Shai both scatter and the gnuplot
> > backend do the wrong thing here. I'll fix this over the weekend.
> >
> > Thanks
> > David
> >
> >     
>
> I didn't quite follow the information flow, but I noted that if in
> Matlab you do scatter (x, y, s, c) where x, y, c are long column
> vectors and s is a scalar, Matlab creates a single patch that can
> handle the varying color, through property VertexCData or something
> like that. Is this possible for Octave? If so, then in this case one
> would not need to split by unique colors and sizes, but just by sizes,
> which would probably be much faster when variable colors are used.
>
> OTOH, when colors are specified as a full RGB Nx3 array, Matlab (2007)
> seems to invariably make one patch per point.
>
>   
The cdata is used if MarkerFaceColor or MarkerEdgeColor are "flat". So 
yes you should be able to group all of the patches together if CData is 
given

D.


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