Re: [ePiX-users] 3D datafile plotting

[Constantin Greubel]

Andrew D. Hwang schrieb:
> On Fri, 28 Nov 2008, Constantin Greubel wrote:
>
> > one simple question: Is it possible to generate a 3D plot where the data
> > points come from a datafile?
> Hi Constantin,
>
> Yes. :)  For example, to make a 3D scatter plot with BOX markers using the
> first three columns of a data file, you can do:
>
> datafile df("myfile.dat");
> df.plot(BOX, 1, 2, 3);
>
> In case it's useful, if F is a P-valued function of three doubles, the
> command
>
> df.plot(BOX, i1, i2, i3, F);
>
> creates a 3-D scatter plot by passing columns i1, i2, and i3 to F and
> plotting the resulting points.
>
> Best,
> Andy

Is it also possible to plot surfaces instead of scattered points? E.g. 
like the pole.xp sample, but points given through a datafile instead of 
a function.

I have tried to build a function, that takes two points and a datafile

P Function(double x, double y, data_file DF){
        return P(x, y, DF.column(3)[2]); //dummy return
}
...
surface(Function, R);

but this won't work. Are there any other possibilities?

MfG
        Constantin Greubel