Re: [Gnuplot-info] Overlaying a vector field and colormap in Gnuplot

[Thomas S. <t.s...@fz...>]

2D ('plot') and 3D ('splot') use a completely different calculation of
margin widths, because in the 3D case, all axis tics and labels must
be visible regardless of the viewing angles, this requires space and
so the margins are larger in this case.

i assume that you are using 'set view map' (otherwise the 'plot ...
with vectors' would make sense), so the best would be to 'splot'
both graphs:

splot "colormapdata" with pm3d, "vectordata" using 1:2:(0):3:4:(0) with
vectors

replace the first '(0)' with a larger value if the vectors are covered
by the color map.


blender86 wrote:
> 
> I'm somewhat new to gnuplot and this combination has started to seem like
> an impossible task.
> The point is that a colormap under a vector field would denote the
> amplitude of each vector and that
> all the vectors would be the same length.
> 
> I want to plot a colormap with
> 
> splot "colormapdata" with pm3d
> 
> and a vector field on top of that with
> 
> plot "vectordata" using 1:2:3:4 with vectors
> 
> so that the plots are exactly overlapping.
> 
> Now I can make them both appear simultaneously with multiplot, but the
> cryptic
> coordinate system of gnuplot has driven my crazy trying to make the two
> plots overlap completely.
> 
> Why is it that if I specify
> origin 0,0
> size 0.5,0.5
> for both plots, they are not on top of each other. I mean, it would be
> logical, but for some reason the origin and size just seem like they have
> no particular logic.
> 

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