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

[blender86 <j.m...@mb...>]

ok, didn't think of that. A bit of a hack, but it should work. Thanks.



Thomas Sefzick wrote:
> 
> 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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