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

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

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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