[Gnuplot-info] Vectors with the same color as the underlying points

[Paulo E. A. <pau...@ci...>]

Hello,
I am doing a 3D plot where I have to plot some points colored by their
z-value.

unset key
set palette
splot 'file1.txt' using 1:2:3 with points palette pointtype 7 pointsize 0.75

But I also want to plot a vector on each point with the same color as the
previous plotted point. So I use

splot 'file1.txt' using 1:2:3 with points palette pointtype 7 pointsize
0.75, 'vecs.txt' using 1:2:3:4:5:6:(3) with vectors linetype palette

but I get the color of the vectors from the sixth coordinate in the
'vecs.txt' file which is always zero in my case and I end up with all black
vectors.
I know that I could do

splot 'file1.txt' using 1:2:3 with points palette pointtype 7 pointsize
0.75, 'vecs.txt' using 1:2:3:4:5:6 with vectors linetype palette cb 3

but I want to have the color determined by the third coordinate which gives
the height of each point. Is that possible ? or should I convert everything
to 'set arrow' commands ? How to plot the arrows with a color determined by
its third coordinate ?

Thanks in advance

Paulo

-- 
Paulo E. Abreu
Professor Auxiliar
Departamento de Química
Faculdade de Ciências e Tecnologia da Universidade de Coimbra