[Gnuplot-info] Vector in 3D

[Peter D. <pc...@wi...>]

I'd like to graph the vector <a b c> passing through (x0 y0 z0),
expressible parametrically by x = x0 + at, y = y0 + bt, z = z0 + ct.

Intuitively, I should be able to give gnuplot something like:

    set parametric
    splot x0 + a*u, y0 + b*u, z0 + c*u

but it doesn't seem to work; what am I missing?