[GRASS5] plot 2 components

GRASS GRASS developer
1

If i have in file two components and wish to plot the
resultant, how i can do it???
The data already i did read with v.in.ascii, my data
file have five columns, one for lat, lon, X component,
Y component, Cat, so how plot X and Y component to
generate a map with vector resultant???

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2

If i have in file two components and wish to plot the
resultant, how i can do it???
The data already i did read with v.in.ascii, my data
file have five columns, one for lat, lon, X component,
Y component, Cat, so how plot X and Y component to
generate a map with vector resultant???

perhaps it is fairly easy (for a C programmer) to modify
'd.vect.chart ctype=pie' in single column bubble plot mode to plot an
arrow/barb rather than a circle?

otherwise you could do sqrt(x^2+y^2) before loading into grass and then
at least get magnitude in the above bubble plot manner.

or some fancy d.graph or d.mapgraph scripting.

Hamish