The 2D vectors style draws a vector from (x,y) to (x+xdelta,y+ydelta). The 3D vectors style is similar, but requires six columns of basic data. A small arrowhead is drawn at the end of each vector.
4 columns: x y xdelta ydelta
6 columns: x y z xdelta ydelta zdelta
splot with vectors is supported only for `set mapping cartesian`. The keywords "with vectors" may be followed by arrow style specifications. See `arrowstyle` for more details.
Example:
plot 'file.dat' using 1:2:3:4 with vectors head filled lt 2
splot 'file.dat' using 1:2:3:(1):(1):(1) with vectors filled head lw 2
`set clip one` and `set clip two` affect vectors drawn in 2D. Please see clip and `arrowstyle`.