\vector(x slope,y slope){length}
The \vector command draws a line with an arrow of the specified length and slope. The x and y values must lie between -4 and +4, inclusive.
\vector(x sklon,y sklon){delka}
Prikaz \vector namaluje caru zakoncenou sipkou (vektor) zadane delky a sklonu. Hodnoty x a y sklonu musi byt v intervalu od -4 do 4 vcetne.