Dears, The arrows command uses the start and end coordinates of each vector, but I have the starting coordinates, azimuth, and length. So, There are package that plot this arrows? Example: > x<- c(1,2,4) > y<- c(2,3,5) > Azimuth<- c(45,90,180) > Length<- c(1,0.5,1) Thanks, Julio [[alternative HTML version deleted]]