File Applications/SpinW/m_files/sw_arrow.m

  draws a 3D arrow
 
  [handle] = SW_ARROW(rStart, rEnd, R, alpha, lHead, N)
 
  Input:
 
  rStart  Coordinate of the starting point.
  rEnd    Coordinate of the end point.
  R       Radius of the arrow body.
  alpha   Angle of the head in degrees.
  lHead   Length of the head.
  N       Number of the points of the surface mesh.