start=[1990 11 1 0 0 0];
stop=[1991 2 1 0 0 0];
jd=julian(start):julian(stop); 
u=sin(.1*jd(:));
v=cos(.1*jd(:));
w=u+i*v;
timeplt(jd,[u w],[1 2],['meters';' cm/s ']);
