Define and calculate wind bin for wind speed values.
## BIN DEFINITION
# set bin
def setbin(vspeed):
for k, v in dbin.items():
if (vspeed>=v[1]) and (vspeed<v[2]): return int(k)
ibin = 0
dbin = dict()
for il in range(16):
# set limits
il1 = il
if il==15: il2 = 9999
else: il2 = il+1
# define bin and store
dbin[ibin]=['%s<=hws<%s'%(il1,il2),il1,il2]
# define number of bin
ibin += 1