def main():
"""
NAME
vdm_b.py
DESCRIPTION
converts V(A)DM to B
INPUT (COMMAND LINE ENTRY)
V[A]DM (Am^2), latitude (positive north)
OUTPUT
B (T)
SYNTAX
vdm_b.py [command line options] [< filename]
OPTIONS
-h prints help and quits
-i for interactive data entry
-f FILE input file
-F FILE output
"""
input,out="",""
if '-h' in sys.argv:
print main.__doc__
sys.exit()
if '-f' in sys.argv:
ind=sys.argv.index('-f')
file=sys.argv[ind+1]
f=open(file,'rU')
input=f.readlines()
if '-F' in sys.argv:
ind=sys.argv.index('-F')
o=sys.argv[ind+1]
out=open(o,'w')
if '-i' in sys.argv:
cont=1
while cont==1:
try:
vdm=float(raw_input('V[A]DM in Am^2: <cntl-D to quit '))
lat=float(raw_input('Latitude: '))
except:
print "\nGood bye\n"
sys.exit()
b= pmag.vdm_b(vdm,lat)
print '%10.3e '%(b)
if input=="":
input = sys.stdin.readlines() # read from standard input
for line in input:
b=spitout(line)
if out=="":
print '%10.3e'%(b)
else:
out.write('%10.3e \n'%(b))
def spitout(line):
dat=line.split() # split the data on a space into columns
vdm,lat=float(dat[0]),float(dat[1])
b= pmag.vdm_b(vdm,lat) #
return b
