import os, argparse

nr=103
nz=723
minR=5.15
stepR=0.1
maxR=15.35
minZ=0
stepZ=0.1
maxZ=72.3
nomfield=309.6

outfile=open("dummyfield","w")
string=str(nomfield)+" "+str(minR)+" "+str(stepR)+" "+str(nr)+" "
string+= str(minZ)+" "+str(stepZ)+" "+str(nz)+'\n'

outfile.write(string)
for i in range(nr):
    for j in range(nz):
        string ='0 '+str(nomfield)
        if i<20 and j<50:
            string='500 '+str(nomfield)
        if i>83 and j<50:
            string='-500 '+str(nomfield)
        string+='\n'
        outfile.write(string)
outfile.close()