# negative values on polar plot (decibels polar plots )

Discussion in 'Python' started by yadin, Aug 14, 2007.

hi every one can you please
can you help me to fix these polar plot in db's
so that the center is at the minimun negative number in voltagedb
and the maximun is at zero
how can i see values on the axies like showing that the axes start at
-40 -30 .....0
than you

import wx
import os
from wx.lib.colourdb import *
from pylab import*
angteta = [ 4.36332313e-003, 3.18522588e-001, 6.32681854e-001,
9.46841119e-001,
1.26100038e+000, 1.57515965e+000, 1.88931892e+000,
2.20347818e+000,
2.51763745e+000, 2.83179671e+000, 3.14595598e+000,
3.46011524e+000,
3.77427451e+000, 4.08843377e+000, 4.40259304e+000,
4.71675230e+000,
5.03091157e+000, 5.34507083e+000, 5.65923010e+000,
5.97338936e+000,]

voltage = [ 0.00363471, 0.26569155, 0.52562334, 0.76330428,
0.93673361, 1. ,
0.93321713, 0.75733232, 0.5185449 , 0.25840091,
0.00363471, 0.26569155,
0.52562334, 0.76330428, 0.93673361, 1. ,
0.93321713, 0.75733232,
0.5185449 , 0.25840091,]

#voltagedb = 20*log10(voltage)

voltagedb = [-48.7906044 ,-11.51244516, -5.58650713, -2.34604603,
-0.56767793, 0. ,
-0.60034598, -2.41427014,
-5.7042726 ,-11.75411924,-48.7906044 ,
-11.51244516, -5.58650713, -2.34604603, -0.56767793,
0. ,
-0.60034598, -2.41427014, -5.7042726 ,-11.75411924,]
polar(angteta,voltagedb)

show()