test.py

# seq  = ('name ', 'roll', 'class')
# keys = [1, 2, 3]

# dict1 = dict.fromkeys(seq, keys)
# print "%s" % dict1

# -*- coding: utf-8 -*-
"""
Spyder Editor

This is a temporary script file.
"""

import matplotlib.pyplot as plt

short_loss = [-10,-10,-10,-10,-10,-10,-10.13788284,-10.28028724,-10.9017663,-10.81904104,-11.0720997,-11.24938737,-12.04119983,-12.74701057,-13.01029996,-13.59021943,-15.05149978,-18.06179974,-19.03089987,-22.04119983]
short_freq = [0.050,.100,.150,.200,.400,.500,.800,1,2.5,3.0,4.0,4.5,5,6,7,9,10,11,12,13]

long_loss = [-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-5.051499783,-6.020599913,-6.600519383,-7.269987279,-7.269987279,-8.06179974,-10.28028724,-10.9017663,-11.24938737,-13.01029996,-13.59021943]
long_freq = short_freq

max_val = max(long_freq)
print max_val
electrical_bandwidth = max_val * .707
optical_bandwidth = max_val * 0.5

fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.xaxis.set_ticks_position('top')
# plt.gca().invert_yaxis()
plt.plot(short_freq, short_loss, '--', linewidth=5, label='Short Cable', color="red")
plt.plot(long_freq, long_loss, '-', label='Long Cable', linewidth=6, color="blue")

plt.xlabel('Frequency ' + r'$f(MHz)$')
ax.xaxis.tick_top()
plt.gca().set_ylim([min(short_loss), -3])
plt.ylabel('Loss ' + r'$dB$')
plt.show()

short_voltage=[0.04,0.04,0.04,0.04,0.04,0.04,0.03875,0.0375,0.0325,0.033125,0.03125,0.03,0.025,0.02125,0.02,0.0175,0.0125,0.00625,0.005,0.0025]
long_voltage=[0.125,0.125,0.125,0.125,0.125,0.125,0.125,0.125,0.125,0.125,0.1,0.0875,0.075,0.075,0.0625,0.0375,0.0325,0.03,0.02,0.0175]
# plt.axvline(short_voltage[])
plt.axvline(optical_bandwidth, label="Optical Bandwidth" + r'$\; B_{o}$', linewidth = 3, color="red")
plt.axvline(electrical_bandwidth, label="Electrical Bandwidth"  + r'$\; B_{e}$', linewidth = 3, color="blue")
plt.plot(short_freq, short_voltage, '--', linewidth=5, label='Short Cable', color="red")
plt.plot(long_freq, long_voltage, '-', linewidth=6, label='Long Cable', color="blue")
plt.xlabel('Frequency ' + r'$f(MHz)$')
plt.ylabel('Output Voltage (without gain) ' + r'$V_{0} \; (V)$')
plt.legend(loc='best')
plt.show()