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list_plot_semilogy not working

import numpy import matplotlib.pyplot as plt noise=numpy.random.randn(1,10) signal = numpy.ones(10) snrdb = numpy.arange(10.)

print snrdb

import mpmath ber = [] for i in range(0,10): ber.append(n(0.5*mpmath.erfc(float(snrdb[i])/sqrt(2))))

list_plot_semilogy(zip(snrdb,ber))

Running the above code with list_plot works but the semilogy option yields an empty graph. Please resolve this. Thanks in advance.

list_plot_semilogy not working

import numpy import matplotlib.pyplot as plt noise=numpy.random.randn(1,10) signal = numpy.ones(10) snrdb = numpy.arange(10.) print snrdb numpy.arange(10.) #print snrdb import mpmath ber = [] for i in range(0,10): ber.append(n(0.5*mpmath.erfc(float(snrdb[i])/sqrt(2))))ber.append(n(0.5*mpmath.erfc(float(snrdb[i])/sqrt(2)))) list_plot_semilogy(zip(snrdb,ber))list_plot_semilogy(zip(snrdb,ber))

Running the above code with list_plot works but the semilogy option yields an empty graph. Please resolve this. Thanks in advance.