# 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.

I've posted a bug report: http://trac.sagemath.org/sage_trac/ticket/13430