FrequencySeries plots fail

Created by: andrew-lundgren

Plots of ASDs which worked in previous versions of gwpy now fail with a long error message. It seems to be a problem with zero values breaking the auto-scaling of the axes. The plotting function loglog, on which the plot is presumably based, does not have the same issue.

Example code:

from gwpy.timeseries import TimeSeries
data=TimeSeries.fetch('L1:GDS-CALIB_STRAIN',1174445490,1174445494)
data.asd(2,1).plot().show()

The resulting error is FSplot_err.txt

Either of the following work

myasd=data.asd(2,1)

# Remove zero frequency bin
myasd[1:].plot().show()

# Use loglog directly
import matplotlib.pyplot as plt
plt.loglog(myasd.frequencies, myasd)
plt.show()