If velocities are plotted in logspace, a lower limit of 0
would be transformed to -inf - which results in a pyplot
warning and y-axis limits to be ignored. This sets the
default lower limit to 1, warns if it encounteres a lower
limit of 0 and sets it to 1 instead.
If velocities are plotted in logspace, a lower limit of 0 would be transformed to -inf - which results in a pyplot warning and y-axis limits to be ignored. This sets the default lower limit to 1, warns if it encounteres a lower limit of 0 and sets it to 1 instead.
Fixes #14.