add_cyclic

cfplot.add_cyclic(field, lons)

A wrapper for cartopy_util.add_cyclic_point(field, lons).

This is needed for the case of when the longitudes are not evenly spaced

due to numpy rounding which causes an error from the cartopy wrapping

routine. In this case the longitudes are promoted to 64 bit and then

rounded to an appropriate number of decimal places before passing to

the cartopy add_cyclic routine.