Mask the data array of each field where invalid values occur (NaNs or
infs).
Note that:
Invalid values in the results of arithmetic operations may only
occur if the raising of FloatingPointError exceptions has been
suppressed by cf.Data.seterr.
If the raising of FloatingPointError exceptions has been allowed
then invalid values in the results of arithmetic operations may be
automatically converted to masked values, depending on the setting
of cf.Data.mask_fpe. In this case, such automatic conversion might
be faster than calling mask_invalid.
Parameters :
i :bool, optional
If True then update the field list and its fields in place. By
default a new field list containing new fields is created.