"""
Convert 4-digit year to 2-digit year.
"""
[docs]
def year2yr(year):
"""
Convert 4-digit year to 2-digit year.
Parameters
----------
year : int or array-like
4-digit year (e.g. 2001).
Returns
-------
int or ndarray
2-digit year (e.g. 01). year-2000 if year>1999, else year-1900.
Notes
-----
Heritage from geodesy convention (GPS in 1980). See examples.
Examples
--------
>>> import pyacs
>>> pyacs.year2yr(1996)
>>> 96
>>> pyacs.year2yr(2011)
>>> 11
"""
import numpy as np
if isinstance(year, list):
year=np.array(year)
if isinstance(year, np.ndarray):
yr=np.array(list(map(year2yr,year)))
else:
if year > 1999:yr=year-2000
else:yr=year-1900
return(yr)