DatetimeIndex.to_perioddelta(freq) Calcuates TimedeltaIndex of difference between index values and index converted to PeriodIndex at specified freq. Used for vectorized offsets
New in version 0.17.0.
| Parameters: | freq : Period frequency |
|---|---|
| Returns: | y : TimedeltaIndex |
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http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DatetimeIndex.to_perioddelta.html