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Series.asof(where, subset=None)[source]

The last row without any NaN is taken (or the last row without NaN considering only the subset of columns in the case of a DataFrame)

New in version 0.19.0: For DataFrame

If there is no good value, NaN is returned for a Series a Series of NaN values for a DataFrame


where : date or array of dates

subset : string or list of strings, default None

if not None use these columns for NaN propagation


where is scalar

  • value or NaN if input is Series
  • Series if input is DataFrame

where is Index: same shape object as input

See also



Dates are assumed to be sorted Raises if this is not the case

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