NaN, NaT
Also written: NaN, NaT, missing value, not a number, not a time
Markers for a missing number (NaN) and a missing date (NaT). Summary methods skip them, but row-by-row math gives NaN for any row with a gap.
Also written: NaN, NaT, missing value, not a number, not a time
Markers for a missing number (NaN) and a missing date (NaT). Summary methods skip them, but row-by-row math gives NaN for any row with a gap.