maxframe.dataframe.Series.nlargest#

Series.nlargest(n, keep='first')#

Return the largest n elements.

Parameters:

  • n (int, default 5) – Return this many descending sorted values.

  • keep ({'first', 'last', 'all'}, default 'first') –

    When there are duplicate values that cannot all fit in a Series of n elements:

    • firstreturn the first n occurrences in order

      of appearance.

    • lastreturn the last n occurrences in reverse

      order of appearance.

    • allkeep all occurrences. This can result in a Series of

      size larger than n.

Returns:

The n largest values in the Series, sorted in decreasing order.

Return type:

Series

See also

Series.nsmallest

Get the n smallest elements.

Series.sort_values

Sort Series by values.

Series.head

Return the first n rows.

Notes

Faster than .sort_values(ascending=False).head(n) for small n relative to the size of the Series object.

Examples

>>> import maxframe.dataframe as md
>>> countries_population = {"Italy": 59000000, "France": 65000000,
...                         "Malta": 434000, "Maldives": 434000,
...                         "Brunei": 434000, "Iceland": 337000,
...                         "Nauru": 11300, "Tuvalu": 11300,
...                         "Anguilla": 11300, "Montserrat": 5200}
>>> s = md.Series(countries_population)
>>> s.execute()
Italy       59000000
France      65000000
Malta         434000
Maldives      434000
Brunei        434000
Iceland       337000
Nauru          11300
Tuvalu         11300
Anguilla       11300
Montserrat      5200
dtype: int64

The n largest elements where n=5 by default.

>>> s.nlargest().execute()
France      65000000
Italy       59000000
Malta         434000
Maldives      434000
Brunei        434000
dtype: int64

The n largest elements where n=3. Default keep value is ‘first’ so Malta will be kept.

>>> s.nlargest(3).execute()
France    65000000
Italy     59000000
Malta       434000
dtype: int64

The n largest elements where n=3 and keeping the last duplicates. Brunei will be kept since it is the last with value 434000 based on the index order.

>>> s.nlargest(3, keep='last').execute()
France      65000000
Italy       59000000
Brunei        434000
dtype: int64

The n largest elements where n=3 with all duplicates kept. Note that the returned Series has five elements due to the three duplicates.

>>> s.nlargest(3, keep='all').execute()
France      65000000
Italy       59000000
Malta         434000
Maldives      434000
Brunei        434000
dtype: int64