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Pandas: Data Manipulation - cut() function

cut() function

The cut() function is used to bin values into discrete intervals.

Use cut when you need to segment and sort data values into bins. This function is also useful for going from a continuous variable to a categorical variable. For example, cut could convert ages to groups of age ranges. Supports binning into an equal number of bins, or a pre-specified array of bins

Note: bins : numpy.ndarray or IntervalIndex. The computed or specified bins. Only returned when retbins=True. For scalar or sequence bins, this is an ndarray with the computed bins. If set duplicates=drop, bins will drop non-unique bin. For an IntervalIndex bins, this is equal to bins.

Syntax:

pandas.cut(x, bins, right=True, labels=None, retbins=False, precision=3, include_lowest=False, duplicates='raise')

Parameters:

Name Description Type Default Value Required / Optional
x The input array to be binned. Must be 1-dimensional. array-like   Required
bins The criteria to bin by.
  • int : Defines the number of equal-width bins in the range of x. The range of x is extended by .1% on each side to include the minimum and maximum values of x.
  • sequence of scalars : Defines the bin edges allowing for non-uniform width. No extension of the range of x is done.
  • IntervalIndex : Defines the exact bins to be used. Note that IntervalIndex for bins must be non-overlapping.
int, sequence of scalars, or IntervalIndex   Required
right Indicates whether bins includes the rightmost edge or not. bool, Default: True Required
labels Specifies the labels for the returned bins. Must be the same length as the resulting bins. If False, returns only integer indicators of the bins. This affects the type of the output container (see below). This argument is ignored when bins is an IntervalIndex. array or bool   Optional
retbins Whether to return the bins or not. Useful when bins is provided as a scalar. bool Default: False Required
precision The precision at which to store and display the bins labels. int Default: 3 Required
include_lowest Whether the first interval should be left-inclusive or not. bool Default: False Required
duplicates If bin edges are not unique, raise ValueError or drop non-uniques.   Default: Raise, Drop Optional

Returns: out : Categorical, Series, or ndarray An array-like object representing the respective bin for each value of x.
The type depends on the value of labels.

  • True (default) : returns a Series for Series x or a Categorical for all other inputs. The values stored within are Interval dtype.
  • equence of scalars : returns a Series for Series x or a Categorical for all other inputs. The values stored within are whatever the type in the sequence is.
  • False : returns an ndarray of integers.

Example:

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