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Tally

Tally[list]
tallies the elements in list, listing all distinct elements together with their multiplicities.

Tally[list, test]
uses test to determine whether pairs of elements should be considered equivalent, and gives a list of the first representatives of each equivalence class, together with their multiplicities.

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Tally[list] lists distinct elements in the order they appear in list.

Tally[list] is equivalent to Tally[list, SameQ].

EXAMPLES

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Basic Examples (2)

Obtain tallies for a list of symbols:

Use test argument to count expressions with the same Head:

Obtain tallies for a list of symbols:

In[1]:=

Out[1]=

Use test argument to count expressions with the same Head:

In[1]:=

Out[1]=

Scope (3)

Results are returned in order of first occurrence in the list:

Count the instances of randomly generated integers:

Elements of the list can be any expression:

Applications (1)

Count occurrences of characters in a string:

Properties & Relations (3)

Elements with highest frequencies are given by Commonest:

A sorted Tally is equivalent to a list of counts for the Union:

Tally is a discrete analog of BinCounts: