✖

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.

Details

Tally[list] lists distinct elements in the order they appear in list.
Tally[list] is equivalent to Tally[list,SameQ].

Examples

open allclose all

Basic Examples (2)Summary of the most common use cases

Obtain tallies for a list of symbols:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-hyxh5b

Out[1]=1

Count the elements of a list having the same head:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-efhgxk

Out[1]=1

Scope (3)Survey of the scope of standard use cases

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

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-dtg63s

Out[1]=1

Count the instances of randomly generated integers:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-boob44

Out[1]=1

Elements of the list can be any expression:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-eflpej

Out[1]=1

Applications (1)Sample problems that can be solved with this function

Count occurrences of characters in a string:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-bsopdh

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-h27six

Out[2]=2

Properties & Relations (5)Properties of the function, and connections to other functions

Elements with highest frequencies are given by Commonest:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-nqs6t

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-iv5hh7

Out[2]=2

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

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-gpz0if

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-jag94w

Out[2]=2

Tally is a discrete analog of BinCounts:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-htjze5

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-okx53

Out[2]=2

In[3]:=3

✖

https://wolfram.com/xid/0bimqcq4-he7bxm

Out[3]=3

Counts[list] returns an association in which values are the tallies of their keys:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-xektry

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-63of9c

Out[2]=2

Use the second argument of Tally to construct its corresponding by-function:

In[1]:=1

✖

https://wolfram.com/xid/0bimqcq4-qbleql

Count odd and even numbers in a list:

In[2]:=2

✖

https://wolfram.com/xid/0bimqcq4-1zbjm8

Out[2]=2

Top