[GAP Forum] Frequencies in a list

[Robert F. Morse]

Bulutoglu Dursun A Civ AFIT/ENC wrote:
> 	Dear Gap Forum;
> 	I was wondering whether there is a function in GAP that does the
> following:
> 	
> Input: a list of numbers
> 	Output: the numbers in the list sorted from small to large and
> the frequencies at which they appear in the list.
> 	Dursun.

Dear Dursun,

Use the Collected command (see, Chapter 21.20 of the reference manual).

Example:

gap> Collected([1,1,1,1,1,1,2,2,-1,-1]);
[ [ -1, 2 ], [ 1, 6 ], [ 2, 2 ] ]


Regards, Robert F. Morse