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18.1.12  Frequencies

The frequency of a number in a list is the fraction of the list equal to the number. The frequencies or frequences command finds the frequencies of the numbers in a list.

Example

frequencies([1,2,1,1,2,1,2,4,3,3])
     




10.4
20.3
30.2
40.1




          

You can use this, for example, to simulate flipping a fair coin and seeing how many times each side appears; to flip a coin 1000 times, for example:

frequencies([rand(2)$(k=1..1000)])
     


00.484
10.516


          

(See Section 18.3.2 for information on rand.)


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