how to grouping of data in R

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how to grouping of data in R

memonsalim2008
Hi All,

is it possible in R groping of data ?Please check blow example.


student_id  Fee
5555 1200
5555 1200
1111 1200
6666 1500
6666 1500
6666 1000
7777 1000
8888 1000
8888 1000
8888 1000
8888 1000

output of will be

student_id   count
5555  2
1111  1
6666  3
7777  1
8888 4





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