[datatable-help] 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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