[R] Histogram classwise

[arunkumar1111]

Hi 
I have a data class wise. I want to create a histogram class wise without
using for loop as it takes a long time 
my data looks like this

x	class
27	1
93	3
65	5
1	2
69	5
2	1
92	4
49	5
55	4
46	1
51	3
100	4




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Thanks in Advance
        Arun
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