[R] help in replacing for llop

[arunkumar1111]

Hi 

I have records like like this

X1	X2	State
34	72	state1
9	63	state1
49	31	state1
60	34	state1
80	73	state1
60	20	state2
59	87	state2
88	20	state2
71	66	state2
65	56	state2
59	16	state1
60	100	state2


I want to get the summarize value like mean median histogram for X1 and X2
based on state. I'm using FOR loop for this.  Is there any method to remove
for loop and use apply or any alternatives


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Thanks in Advance
        Arun
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