[R] help in ddply

[arunkumar1111]

Hi

I've records like this
df=
x	panel
4	1
93	2
21	3
83	4
75	1
87	2
87	3
78	4
50	1
76	2
86	3
65	4
84	1
40	2
39	3
26	4


i want to create histogram out of it . i want all the mid and count values
for panel wise

my code is 
histoutput = ddply(df,.(df[2]),hist)

i'm not able to get the required result.

please help me
using for loop takes a lot of time if there are more records

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Thanks in Advance
        Arun
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