[R] help in ddply

[R. Michael Weylandt]

Don't use ddply because you aren't returning a data.frame. Hist
objects are lists so use dlply.

dats <- structure(list(x = c(4L, 93L, 21L, 83L, 75L, 87L, 87L, 78L, 50L,
76L, 86L, 65L, 84L, 40L, 39L, 26L), panel = c(1L, 2L, 3L, 4L,
1L, 2L, 3L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 3L, 4L)), .Names = c("x",
"panel"), class = "data.frame", row.names = c(NA, -16L))

#please start using dput -- I've asked this before

dlply(dats, "panel", function(d) hist(d$x))

It's up to you to interpret the results.

Michael

On Tue, Apr 3, 2012 at 4:02 AM, arunkumar1111 <akpbond007 at gmail.com> wrote:
> 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
>
> -----
> Thanks in Advance
>        Arun
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