[R] rownames in an apply function

From: santosh <santosh.srinivas_at_gmail.com>
Date: Tue, 19 Apr 2011 03:59:47 -0700 (PDT)


Dear Group,

I am doing an apply function on a zoo object. I need the rownames to be passed to the function.
Any suggestions on how to accomplish this?

Here is the code I am using

tmp <-

structure(c(611.55, 611.55, 611.55, 611.55, 611.55, 520, 520,
520, 520, 520, 425, 425, 425, 432.2, 432.2, 337, 338, 328.95,
328.95, 328.95, 243.8, 242.775, 238.5, 239, 235.925, 161.7, 156.625,
152.825, 151.95, 151.9, 1.5, 1.5, 1.5, 1.5, 1.5, 2, 2.15, 2.15,
2, 2, 3, 2.95, 3.175, 3.2, 3.15, 6, 6.15, 6.525, 6.6, 6.6, 14.5,
14.5, 15.15, 15.45, 15.3, 32.05, 32.05, 33.09, 33.8, 33.23), .Dim =
c(5L,
12L), .Dimnames = list(c("2011-04-19 09:24:30", "2011-04-19 09:25:00",
"2011-04-19 09:25:30", "2011-04-19 09:26:00", "2011-04-19 09:26:30" ), c("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L" )), index = structure(c(1303185270, 1303185300, 1303185330, 1303185360,
1303185390), class = c("POSIXt", "POSIXct"), tzone = ""), class = "zoo")

> tmp

                      A   B   C   D   E   F   G    H    I    J    K
L
2011-04-19 09:24:30 612 520 425 337 244 162 1.5 2.00 3.00 6.00 14.5 32.0
2011-04-19 09:25:00 612 520 425 338 243 157 1.5 2.15 2.95 6.15 14.5 32.0
2011-04-19 09:25:30 612 520 425 329 238 153 1.5 2.15 3.17 6.53 15.2 33.1
2011-04-19 09:26:00 612 520 432 329 239 152 1.5 2.00 3.20 6.60 15.4 33.8
2011-04-19 09:26:30 612 520 432 329 236 152 1.5 2.00 3.15 6.60 15.3 33.2

> apply(tmp,1,function(x)(print (rownames(x))))
NULL

NULL
NULL
NULL
NULL
NULL
>#How can I get the rownames here instead?



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