Dear R-Help readers,
I am writing to ask about some behavior by stats::reshape() that surprised
me. In the example below, I expected the values of variables "R" and "L" in
data.frame "test" to be the reverse of what they are - ie I expected that
test$R = seq(1:29, by =2) and test$L = seq(2:30, by = 2).
data1 = data.frame(
check.names = F,
Participant = 1,
Treatment = "A", "2 min R" = 1L,
"2 min L" = 2L, "4 min R" = 3L, "4 min L" = 4L, "6 min R" = 5L,
"6 min L" = 6L, "8 min R" = 7L, "8 min L" = 8L, "10 min R" = 9L,
"10 min L" = 10L, "12 min R" = 11L, "12 min L" = 12L, "14 min R" =
13L,
"14 min L" = 14L, "16 min R" = 15L, "16 min L" = 16L, "18 min R" =
17L,
"18 min L" = 18L, "20 min R" = 19L, "20 min L" = 20L, "22 min R" =
21L,
"22 min L" = 22L, "24 min R" = 23L, "24 min L" = 24L, "26 min R" =
25L,
"26 min L" = 26L, "28 min R" = 27L, "28 min L" = 28L, "30 min R" =
29L,
"30 min L" = 30L)
varying1 = colnames(data1)[3:32]
test = reshape(
data = data1,
direction = "long",
idvar = c("Participant","Treatment"),
v.names = (c("R","L")),
timevar = "Time",
times = seq(2, 30, by = 2),
varying = varying1)
test
[ end code]
I looked into the definition of reshape, and found the following line:
varying <- split(varying, rep(v.names, ntimes))
The following edit seems to produce the behavior I expected:
varying <- split(varying, rep(v.names, ntimes))[v.names]
However, I strongly suspect I am making a mistake; I'd be grateful if
someone would help me find it.
Here is the output of sessionInfo():
R version 3.0.2 (2013-09-25)
Platform: x86_64-apple-darwin10.8.0 (64-bit)
locale:
[1] C
attached base packages:
[1] graphics datasets stats utils grDevices methods base
other attached packages:
[1] rj_1.1.3-1
loaded via a namespace (and not attached):
[1] rj.gd_1.1.3-1 tools_3.0.2
Thanks,
Doug
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