It appears that these are time series (i.e. there is only one value of
River Mile in any one data frame) so if that's right you would be better
off representing them as time series. Using zoo:
library(zoo)
feb06.z - zoo(feb06[,2], feb06[,1])
may06.z - zoo(may06[,2], may06[,1])
jun06.z - zoo(jun06[,2], jun06[,1])
merge(feb06.z, may06.z, jun06.z)
feb06.z may06.z jun06.z
148 NA NA NA
185 NA NA NA
190 NA NA NA
198 NA NA NA
202 285 NA NA
Alternately this also works:
L - list(feb06 = feb06, may06 = may06, jun06 = jun06)
do.call(merge, lapply(L, function(x) zoo(x[,2], x[,1])))
feb06 may06 jun06
148 NANANA
185 NANANA
190 NANANA
198 NANANA
202 285NANA
Read the three vignettes that come with zoo and also ?merge.zoo
On Tue, Apr 29, 2008 at 10:42 AM, stephen sefick [EMAIL PROTECTED] wrote:
merge can only merge two objects at a time- I would like to merge more than
two objects at a time.
s.d - structure(list(RiverMile = c(202L, 198L, 190L, 185L, 179L, 148L,
119L, 61L)), .Names = RiverMile, row.names = c(NA, -8L), class =
data.frame)
#s.d is all of the river miles that can occur in all of the data frames that
I want to put together
feb06 - structure(list(RiverMile = c(202L, 190L, 185L), X2.1.06 =
c(285,
NA, NA)), .Names = c(RiverMile, X2.1.06), row.names = c(29L,
31L, 32L), class = data.frame)
may06 - structure(list(RiverMile = c(202L, 198L, 190L, 185L, 148L), X5.1.06
= c(NA_real_,
NA_real_, NA_real_, NA_real_, NA_real_)), .Names = c(RiverMile,
X5.1.06), row.names = c(29L, 30L, 31L, 32L, 34L), class = data.frame)
jun06 - structure(list(RiverMile = c(202L, 198L, 190L, 185L, 148L), X6.1.06
= c(NA_real_,
NA_real_, NA_real_, NA_real_, NA_real_)), .Names = c(RiverMile,
X6.1.06), row.names = c(29L, 30L, 31L, 32L, 34L), class = data.frame)
merge(s.d, feb06, all=T)
RiverMile X2.1.06
161 NA
2 119 NA
3 148 NA
4 179 NA
5 185 NA
6 190 NA
7 198 NA
8 202 285
#this is what I want- is there a way to implement this over many data frames
--
Let's not spend our time and resources thinking about things that are so
little or so large that all they really do for us is puff us up and make us
feel like gods. We are mammals, and have not exhausted the annoying little
problems of being mammals.
-K. Mullis
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