Dear Jason,
Have a look at years() from the chron package.
library(chron)
HouseDates <- c("02/27/90", "02/27/91", "01/14/92", "02/28/93",
"02/01/94", "02/01/95", "02/01/96")
HouseDatesFormatted<-as.Date(HouseDates, "%m/%d/%y")
years(HouseDates)
HTH,
Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
thierry.onkel...@inbo.be
www.inbo.be
To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data.
~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey
-----Oorspronkelijk bericht-----
Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
Namens Jason Rupert
Verzonden: donderdag 4 juni 2009 4:45
Aan: R-help@r-project.org
Onderwerp: [R] Getting a column of values from a list - think I'm doing
it thehard way
Example code it shown below.
I think I am doing this the hard way. I'm just trying to get the full
year value from an array of dates. An example array is shown below.
Right now, I'm using a "for" loop to pull the year out of a list where
the dates were split up into their individual components.
This seems to work, but just wondering if there is an easier way.
Thanks for any insights.
#*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
HouseDates <- c("02/27/90", "02/27/91", "01/14/92", "02/28/93",
"02/01/94", "02/01/95", "02/01/96")
# ?as.Date
HouseDatesFormatted<-as.Date(HouseDates, "%m/%d/%y")
HouseDatesFormatted
HouseDatesList<-strsplit(as.character(HouseDatesFormatted), "-",
fixed=TRUE)
HouseYear_array<-NULL
length_array<-length(HouseDatesList)
for(ii in 1:length_array)
{
HouseYear<-HouseDatesList[[ii]][1]
HouseYear_array<-c(HouseYear_array, HouseYear) }
as.character(HouseYear_array)
# Desired:
# [1] "1990" "1991" "1992" "1993" "1994" "1995" "1996"
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