?as.POSIXlt On Tue, 24 Feb 2004, Ajay Shah wrote:
> I know this: > > > library(date) > > x="1979-04-04" > > try=as.date(x, "ymd") > > print(try) > [1] 4Apr79 > > and that `x' here has to be a string, e.g.: > > > x=1979-04-04 > > print(x) > [1] 1971 > > I'm stuck in reading from a file. I say: > > > A <- read.table(file="try") > > print(A) > V1 V2 > 1 1979-04-04 -1.04712042 > 2 1979-04-06 0.54538055 > 3 1979-04-09 0.09663392 > 4 1979-04-11 0.57119871 > 5 1979-04-12 0.73594112 > 6 1979-04-17 -1.54422087 > 7 1979-04-18 -0.20595691 > 8 1979-04-19 0.12700429 > 9 1979-04-20 0.42016807 > 10 1979-04-23 -1.46838241 > > I am confused - is V1 a number or a string? Looking at it, it must be > a string. But yet: > > > library(date) > > try=as.date(A$V1, "ymd") > Error in as.date(A$V1, "ymd") : Cannot coerce to date format > > In short, how do I parse in dates of the format yyyy-mm-dd (the ISO > 8601 format) or the yyyymmdd format. > > And if I may ask the next step: How do I tell R that I have a file > full of data all of which is time-series data, where V1 is the > datetime vector, and all the other columns are time-series, to do > things like ARMA models and ts plots with? > > -- > Ajay Shah Consultant > [EMAIL PROTECTED] Department of Economic Affairs > http://www.mayin.org/ajayshah Ministry of Finance, New Delhi > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
