You might consider using the zoo package since it handles all this
automatically:
library(zoo)
z <- read.zoo("Data.txt", format = "%d/%m/%Y", header = TRUE)
plot(z)
plot(diff(log(z)))
There are 3 vignettes that come with zoo with more info.
On Mon, Feb 25, 2008 at 5:39 PM, Khadija Mohammedali <[EMAIL PROTECTED]> wrote:
>
> Hi Jim
>
> Thank you for your quick response. This worked great. I am having the same
> problem again. I have moved on to calculating returns from rates and want to
> plot returns on the y axis and again dates on the x axis. The code I am using
> to calculate returns is as follows:
> rate<-x$Rate
> returns<-(diff(log(rate)))
> If I do:
> plot(returns, type="l") I get the graph I want however am having problems
> with the x axis again. Modification of the code below doesnt work as I now
> have one less dimension in returns. Hope I am making sense. Your help is
> much appreciated.
> > Date: Mon, 25 Feb 2008 16:32:44 -0500> From: [EMAIL PROTECTED]> To: [EMAIL
> > PROTECTED]> Subject: Re: [R] Graph Axis> CC: r-help@r-project.org> > You
> > have to convert you date to be a Date class:> > x <-
> > read.table("/tempxx.txt", header=TRUE, as.is=TRUE)> x$Date <-
> > as.Date(x$Date, "%d/%m/%Y")> plot(x$Date, x$Rate, type='l')> > > On
> > 2/25/08, Khadija Mohammedali <[EMAIL PROTECTED]> wrote:> >> > Hi I have
> > data of exchange rates and time, and am trying to draw a graph that will
> > show the rates on the y axis and dates on the x axis. I am using the
> > following code: plot(rate, type='l', xlab='Date', ylab='Rate', main='£ to
> > Euro rate over 5 years')This gives me the graph I want although I want to
> > display the dates on the x axis, even if its just 2002, 2003,...2008.
> > Attached is my data. Hope you can help.> >
> > _________________________________________________________________> >
> > [[elided Hotmail spam]]> >> >> >
> > ______________________________________________> > R-help@r-project.org
> > mailing list> > https://stat.ethz.ch/mailman/listinfo/r-help> > PLEASE do
> > read the posting guide http://www.R-project.org/posting-guide.html> > and
> > provide commented, minimal, self-contained, reproducible code.> >> >> >> >
> > > -- > Jim Holtman> Cincinnati, OH> +1 513 646 9390> > What is the problem
> > you are trying to solve? Tell me what you want to> do, not how you want to
> > do it.
> _________________________________________________________________
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> ______________________________________________
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>
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