# [R] Time series plot

Petr Pikal petr.pikal at precheza.cz
Thu Jan 4 12:49:55 CET 2007

```Hi

On 4 Jan 2007 at 14:18, Arun Kumar Saha wrote:

Date sent:      	Thu, 4 Jan 2007 14:18:11 +0530
From:           	"Arun Kumar Saha" <arun.kumar.saha at gmail.com>
To:             	"Gabor Grothendieck" <ggrothendieck at gmail.com>
Copies to:      	"r-help at stat.math.ethz.ch" <R-help at stat.math.ethz.ch>
Subject:        	Re: [R] Time series plot

> Dear Gabor,
>
> Thank you very much for your letter. Actually I got partial solution
> from your suggestion. Still I am fighting with defining a secondary
> axis. More pecisely, suppose I have following two dataset:
>
> x = c(1:10)
> y = x*10
>
> To plot x I can simply write plot(x, type='l'), here the"y-axis" takes
> value from 1:10. Now I want to plot y on a Secondary "Y-axis" on same

I think you are lost a bit in plotting
let's
x be
x<-rnorm(10)
and
y<-x*10

then
gives you x values on y axis and x axis is 1:10. You can put another
values y on the same plot but only if you give them space before

plot(x, type="l", ylim=range(y))
points(y)
but it is probably not what you want.

If you want to plot time series to get time labels on x axis then
Gabor's solution would be perfectly valid.

Or you can convert your date (which is probably factor) to real time.

> tab
date    price
1   1-Jan-02 4.880375
2   2-Jan-02 4.879843
3   3-Jan-02 4.884013
4   4-Jan-02 4.880375
5   5-Jan-02 4.874968
6   6-Jan-02 4.875426
7   7-Jan-02 4.874663
8   8-Jan-02 4.875350
9   9-Jan-02 4.888242
10 10-Jan-02 4.889522
11 11-Jan-02 4.887111

tab\$newdate <- as.POSIXct(strptime(tab\$date, format="%d-%b-%y"))

> str(tab)
'data.frame':   11 obs. of  3 variables:
\$ date   : Factor w/ 11 levels "1-Jan-02","10-Jan-02",..: 1 4 5 6 7
8 9 10 11 2 ...
\$ price  : num  4.88 4.88 4.88 4.88 4.87 ...
\$ newdate:'POSIXct', format: chr  "2002-01-01" "2002-01-02" "2002-01-
03" "2002-01-04" .

plot(tab\$newdate, tab\$price)

what is what you may want without explicit need for secondary y axis.

HTH
Petr

> graphics window. Secondary y-axis will take value from 1:100 and plot
> y accordingly, just like Microsoft Excel. Is there any solution?
>
> Thanks and regards,
>
>
>
>
>
> On 1/4/07, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> >
> > You can use read.zoo in the zoo package to read in the data
> > and then see:
> >
> > https://www.stat.math.ethz.ch/pipermail/r-help/2006-December/122742.
> > html
> >
> > See ?axis for creating additional axes with classic graphics and
> >
> > library(lattice)
> > ?panel.axis
> >
> > in lattice graphics.  Search the archives for examples.
> >
> > On 1/4/07, Arun Kumar Saha <arun.kumar.saha at gmail.com> wrote:
> > > Dear all R users,
> > >
> > > Suppose I have a data set like this:
> > >
> > > date              price
> > >
> > > 1-Jan-02     4.8803747
> > > 2-Jan-02     4.8798430
> > > 3-Jan-02     4.8840133
> > > 4-Jan-02     4.8803747
> > > 5-Jan-02     4.8749683
> > > 6-Jan-02     4.8754263
> > > 7-Jan-02     4.8746628
> > > 8-Jan-02     4.8753500
> > > 9-Jan-02     4.8882416
> > > 10-Jan-02     4.8895217
> > > 11-Jan-02     4.8871108
> > >
> > > I want to get a time series plot of that dataset. But in x-axis I
> > > want
> > to
> > > see the first day, and last day, and other day in between them
> > > i.e. 1-Jan-02,  6-Jan-02, and  11-Jan-02 only. Can anyone tell me
> > > how to do
> > that?
> > >
> > > My second question is that is there any way to define a secondary
> > > axis
> > like
> > > Microsoft Excel in the same plot window?
> > >
> > > Thanks and regards,
> > > Arun
> > >
> > >        [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > http://www.R-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained, reproducible code.
> > >
> >
>
>  [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> http://www.R-project.org/posting-guide.html and provide commented,
> minimal, self-contained, reproducible code.

Petr Pikal
petr.pikal at precheza.cz

```