[R] problems with plot.data.frame
jim holtman
jholtman at gmail.com
Thu Aug 31 18:52:34 CEST 2006
Convert the column with the months to an actual date. I am going to
assume this is all the same year, so try this:
> x <- read.table('clipboard', as.is=T)
> x
V1 V2 V3 V4
1 jan 3 1 7
2 mar 2 4 2
3 may 1 3 2
4 jul 3 7 4
5 sep 5 2 3
6 nov 3 1 5
> x$Date <- as.POSIXct(strptime(paste(x$V1, '1 2006'), format='%b %d %Y'))
> x
V1 V2 V3 V4 Date
1 jan 3 1 7 2006-01-01
2 mar 2 4 2 2006-03-01
3 may 1 3 2 2006-05-01
4 jul 3 7 4 2006-07-01
5 sep 5 2 3 2006-09-01
6 nov 3 1 5 2006-11-01
> plot(x$Date, x$V2)
>
On 8/31/06, Monica Pisica <pisicandru at hotmail.com> wrote:
> Hi list,
>
> I have a question about 'plot'. I am trying to plot values registered every
> month - or every other month. If i build a data.frame called mydata like
> this (as an example)
>
> jan 3 1 7
> mar 2 4 2
> may 1 3 2
> jul 3 7 4
> sep 5 2 3
> nov 3 1 5
>
> and use the command line:
>
> plot(mydata[c(1,3)])
>
> I get a graph that has on the x axis my months in alphabetical order - which
> i don't want, and instead of points i have thick horizontal lines. I've
> tried everything i could and understood from the R help files to give me
> points and on x axis the month in my order instead of alpha order. No
> success. What is the trick?
>
> I fixed the month order by using numerals in front of them like 01, 03, ...
> etc, but this is not an elegant solution.
>
> Any help will be much appreciated.
>
> Monica
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
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