[R] plotting question

[Gabor Grothendieck]

Use reshape in the base of R or melt/cast in the reshape package.
Using the former:

Lines <- "ID  Year   V1
1   1980    1
1   1981    2
1   1982    6
1   1983    4
2   1980    5
2   1981    5
2   1982    5
2   1983    6"

# DF <- read.table("myfile.dat", header = TRUE)
DF <- read.table(textConnection(Lines), header = TRUE)
reshape(DF, dir = "wide", idvar = "ID", timevar = "Year")

gives for the posted data:

> reshape(DF, dir = "wide", idvar = "ID", timevar = "Year")
  ID V1.1980 V1.1981 V1.1982 V1.1983
1  1       1       2       6       4
5  2       5       5       5       6

On Sat, Mar 14, 2009 at 5:14 PM, David Kaplan
<dkaplan at education.wisc.edu> wrote:
> Greetings all,
>
> I have two questions.  I have a data set that is arranged in the example
> below.  I wish to obtain a plot of the performance of each ID over Year on
> v1.  It's not clear how I set this up?
> ID  Year   V1  1   1980    1  1   1981    2 1   1982    6
> 1   1983    4
> 2   1980    5
> 2   1981    5
> 2   1982    5
> 2   1983    6
>
> Also,I would like to transpose the data to have the variable across the
> columns such as
>
> ID   v1980   v1981 v1982 v1983
> 1       1       2      6   4
> 2       5       5      5   6
>
>
> Is there a straightforward way to do this in R?
>
> Thanks in advance,
>
> David
>
> --
> =======================================================================
> David Kaplan, Ph.D.
> Professor
> Department of Educational Psychology
> University of Wisconsin - Madison
> Educational Sciences, Room, 1061
> 1025 W. Johnson Street
> Madison, WI 53706
>
> email: dkaplan at education.wisc.edu
> homepage:
> http://www.education.wisc.edu/edpsych/default.aspx?content=kaplan.html
> Phone: 608-262-0836
>
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