[R] Reformat a data frame

Dimitris Rizopoulos
Tue, 07 Nov 2006 13:05:20 -0000

try the following

df2 <- reshape(df1[-1], idvar = "id", direction = "long",
        timevar = "Param", times = c("resist",
"thick", "temp"),
        varying = list(c("resist", "thick",
"temp")))
df2 <- df2[order(df2$id, df2$desc), ]
rownames(df2) <- 1:nrow(df2)
df2


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message -----
From: "Thorsten Muehge" <MUEHGE at de.ibm.com>
To: <R-help at stat.math.ethz.ch>
Sent: Tuesday, November 07, 2006 10:10 AM
Subject: [R] Reformat a data frame


>
> Hello Experts,
> how do I reformat a data frame in the way described below:
>
>
> df1:
> ID    desc  resist      thick temp
> 1     4711  100   5     20
> 2     4712  101   4     21
> 3     4711  99    3     19
> 4     4712  98    7     22
>
> TO
>
> df2:
> id    desc  Param Value
> 1     4711  resist      100
> 1     4711  Thick 5
> 1     4711  temp  20
> 2     4712  resist      101
> 2     4712  Thick 4
> 2     4712  temp  21
> 3     4711  resist      99
> 3     4711  thick 4
> 3     4711  temp  19
> 4     4712  resist      98
> 4     4712  thick 7
> 4     4712  temp  22
>
> Thanks a lot for your help.
> With best regards
> Thorsten
>
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