reshape data.frame
You can use the reshape() in core R (the stats package)
reshape(a, timevar="year", idvar="name", direction="wide")
name amount.1971 amount.1972 amount.1973 amount.1974 1 a 1 2 3 4 11 b 11 12 13 14 amount.1975 amount.1976 amount.1977 amount.1978 1 5 6 7 8 11 15 16 17 18 amount.1979 amount.1980 amount.1981 amount.1982 1 9 10 NA NA 11 19 20 21 22 amount.1983 amount.1984 amount.1985 1 NA NA NA 11 23 24 25 (Was naming the output columns "X.<year>" instead of "amount.<year>" important?) Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Trevor Davies
Sent: Friday, November 18, 2011 4:05 PM
To: r-help at r-project.org
Subject: [R] reshape data.frame
A late friday afternoon coding question. I'm having a hard time thinking
of the correct search terms for what I want to do.
If I have a df like this:
a <-
data.frame(name=c(rep('a',10),rep('b',15)),year=c(1971:1980,1971:1985),amount=1:25)
name year amount
1 a 1971 1
2 a 1972 2
3 a 1973 3
4 a 1974 4
5 a 1975 5
6 a 1976 6
7 a 1977 7
8 a 1978 8
9 a 1979 9
10 a 1980 10
11 b 1971 11
12 b 1972 12
13 b 1973 13
14 b 1974 14
15 b 1975 15
16 b 1976 16
17 b 1977 17
18 b 1978 18
19 b 1979 19
20 b 1980 20
21 b 1981 21
22 b 1982 22
23 b 1983 23
24 b 1984 24
25 b 1985 25
and I'd like to reshape it so it is like this:
X.1971 X.1972 X.1973 X.1974 X.1975 X.1976 X.1977 X.1978 X.1979 X.1980
X.1981
a 1 2 3 4 5 6 7 8 9 10
NA
b 11 12 13 14 15 16 17 18 19 20
21
X.1982 X.1983 X.1984 X.1985
a NA NA NA NA
b 22 23 24 25
Thanks for the assist.
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