[R] reshape with two time variables
jim holtman
jholtman at gmail.com
Sat Jan 31 01:56:26 CET 2009
This will work:
> x <- read.table(textConnection(" id A1B1 A1B2 A2B1 A2B2
+ 1 1 400 475 420 510
+ 2 2 390 500 470 472
+ 3 3 428 512 555 610
+ 4 4 703 787 801 822
+ 5 5 611 634 721 705
+ 6 6 543 522 612 788
+ 7 7 411 488 506 623
+ 8 8 654 644 711 795"), header=TRUE)
> closeAllConnections()
> require(reshape)
> x.m <- melt(x, id='id')
> x.m$A <- sub("A(\\d+).*", "\\1", x.m$variable, perl=TRUE)
> x.m$B <- sub(".*B(\\d+)", "\\1", x.m$variable, perl=TRUE)
> x.m$variable <- NULL
> x.m
id value A B
1 1 400 1 1
2 2 390 1 1
3 3 428 1 1
4 4 703 1 1
5 5 611 1 1
6 6 543 1 1
7 7 411 1 1
8 8 654 1 1
9 1 475 1 2
10 2 500 1 2
11 3 512 1 2
12 4 787 1 2
13 5 634 1 2
14 6 522 1 2
15 7 488 1 2
16 8 644 1 2
17 1 420 2 1
18 2 470 2 1
19 3 555 2 1
20 4 801 2 1
21 5 721 2 1
22 6 612 2 1
23 7 506 2 1
24 8 711 2 1
25 1 510 2 2
26 2 472 2 2
27 3 610 2 2
28 4 822 2 2
29 5 705 2 2
30 6 788 2 2
31 7 623 2 2
32 8 795 2 2
On Fri, Jan 30, 2009 at 6:57 PM, Neil Stewart
<neil.stewart at warwick.ac.uk> wrote:
> I have a data frame in wide format that I'd like to convert to long format.
> For example, in wide format I have:
>
> id A1B1 A1B2 A2B1 A2B2
> 1 1 400 475 420 510
> 2 2 390 500 470 472
> 3 3 428 512 555 610
> 4 4 703 787 801 822
> 5 5 611 634 721 705
> 6 6 543 522 612 788
> 7 7 411 488 506 623
> 8 8 654 644 711 795
>
> A is one repeated-measures variable with levels 1 and 2. B is a second
> repeated-measures variable also with levels 1 and 2. I'd like to end up
> with:
>
> id A B value
> 1 1 1 1 400
> 2 2 1 1 390
> 3 3 1 1 428
> 4 4 1 1 703
> 5 5 1 1 611
> 6 6 1 1 543
> 7 7 1 1 411
> 8 8 1 1 654
> 9 1 1 2 475
> 10 2 1 2 500
> 11 3 1 2 512
> 12 4 1 2 787
> 13 5 1 2 634
> 14 6 1 2 522
> 15 7 1 2 488
> 16 8 1 2 644
> 17 1 2 1 420
> 18 2 2 1 470
> 19 3 2 1 555
> 20 4 2 1 801
> 21 5 2 1 721
> 22 6 2 1 612
> 23 7 2 1 506
> 24 8 2 1 711
> 25 1 2 2 510
> 26 2 2 2 472
> 27 3 2 2 610
> 28 4 2 2 822
> 29 5 2 2 705
> 30 6 2 2 788
> 31 7 2 2 623
> 32 8 2 2 795
>
> I've been working with reshape and with the reshape package, but with no
> success for the two-time-variable case. Can anyone help please?
>
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
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