Many thanks for the answers on my previous question, it got me started.
Indeed, stack() was the function I was vaguely remembering.
However, I didn¹t get very far because my data set is way more complicated
then I expected. In fact I have a mixture of levels and lists within a list.
Basically, it resemble the following list (named data) made of the levels H
and the list of lists A and T. for each level, the T[x]s are the same but
the A[x]s are different.
>H <- c(rep('H1',3),rep('H2',3),rep('H3',3))
> A <- list(A1=round(runif(3,100,1000)),
+ A2=round(runif(3,100,1000)),
+ A3=round(runif(3,100,1000)),
+ A4=round(runif(3,100,1000)),
+ A5=round(runif(3,100,1000)),
+ A6=round(runif(3,100,1000)),
+ A7=round(runif(3,100,1000)),
+ A8=round(runif(3,100,1000)),
+ A9=round(runif(3,100,1000))
+ )
> T1 <- round(runif(7,1,10))
> T2 <- round(runif(5,1,10))
> T3 <- round(runif(6,1,10))
> T <- list(T1,T1,T1,T2,T2,T2,T3,T3,T3)
> data <- list(H=H,A=A,T=T)
Basically, it can be represented as the following data structure:
H A T
H1 458 255 160 4 8 10 8 9 9 3
H1 343 424 298 4 8 10 8 9 9 3
H1 608 831 544 4 8 10 8 9 9 3
H2 616 266 413 7 3 5 4 5
H2 687 796 752 7 3 5 4 5
H2 814 921 228 7 3 5 4 5
H3 789 558 400 8 3 3 7 6 5
H3 845 298 855 8 3 3 7 6 5
H3 725 366 621 8 3 3 7 6 5
My goal is to get for each level of H a data frame of the value of As with
an indices representing what level of A it is coming and a single
representation of the Ts with a corresponding level. And so for every Hs. My
goal is to apply a linear model of value~ind for each H (of course, the data
are fake here) followed by an anova analysis for each H. Thus, for each
level of H I need something similar to:
$H1
value ind
458 A1
255 A1
160 A1
343 A2
424 A2
298 A2
608 A3
831 A3
544 A3
4 T
8 T
10 T
8 T
9 T
9 T
3 T
...
As you might have guess, we have several tens of thousand of Hs, thus, I
cannot just do it manually one at a time. I tried breaking down the problem
into small pieces but ended up not very far.
I was very excited when I got the following call to produce the expected
result:
> a <- tapply(data$A,data$H,function(x) stack(x))
> t <- tapply(data$T,data$H,function(x) x[1])
> tt <- lapply(t,function(x) data.frame(values=unlist(x),
+ ind=rep(1:length(x),sapply(x,length))))
>a
$H1
values ind
1 458 A1
2 255 A1
3 160 A1
4 343 A2
5 424 A2
6 298 A2
7 608 A3
8 831 A3
9 544 A3
...
> tt
$H1
values ind
1 4 1
2 8 2
3 10 3
4 8 4
5 9 5
6 9 6
7 3 7
...
However, I tried to rbind the list in a and tt (which represent the H level)
using lapply or sapply without any success.
I am in need of some guru advices on this one...
Also, I am not sure this is the most elegant want to produce the data
structure I am trying to build. Any advice?
Thanks
--
Marco Blanchette, Ph.D.
Assistant Investigator
Stowers Institute for Medical Research
1000 East 50th St.
Kansas City, MO 64110
Tel: 816-926-4071
Cell: 816-726-8419
Fax: 816-926-2018
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