[R] list of lists question

[Spencer Graves]

      Is the following more like what you want: 


a=c(1,1,1,1,1)                  # generate the first list
b=c(2,2,2)                        # generate a second list
d=list(a,b)                        # make a list of a and b
(
e=c(d,a)
 )
[[1]]
[1] 1 1 1 1 1

[[2]]
[1] 2 2 2

[[3]]
[1] 1

[[4]]
[1] 1

[[5]]
[1] 1

[[6]]
[1] 1

[[7]]
[1] 1

      If no, have you read sec. 6 in "An Introduction to R" [the first 
option available from help.start()]? 

      In this example, note that e[1] is a list with only one 
attributes, namely the vector 1 1 1 1 1;  e[[1]] is not a list but that 
vector itself. 

      hope this helps.  spencer graves

Karla Sartor wrote:

> Hello all,
> As a general programming question I can't seem to figure out how to 
> make a list of lists in R.
> As matrices won't work as they have to be rectangular.
>
> I am sure that there is an easy solution but...
>
> the specific situation is this:
> - I have created a Tukey confidence interval table and have listed the 
> means that are not significantly different
> - then using these not significantly different pairs I have created 
> the groups of means that are not significantly different from each other
> the issue then is that many of these lists are subsets of other lists 
> and I need to check for this.
>
> Below is a little program is illustrate the issue
>
> > a=c(1,1,1,1,1)                  # generate the first list
> > b=c(2,2,2)                        # generate a second list
> > c=c(a,b)                           #combine them
> > cat(c, "\n")                        # and print
> 1 1 1 1 1 2 2 2                   #  this is 1-D!!! ahh
> > d=list(a,b)                        # make a list of a and b
> > d                                       #  and print
> [[1]]                                      #this is exactly what I 
> want, but continue
> [1] 1 1 1 1 1
>
> [[2]]
> [1] 2 2 2
>
> > e=list(d,a)                           # now on the next iteration I 
> need to add another list to this list of lists
> > e                                         # and print
> [[1]]                                       # ahh all hell has broken 
> loose and this is not what I want
> [[1]][[1]]                               #  desired result below
> [1] 1 1 1 1 1
>
> [[1]][[2]]
> [1] 2 2 2
>
>
> [[2]]
> [1] 1 1 1 1 1
>
> -------------
> desired result
>
> #wrong code but this is what I want to happen
> a=c(1,1,1,1,1,1,1)
> for(i in 1:5) {
>    a=list(a,1:5)
> }
>
> output I want is (something like)
> [1] 1 1 1 1 1 1 1
> [2] 1 2 3 4 5
> [3] 1 2 3 4 5
> [4] 1 2 3 4 5
> [5] 1 2 3 4 5
> [6] 1 2 3 4 5
>
> so then I could call cat(a[1]) and get 1 1 1 1 1 1 1 1 and cat(a[2]) 
> and get 1 2 3 4 5
>
> Anyone know the answer (hopefully simple)
>
> Cheers,
>
> Karla Sartor
>
>
>
> ----------------------------------------------------------
> Karla Sartor
> Montana State University - LRES
> ksartor at montana.edu
>
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-- 
Spencer Graves, PhD, Senior Development Engineer
O:  (408)938-4420;  mobile:  (408)655-4567