[R] Permutations of configurations on multiple columns

[R. Michael Weylandt]

So I've been puzzling on this for a week or so and don't see any
elegant way to do it. I'd imagine there's a nifty way to do it using
ddply() in conjunction with some melt() tools to get it all in one
data frame (or just possibly mapply() after converting the "iN"
factors to characters to make sure they get matched properly), but I'm
going to try to bump it to see if anyone else can give you a good
solution.

Michael

On Fri, Sep 30, 2011 at 7:18 AM, Metronome123 <lars.hulzebos at gmail.com> wrote:
>
> Michael Weylandt wrote:
>>
>> I'm not entirely sure how these two objects are related. Perhaps give a
>> little more information on the transform and we can help with
>> implementation...
>>
>
> Ok, I have got 2 matrices [P,I] and [I,E].
>
> testcontents [P,I]:
> structure(list(P = structure(c(1L, 1L, 1L, 2L, 2L, 3L, 3L), .Label = c("p1",
> "p2", "p3"), class = "factor"), I = structure(c(1L, 2L, 3L, 1L,
> 4L, 5L, 6L), .Label = c("i1", "i2", "i3", "i4", "i5", "i6"), class =
> "factor")), .Names = c("P",
> "I"), class = "data.frame", row.names = c(NA, -7L))
>
> testcontents [I,E]:
> structure(list(I = structure(c(1L, 1L, 2L, 3L, 3L, 4L, 5L, 6L,
> 6L), .Label = c("i1", "i2", "i3", "i4", "i5", "i6"), class = "factor"),
>    E = structure(1:9, .Label = c("e11", "e12", "e21", "e31",
>    "e32", "e41", "e51", "e61", "e62"), class = "factor")), .Names = c("I",
> "E"), class = "data.frame", row.names = c(NA, -9L))
>
> I want to create a matrix [P,C,E] where c is one of all unique vectors C
> within P of one combination of I selected from all possible values in the
> [I,E] matrix.
> Note that for each i there can be a different number of e's. I tried to add
> indices in the testcontent to make the aim more clear.
>
> So the result of the [P,C,E] matrix should be something like:
> structure(list(P = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
> 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
> 2L, 2L, 2L, 2L), .Label = c("p1", "p2"), class = "factor"), C =
> structure(c(1L,
> 1L, 1L, 2L, 2L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 5L, 5L, 5L, 5L, 6L,
> 6L, 6L, 6L, 7L, 7L, 7L, 7L, 8L, 8L, 8L, 8L), .Label = c("c11",
> "c12", "c13", "c14", "c21", "c22", "c23", "c24"), class = "factor"),
>    E = structure(c(1L, 3L, 4L, 2L, 3L, 4L, 1L, 3L, 5L, 2L, 3L,
>    5L, 1L, 6L, 7L, 8L, 2L, 6L, 7L, 8L, 1L, 6L, 7L, 9L, 2L, 6L,
>    7L, 9L), .Label = c("e11", "e12", "e21", "e31", "e32", "e41",
>    "e51", "e61", "e62"), class = "factor")), .Names = c("P",
> "C", "E"), class = "data.frame", row.names = c(NA, -28L))
>
> Hopefully it is more clear now.
>
> Cheers, Lars
>
> --
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