[R] list to array

[Maciej.Hoffman-Wecker@evotecoai.com]

Hello everybody!

I have a problem, that might be a quite common one.

Often one has some statistics on subpopulations defined by several factors.
This is usualy done by tapply resulting in a list.

For presentation-tasks, the form of an array might be more advantageos,
as ftable in combination with aperm allows for quite nice print.
Moreover some html or ps output might be easier to produce.

So this is the question: How can i transform a list of the form

list $a1  $b1  = x1
          $b2  = x2
     $a2  $b1  = x3
          $b2  = x4

into an multy-way array, with each list-level defining a dimension of the
array:

array[a1:a2 , b1:b2]

Maybe someone has already spend some time on this.
I would be pleased about some hints.

Maciej



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