[R] making array of lists

From: Vadim Organovich <vogranovich_at_jumptrading.com>
Date: Mon, 03 Mar 2008 19:21:26 -0600


Dear R Users,

Given two vectors, say a = seq(2) and b = seq(3), I want to make an 2*3 array, where (i,j) element is list(a=a[i], b=b[j]). I tried the outer() function but it generates an error message that I don't understand, see below.

What do I do wrong?

The expan.grid function is not good enough since I need a solution that works when a and b are not atomic, say a=list(list(x=1, y=2), list(x=2, y=1)).

Thanks,

Vadim

> a <- seq(2); b <- seq(3)
> outer(a, b, function(a, b) list(a=a, b=b))
Error in dim(robj) <- c(dX, dY) :
  dims [product 6] do not match the length of object [2]

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