splitting ff_vectors in r

Question

Is there a way to perform a basic split of ff_vectors without any sums or such things? I have a ffdf called res2 consisting of 2 ff_vectors, and I want the following, from a ffdf like this:

A     B
a     1
a     2
b     4
b     5        

result should be a list like with the use of split function:

$a 
1 2

$b
4 5

I want to create transactions out of these stuff and perform analysis on them, but I require to organize my data correctly first.

Answer 1

You can try,

split(df[, 'B'], df[,'A'])

which would give

#$a
#[1] 1 2

#$b
#[1] 4 5