[R] data.frame manipulation: Unbinding strings in a row

[francogrex]

Hi all,

I have a data.frame I received with data that look like this (comma
separated strings in last row):

ID	Shop	Items
ID1	A1	item1, item2, item3
ID2	A2	item4, item5
ID3	A1	item1, item3, item4


But I would like to unbind the strings in col(2) items so that it will look
like this:

ID	Shop	Items
ID1	A1	item1
ID1	A1	item2
ID1	A1	item3
ID2	A2	item4
ID2	A2	item5
ID3	A1	item1
ID3	A1	item3
ID3	A1	item4

Meaning each item is on a different row but still maintain the ties with the
IDs and the Shops. 
The final purpose is to count how many times a particular item has been
bought in a particular shop, like:

item1-A1= 2
item2-A1=1
item3-A1=2


Any ideas? Thanks


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