[BioC] Finding all combinations from groups

[Joern Toedling]

Hi Daniel,

try:
expand.grid(1, 5:7, 2:3)

Regards,
Joern


Daniel Brewer wrote:
> Hi,
>
> I have five groups (of genes) with each group having different number of
> members.  What I need to do is to apply a function to a set that
> contains one gene from each group.  I would like to do this for every
> possible set.
>
> For example,
>
> Groups
> 1: 1
> 2: 5 6 7
> 3: 2 3
>
> I would like to apply the function to:
> 1,5,2
> 1,5,3
> 1,6,2
> 1,6,3
> 1,7,2
> 1,7,3
>
> This has come up in pathway analysis (gene enrichment analysis) where I
> want to look at a number of different isoforms of each gene.
>
> Does anyone know a way to get these combinations?
>
> Thanks
>
> Dan
>
>