[R] split list

[Martin Morgan]

On 03/29/2012 08:18 AM, konika chawla wrote:
> Hi
> Is there a function like splitstr, for splitting lists?
> I want to divide a list of gene names based on a recurring value like
> "batch"
> the list is like
>
> [1,] "AT4G25480"
> [2,] "AT3G20810"
> [3,] "AT2G46670"
> [4,] "AT4G27310"
> [5,] "batch"
> [6,] "AT1G04570"
> [7,] "AT5G62360"
> [8,] "AT2G31380"
> [9,] "AT3G54500"
> [10,] "AT2G36220"
> [11,] "batch"
> [12,] "AT5G06980"
> [13,] "AT2G46790"
> [14,] "AT3G55580"
> [15,] "AT1G73480"
> [16,] "AT5G54470"
> [17,] "AT1G07180"
> I want to split it in three gene lists, and remove the "batch"

Hi --

along the lines of

   split(v, cumsum(v == "batch"))

where the first element of all groups except the first will be "batch", 
and would need to be filtered.

    Map(function(elt) if (elt[1] == "batch") elt[-1] else elt,
        split(v, cumsum(v == "batch")))

Martin

> Any ideas?
> Thanks
> Konika
>
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