[BioC] taking the median across similar data

[Sean Davis]

On Wed, Feb 24, 2010 at 8:27 PM, Harikrishnadhar <hari.bombex at gmail.com> wrote:
> Dear All,
>
> I am analyzing the miRNA data set in which I have 817 unique probes for each
> they have 20  features each . I have to group the similar features and take
> the median across them so that I have a data with no repeats to perform
> invariant analysis .
>
> My data looks something  similar format
>
> probename  sample1 sample2 sample3
> A                 2.3          2.4        2.5
> A                 8.9          3.6        7.9
> A                 4.7           4.4       2.2
> C                 2.2           2.1       2.3
> C                 1.3           1.3       2.9
> B                 2.2            2.1      2.7
> B                 2.2            2.1      2.8
>
> I have to group the probename  elements and and get median across them.
> Please help with this so that I can get complete my analysis .

Hi, Hari.

To answer your question directly, have a look at the aggregate()
function.  That said, I'm not sure where you are headed with your
analysis....

Sean