[BioC] heatmap for high number of genes

[Steve Lianoglou]

Hi,

On Tue, Mar 2, 2010 at 5:07 PM, avehna <avhena at gmail.com> wrote:
> Hi Steve:
>
> Thank you so much for your message.
>
> Yes, I'm using "heatmap.2" to display my genes. Do you know about any
> function in R to rearrange a matrix based on the "high to low"-ordering of
> just one column (treatment)?

You should look at the "order" function.
Type "?order" at the R prompt (w/o the quotes).

If your second column is your treatment column, then something like:

o <- order(X[,2], decreasing=TRUE)
X <- X[o,]

Now the rows of X will be reordered by decreasing order (from column 2).

-steve

-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact