Hi James,
Thank you!
The thing is that I rather not have numbers 1 to 500, but for example:  
1, 100, 200, 300,400, 500. or something like this (so show a label  
only every 100 genes).
Thanks again,
Liat.
On 16.07.2012, at 16:24, James W. MacDonald wrote:

> row.names(yourmatrix) <- seq(1, nrow(yourmatrix),1)


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