[R] how to do calculations in data matrices?
Zoppoli, Gabriele (NIH/NCI) [G]
zoppolig at mail.nih.gov
Sat Feb 13 18:39:04 CET 2010
Please give me just a reference where I can find something useful.
In summary, I need to :
- find the median of each row of a matrix
- create a new matrix with each value in the first matrix divided by the median of its row
- if a value "a" in the second matrix is < 1, I need to substitute it with 1/a
I know that for some of you it must be overeasy, but I swear I googled for two hours with keywords "operations", "calculations", "data matrices", "data tables", and "CRAN", and I didn't find anything useful.
Thank you all
Gabriele Zoppoli, MD
Ph.D. Fellow, Experimental and Clinical Oncology and Hematology, University of Genova, Genova, Italy
Guest Researcher, LMP, NCI, NIH, Bethesda MD
Email: zoppolig at mail.nih.gov
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