[BioC] removeing or filtering data

James W. MacDonald jmacdon at med.umich.edu
Fri Jun 15 21:29:44 CEST 2007

> hi,
> I have a matrix where I would like to remove
> certain values below a threshold.
> is there an easy way to do that?
> like repalcing values <100
> another value, lets say 100,
> in an array?

Both of your questions today indicate a lack of knowledge about the 
fundamental aspects of working with R. That's fine, as everybody has to 
start somewhere.

However, all of these subjects are covered in 'An Introduction to R', 
which ships with all versions of R, and is also available on the 
R-project website. In addition, this is the Bioconductor list, which is 
supposed to be dedicated to questions concerning Bioconductor packages 
rather than basic R questions.

So please read 'An Introduction to R'. It really is worthwhile. Also, 
please read the BioC posting guide:


As well as the R-help posting guide:




> are we supposed to use the apply function?
> Thanks
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James W. MacDonald, M.S.
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

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