[R] How to log-2 transform a matrix

[Ben Bolker]

affy snp wrote:
> 
> Hi Ted,
> 
> My matrix looks like:
> 
>> dim(CGH)
> [1] 238304    243
>> CGH[1:30,1:4]
>               WM806SignalA WM1716SignalA WM1862SignalA WM1963SignalA
> SNP_A-1909444         1.59          1.48          1.78          2.59
> SNP_A-2237149         2.24          1.87          1.95          2.04
> SNP_A-4303947         2.02          1.70          1.90          2.36
> SNP_A-2236359         2.58          2.06          1.87          2.15
> SNP_A-2205441         1.87          1.46          1.86          2.40
> 
> 

   As others have commented, the problem seems to be with CGH
and not with log2().  str(CGH) should give you more information 
about what R thinks CGH is. 

  Did you forget to set header=TRUE when reading the data in?

  Ben Bolker

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