[BioC] Concordance correlation coefficient and data manipulation

[John Herbert]

Hi All.  
I want to compare array expression data between arrays and samples of similar test conditions.
My data contains NaN and inf values and I want to remove these so they are not included in the tests. How is best to do this?
I am a Perl-er and new to R, there does not seem an easy way to do it with subset or grep. 

Any advice appreciated. I wrote my own concordance routine but there could be a good one in a package somewhere? I am using Agilent single colour data. 

Thanks a lot for any advice.  

John.