Blog Archives

command line options in R: "optparse" package

February 8, 2011
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C/python style option parsing now available in R with "optparse" package. Check the documentation here and see below to see how it [email protected] scripts $ Rscript filter.transcripts.by.ncRNA.R -husage:  usage: filter.transcripts.by.ncRNA.R [op...

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sqldf and grouping rows in R

February 8, 2011
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In R, you can treat tables (or data.frames as they are called in R) as SQL tables. That means you can query them as you would query a database with SQL commands. This is particularly useful 1) if you know SQL, hahah:)  2) if you have large tabl...

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Principal Component Analysis: Which variables contribute most to principal components ?

November 23, 2010
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Principal component analysis (PCA) is a mathematical transformation of possibly(correlated) variables into a number of uncorrelated variables called principal components. The resulting components from this transformation is defined in such a way that t...

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