Hi All, Is there some document/manual about data manipulation within R that I could use as a reference (obviously, aside the R manuals)?
The reason I am asking is that I have a number of data frames/matrices containg genetic data. The data is in a character form, as in: V1 V2 V3 V4 V5 1 AA AG AA GG AG 2 AC AA AA GG AG 3 AA AG AA GG AG 4 AA AA AA GG AG 5 AA AA AA GG AA I need, to chop, subset, and variously manipulate this kind of data, sometimes keeping the data in its character format, sometimes converting it to numeric form (i.e. substitute each data point with the equivalent factor value). Since the data is ofthe quite big, I have to keep things memory efficient. This whole game is getting excedingly time consuming and frustrating, because I end up with random pieces of code that I save, patching a particular problem, but difficult to be 'abstracted' for a new task, so I get back close to square one annoyingly often. Cheers, Federico Calboli -- Federico C. F. Calboli Department of Epidemiology and Public Health Imperial College, St Mary's Campus Norfolk Place, London W2 1PG Tel +44 (0)20 7594 1602 Fax (+44) 020 7594 3193 f.calboli [.a.t] imperial.ac.uk f.calboli [.a.t] gmail.com ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
