[R] How to 'understand' R functions besides reading R codes

Apologize for not being clearer earlier. I would like to ask again. Thank Joris and Markleeds for response. Two examples: 1. Function 'var'. In R, it is the sum of square divided by (n-1) but not by n. (I know this in R class) 2. Function 'lm'. In R, it is the residual sum of square divied by

Re: [R] How to 'understand' R functions besides reading R codes

There is: 1) read the help files 2) read the vignette (see ?vignette ) 2) look up at www.rseek.org 3) check google 4) look at the references mentioned in the help files (or do first if you're not familiar with the method) 5) ask here If still nothing : use another function/method. Cheers Joris