search for: frasi

Dear all, I'm quite new in R and I have a problem with the function which. When I use it to select a subset of a dataframe it works well but somewhere R takes trace of the past dataframe and this creates problems with following operations. For example: sentences <- read.xls("frasi.tot.march.3.xls", header=TRUE) head(sentences) fam subjID Cond Code reg total first second 1 f 30 an fDan1 1 0.2812500 0.2812500 0.0000000 2 f 30 an fDan1 2 1.7851562 0.5390625 1.2460938 3 f 30 an fDan1 3 1.2304688 0.6679688 0.5625000 4 f 30...