Hi to everybody, i have a little problem with some values: when I type: tmp <- read.table("tottimecourse.txt", sep="\t", header=T, na.strings = "") some data appear with "NA" value.....: [232] -1.64 -0.98 -0.48 -2.18 -0.41 0.07 0.03 NA -1.17 -0.70 -1.80 -0.95 -0.74 -0.66 -0.33 NA NA NA NA NA NA [253] NA NA NA NA NA NA NA NA -0.65 0.84 -0.59 0.01 -0.16 -0.71 NA NA NA NA NA NA NA [274] NA NA NA NA NA NA NA NA NA NA N how can i apply a function in order to transfor "NA" with 0 ? best wishes Dr Alberto Goldoni Medical Genetics Unit S. Orsola-Malpighi Hospital Via Massarenti n.9, Pad 11 40100 Bologna, Italy Mobile Phone: +39-338-4145970 Fax: +39-051-636-4004 alberto.goldoni at eurogene.org www.eurogene.org www.lagem.it

Alberto Goldoni wrote: > tmp <- read.table("tottimecourse.txt", sep="\t", header=T, >na.strings = "") > >some data appear with "NA" value.....: > > >[232] -1.64 -0.98 -0.48 -2.18 -0.41 0.07 0.03 NA -1.17 -0.70 -1.80 >-0.95 -0.74 -0.66 -0.33 NA NA NA NA NA NA >[253] NA NA NA NA NA NA NA NA -0.65 0.84 -0.59 >0.01 -0.16 -0.71 NA NA NA NA NA NA NA >[274] NA NA NA NA NA NA NA NA NA NA N > > >how can i apply a function in order to transfor "NA" with 0 ? > If you want to replace "NA" with 0, the following might work: > tmpIsNA = is.na(tmp) > newTmp = tmp > newTmp[tmpIsNA] = 0 Best, Saroj