Or simply do : position <- as.numeric(trend1 == trend2 ) position
2011/2/24 Dimitris Rizopoulos <d.rizopou...@erasmusmc.nl> > there are also vectorized logical operators; have a look at the help page > ?'&', and try this: > > > trend1 <- c(1,1,1,1,1,1,-1,-1,-1,-1,-1,-1) > trend2 <- c(1,1,1,1,1,1,1,1,1,1,1,-1) > > position <- as.numeric((trend1 == 1 & trend2 == 1) | (trend1 == -1 & trend2 > == -1)) > position > > > I hope it helps. > > Best, > Dimitris > > > > On 2/24/2011 9:41 AM, Kushan Thakkar wrote: > >> I have two vectors: both have possible values of 1,-1, or 0 >> >> trend1<- c(1,1,1,1,1,1,-1,-1,-1,-1,-1,-1) >> trend2<- c(1,1,1,1,1,1,1,1,1,1,1,1,1,1,) >> >> i want to create a third vector that is conditional upon these two >> vectors: >> >> if (trend2 == 1&& trend1 == 1) {position<- 1} >> elseif (trend2 == -1&& trend1== -1) {position<- 1} >> else {position<- 0} >> >> based on this two conditions, the position vector should have a value: >> >> position: 1,1,1,1,1,1,0,0,0,0,0,0 >> >> Is there a way to do this in R without explicitly going through a for >> loop? >> The if condition doesn't work as it only accept one condition (aka no >> vectors). >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> >> > -- > Dimitris Rizopoulos > Assistant Professor > Department of Biostatistics > Erasmus University Medical Center > > Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands > Tel: +31/(0)10/7043478 > Fax: +31/(0)10/7043014 > Web: http://www.erasmusmc.nl/biostatistiek/ > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Kamel Gaanoun (+33) (0)6.76.04.65.77 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.