Try this: Lines <- '1 2 0.1 2 3 0.2 3 1 0.3'
DF <- read.table(textConnection(Lines)) m <- matrix(0, ncol = nrow(DF), nrow = nrow(DF)) m[as.matrix(DF[1:2])] <- DF[[3]] On Tue, Aug 10, 2010 at 3:03 PM, zhenjiang xu <zhenjiang...@gmail.com>wrote: > Hi, > > I have a file like this: > 1 2 0.1 > 2 3 0.2 > 3 1 0.3 > > And I want to read it to create a matrix like this: > [,1] [,2] [,3] > [1,] 0 0.1 0 > [2,] 0 0 0.2 > [3,] 0.3 0 0 > > How can I do it efficiently? Thanks. > -- > Best, > Zhenjiang > > [[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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[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.
