Does not just polyList[[1]])[1, 1] <- 5 work?
--- On Tue, 7/8/08, Stephane Bourgeois <[EMAIL PROTECTED]> wrote: > From: Stephane Bourgeois <[EMAIL PROTECTED]> > Subject: [R] attributing values to dataframe positions following eval > To: r-help@r-project.org > Received: Tuesday, July 8, 2008, 5:40 AM > Hi everybody, > > > > I've been looking around, but can't seem to find > the answer. > > > > I get a list of names (which vary, so I never know them in > advance), and > transform them into variables, each of which is a > dataframe, using > assign: > > > > polyList <- c("rs123", "rs124", > "rs555", "rs000") > > numPoly <- length(polyList) > > > > for (k in 1:numPoly) { > > assign(polyList[k], data.frame(matrix(NA, ncol=3, > nrow=3))) > > } > > > > polyList <- lapply(polyList, as.name) > > > > I can see the resulting dataframe associated to rs123 (for > example) > using: > > > > > eval(polyList[[1]]) > > X1 X2 X3 > > 1 NA NA NA > > 2 NA NA NA > > 3 NA NA NA > > > > And see the value in row 1, column 1 with: > > > > > eval(polyList[[1]])[1,1] > > [1] NA > > > > Now, I want to change the values in the dataframe... > that's what I can't > manage to do: > > > > > eval(polyList[[1]])[1,1] <- 5 > > Error in eval(polyList[[1]])[1, 1] <- 5 : > > could not find function "eval<-" > > > > Anybody has an idea on how to do that? > > > > Thank you, > > > > Stephane > > > > PS: yes, I'm aware that using arrays and dataframes > instead of going > through the creation of variables may be more practical, > but the context > is much more complex than the presented example (and in > that specific > case, having these variables is a requirement) > > > > > > > -- > The Wellcome Trust Sanger Institute is operated by Genome > Research > > Limited, a charity registered in England with number > 1021457 and a > compa > ny registered in England with number 2742969, whose > registered > office is 2 > 15 Euston Road, London, NW1 2BE. > > > > [[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. ______________________________________________ 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.