Re: [Rd] 'sep' argument in reshape()
SW == Stephen Weigand weigand.step...@gmail.com on Tue, 31 Mar 2009 18:33:05 -0500 writes: SW I wonder if the 'sep' argument in reshape() is being ignored SW unintentionally: No. It is used much differently than you *assume* it's used. As always, ?reshape contains the answer. SW ## From example(reshape) SW df - data.frame(id=rep(1:4,rep(2,4)), SW visit=I(rep(c(Before,After),4)), SW x=rnorm(4), y=runif(4)) SW reshape(df, timevar=visit, idvar=id, direction=wide, sep = _) SW id x.Before y.Before x.After y.After SW 1 10.7730.293 -0.021 0.658 SW 3 2 -0.5180.351 -0.623 0.946 SW 5 30.7730.293 -0.021 0.658 SW 7 4 -0.5180.351 -0.623 0.946 SW Is this more of the intended result when 'sep = _'? SW id x_Before y_Before x_After y_After SW 1 10.7730.293 -0.021 0.658 SW 3 2 -0.5180.351 -0.623 0.946 SW 5 30.7730.293 -0.021 0.658 SW 7 4 -0.5180.351 -0.623 0.946 no it is not. I tend to agree that I would have preferred a different argument name than 'sep' for the current 'sep', and then a *further* argument 'sep' with the functionality that you'd like would be straightforward. Martin Maechler, ETH Zurich __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] 'sep' argument in reshape()
On Tue, 31 Mar 2009, Stephen Weigand wrote: I wonder if the 'sep' argument in reshape() is being ignored unintentionally: ## From example(reshape) df - data.frame(id=rep(1:4,rep(2,4)), visit=I(rep(c(Before,After),4)), x=rnorm(4), y=runif(4)) reshape(df, timevar=visit, idvar=id, direction=wide, sep = _) id x.Before y.Before x.After y.After 1 10.7730.293 -0.021 0.658 3 2 -0.5180.351 -0.623 0.946 5 30.7730.293 -0.021 0.658 7 4 -0.5180.351 -0.623 0.946 Is this more of the intended result when 'sep = _'? No. sep= is designed for going the other way. If you have wide-format data with variable names x.Before y.Before x.After y.After, using sep=. will let reshape() work out that the long-format variable names are x and y and the conditions to be put in the time variable are Before and After. -thomas Thomas Lumley Assoc. Professor, Biostatistics tlum...@u.washington.eduUniversity of Washington, Seattle __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] 'sep' argument in reshape()
I wonder if the 'sep' argument in reshape() is being ignored unintentionally: ## From example(reshape) df - data.frame(id=rep(1:4,rep(2,4)), visit=I(rep(c(Before,After),4)), x=rnorm(4), y=runif(4)) reshape(df, timevar=visit, idvar=id, direction=wide, sep = _) id x.Before y.Before x.After y.After 1 10.7730.293 -0.021 0.658 3 2 -0.5180.351 -0.623 0.946 5 30.7730.293 -0.021 0.658 7 4 -0.5180.351 -0.623 0.946 Is this more of the intended result when 'sep = _'? id x_Before y_Before x_After y_After 1 10.7730.293 -0.021 0.658 3 2 -0.5180.351 -0.623 0.946 5 30.7730.293 -0.021 0.658 7 4 -0.5180.351 -0.623 0.946 Thanks, Stephen -- Rochester, Minn. USA __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
