I noticed that under R 2.6.0 there is a warning about closing the connection in the code from this post: https://stat.ethz.ch/pipermail/r-help/2007-September/140601.html
which is evidently related to the following from the NEWS file: o Connections will be closed if there is no R object referring to them. A warning is issued if this is done, either at garbage collection or if all the connection slots are in use. If we use read.table directly it still happens: # use Lines and Lines2 from cited post library(zoo) DF1 <- read.table(textConnection(Lines), header = TRUE) DF2 <- read.table(textConnection(Lines2), header = TRUE) z1 <- zoo(as.matrix(DF1[-1]), as.Date(DF1[,1], "%d/%m/%Y")) z2 <- zoo(as.matrix(DF2[-1]), as.Date(DF2[,1], "%d/%m/%Y")) both <- merge(z1, z2) plot(na.approx(both)) > R.version.string # Vista [1] "R version 2.6.0 alpha (2007-09-06 r42791)" Is this annoying warning really necessary? I assume we can get rid of it by explicitly naming and closing the connections but surely there should be a way to avoid the warning without going to those lengths. I would have thought that read.table opens the connection then it would close it itself so no warning would need to be generated. > # use Lines and Lines2 from cited post > library(zoo) > DF1 <- read.table(textConnection(Lines), header = TRUE) > DF2 <- read.table(textConnection(Lines2), header = TRUE) > z1 <- zoo(as.matrix(DF1[-1]), as.Date(DF1[,1], "%d/%m/%Y")) > z2 <- zoo(as.matrix(DF2[-1]), as.Date(DF2[,1], "%d/%m/%Y")) > both <- merge(z1, z2) > plot(na.approx(both)) Warning messages: 1: closing unused connection 4 (Lines2) 2: closing unused connection 3 (Lines) ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel