I hope you are doing well. For me, this was an unexpected problem. I've hoped for quite a few wrong things today, but I'm only asking you about this one. Why does
ifelse(1, list(a, b, c), list(x, y, z)) return a list with only a, not list(a, b, c) as I hoped. I wish it would either cause an error or return the whole list, not just the first thing. Working example: > x <- 1 > y <- 2 > z <- 3 > a <- 4 > b <- 5 > c <- 6 > list(x,y,z) [[1]] [1] 1 [[2]] [1] 2 [[3]] [1] 3 > list(a,b,c) [[1]] [1] 4 [[2]] [1] 5 [[3]] [1] 6 > ifelse(1, list(a,b,c), list(x,y,z)) [[1]] [1] 4 > ifelse(0, list(a,b,c), list(x,y,z)) [[1]] [1] 1 > sessionInfo() R version 2.15.3 (2013-03-01) Platform: x86_64-pc-linux-gnu (64-bit) locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=C LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] rockchalk_1.5.5.10 car_2.0-16 nnet_7.3-5 MASS_7.3-23 loaded via a namespace (and not attached): [1] compiler_2.15.3 tools_2.15.3 I realize I can code around this, but I'm just curious about why ifelse hates me so much :( > if (1) myvar <- list(a, b, c) else myvar <- list(x, y, z) > myvar [[1]] [1] 4 [[2]] [1] 5 [[3]] [1] 6 > myvar <- if (1) list(a, b, c) else list(x, y, z) > myvar [[1]] [1] 4 [[2]] [1] 5 [[3]] [1] 6 -- Paul E. Johnson Professor, Political Science Assoc. Director 1541 Lilac Lane, Room 504 Center for Research Methods University of Kansas University of Kansas http://pj.freefaculty.org http://quant.ku.edu ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
