4 messages · Dimitri Liakhovitski, PIKAL Petr, Duncan Mackay
Hello! I have my data frame x with 2 character columns: x <- data.frame(a = numeric(), b = I(list())) x[1:3,"a"] = 1:3 x[[1, "b"]] <- "a, b, c" x[[2, "b"]] <- "d, e" x[[3, "b"]] <- "f" x$a = as.character(x$a) x$b = as.character(x$b) x str(x) I need to produce this data frame: 1 a 1 b 1 c 2 d 2 e 3 f Is it possible without looping? Thank you!
Dimitri Liakhovitski
Hi I am not sure if this is more efficient than some loop I just gave your data another column names.
names(x)<-c("one", "two")
x
one two 1 1 a, b, c 2 2 d, e 3 3 f
s<-(strsplit(x$two, ",")) s
[[1]] [1] "a" " b" " c" [[2]] [1] "d" " e" [[3]] [1] "f"
first<-rep(x$one ,unlist(lapply(s, length)))
data.frame(first, second=unlist(s))
first second 1 1 a 2 1 b 3 1 c 4 2 d 5 2 e 6 3 f Maybe you want to remove extra white space form your values. It is mentioned somewhere in help pages to regular expressions Cheers Petr
-----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dimitri Liakhovitski Sent: Thursday, April 23, 2015 3:15 PM To: r-help Subject: [R] reshape data frame when one column has unequal number of entries Hello! I have my data frame x with 2 character columns: x <- data.frame(a = numeric(), b = I(list())) x[1:3,"a"] = 1:3 x[[1, "b"]] <- "a, b, c" x[[2, "b"]] <- "d, e" x[[3, "b"]] <- "f" x$a = as.character(x$a) x$b = as.character(x$b) x str(x) I need to produce this data frame: 1 a 1 b 1 c 2 d 2 e 3 f Is it possible without looping? Thank you! -- Dimitri Liakhovitski
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
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Hi Dimitri here is a quick crude way (needs some polishing) data.frame(a = rep(x$a,sapply(sapply(x$b, strsplit, ", "), length)), b= unlist(sapply(x$b, strsplit, ", "))) Duncan Duncan Mackay Department of Agronomy and Soil Science University of New England Armidale NSW 2351 Email: home: mackay at northnet.com.au -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dimitri Liakhovitski Sent: Thursday, 23 April 2015 23:15 To: r-help Subject: [R] reshape data frame when one column has unequal number of entries Hello! I have my data frame x with 2 character columns: x <- data.frame(a = numeric(), b = I(list())) x[1:3,"a"] = 1:3 x[[1, "b"]] <- "a, b, c" x[[2, "b"]] <- "d, e" x[[3, "b"]] <- "f" x$a = as.character(x$a) x$b = as.character(x$b) x str(x) I need to produce this data frame: 1 a 1 b 1 c 2 d 2 e 3 f Is it possible without looping? Thank you!
Dimitri Liakhovitski ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Thank you very much, everybody!
Hi Dimitri here is a quick crude way (needs some polishing) data.frame(a = rep(x$a,sapply(sapply(x$b, strsplit, ", "), length)), b= unlist(sapply(x$b, strsplit, ", "))) Duncan Duncan Mackay Department of Agronomy and Soil Science University of New England Armidale NSW 2351 Email: home: mackay at northnet.com.au -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dimitri Liakhovitski Sent: Thursday, 23 April 2015 23:15 To: r-help Subject: [R] reshape data frame when one column has unequal number of entries Hello! I have my data frame x with 2 character columns: x <- data.frame(a = numeric(), b = I(list())) x[1:3,"a"] = 1:3 x[[1, "b"]] <- "a, b, c" x[[2, "b"]] <- "d, e" x[[3, "b"]] <- "f" x$a = as.character(x$a) x$b = as.character(x$b) x str(x) I need to produce this data frame: 1 a 1 b 1 c 2 d 2 e 3 f Is it possible without looping? Thank you! -- Dimitri Liakhovitski
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
Dimitri Liakhovitski