Dimitri Liakhovitski
2015-Apr-23 13:15 UTC
[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
PIKAL Petr
2015-Apr-23 14:35 UTC
[R] reshape data frame when one column has unequal number of entries
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") > xone 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.________________________________ Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu. V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou. - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. In case that this e-mail forms part of business dealings: - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.
Duncan Mackay
2015-Apr-23 14:38 UTC
[R] reshape data frame when one column has unequal number of entries
Hi Dimitri here is a quick crude way (needs some polishing) data.frame(a = rep(x$a,sapply(sapply(x$b, strsplit, ", "), length)), bunlist(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$b) x str(x) I need to produce this data frame: 1 a 1 b 1 c 2 d 2 e 3 f Is it possible without looping? Thank you! -- Dimitri Liakhovitski ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Dimitri Liakhovitski
2015-Apr-23 22:25 UTC
[R] reshape data frame when one column has unequal number of entries
Thank you very much, everybody! On Thu, Apr 23, 2015 at 10:38 AM, Duncan Mackay <dulcalma at bigpond.com> wrote:> Hi Dimitri > > here is a quick crude way (needs some polishing) > > data.frame(a = rep(x$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