Dear friends - I have a very simple question -
I generate a number of dataframes with identical names and want to
combine them into one large dataframe with the same names -
here is an example
DF <- data.frame(a=rnorm(10),b=runif(10),ID=0)
for (i in 1:10){
DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))}
- the dataframe do not grow as I thought it would.
How would I do this?
All best wishes
Troels Ring
Nephrology
Aalborg
Denmark
Hi Maybe little bit of studying how functions work can be useful rbind uses to bind two objects together, however you give it only one. Use DF <- rbind(DF, data.frame(a=rnorm(10),b=runif(10),ID=i)) instead. Cheers Petr> -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Troels > Ring > Sent: Friday, December 04, 2015 5:03 PM > To: r-help at r-project.org > Subject: [R] dataframe rbind > > Dear friends - I have a very simple question - I generate a number of > dataframes with identical names and want to combine them into one large > dataframe with the same names - here is an example > > DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) > for (i in 1:10){ > DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))} > > - the dataframe do not grow as I thought it would. > > How would I do this? > > All best wishes > Troels Ring > Nephrology > Aalborg > Denmark > > ______________________________________________ > 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.
This will work, although depending on what you are trying to do, there may be a better way:> DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) > for (i in 1:10){+ DF <- rbind(DF, data.frame(a=rnorm(10),b=runif(10),ID=i))}> str(DF)'data.frame': 110 obs. of 3 variables: $ a : num 0.792 0.141 -1.091 -0.918 1.265 ... $ b : num 0.5935 0.695 0.075 0.0827 0.852 ... $ ID: num 0 0 0 0 0 0 0 0 0 0 ... For example:> DF <- data.frame(a=rnorm(110), b=rnorm(110), ID=rep(0:10, each=10)) > str(DF)'data.frame': 110 obs. of 3 variables: $ a : num -1.91926 0.00791 0.65523 0.95019 1.23822 ... $ b : num 0.344 1.281 2.057 -1.69 -0.268 ... $ ID: int 0 0 0 0 0 0 0 0 0 0 ... ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Troels Ring Sent: Friday, December 4, 2015 10:03 AM To: r-help at r-project.org Subject: [R] dataframe rbind Dear friends - I have a very simple question - I generate a number of dataframes with identical names and want to combine them into one large dataframe with the same names - here is an example DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) for (i in 1:10){ DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))} - the dataframe do not grow as I thought it would. How would I do this? All best wishes Troels Ring Nephrology Aalborg Denmark ______________________________________________ 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.
Try reading and following the Help file, ?rbind.data.frame. You are inventing your own syntax, not using R's. Incidentally, growing the frames as you do is generally a bad idea. Search r-help archives for why. Cheers, Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Fri, Dec 4, 2015 at 8:03 AM, Troels Ring <tring at gvdnet.dk> wrote:> Dear friends - I have a very simple question - > I generate a number of dataframes with identical names and want to combine > them into one large dataframe with the same names - > here is an example > > DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) > for (i in 1:10){ > DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))} > > - the dataframe do not grow as I thought it would. > > How would I do this? > > All best wishes > Troels Ring > Nephrology > Aalborg > Denmark > > ______________________________________________ > 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.
On 04 Dec 2015, at 17:03 , Troels Ring <tring at gvdnet.dk> wrote:> Dear friends - I have a very simple question - > I generate a number of dataframes with identical names and want to combine them into one large dataframe with the same names - > here is an example > > DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) > for (i in 1:10){ > DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))} > > - the dataframe do not grow as I thought it would. >Don't you mean DF <- rbind(DF, data.frame(...... ? (Or, but a different discussion, do.call("rbind", lapply(1:10, function(i) data.frame(.....,ID=i))) -pd> How would I do this? > > All best wishes > Troels Ring > Nephrology > Aalborg > Denmark > > ______________________________________________ > 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.-- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
Thanks a lot - I should have seen that Best wishes Troels Den 04-12-2015 kl. 17:09 skrev PIKAL Petr:> Hi > > Maybe little bit of studying how functions work can be useful > > rbind uses to bind two objects together, however you give it only one. > > Use > > DF <- rbind(DF, data.frame(a=rnorm(10),b=runif(10),ID=i)) > > instead. > > Cheers > Petr > > >> -----Original Message----- >> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Troels >> Ring >> Sent: Friday, December 04, 2015 5:03 PM >> To: r-help at r-project.org >> Subject: [R] dataframe rbind >> >> Dear friends - I have a very simple question - I generate a number of >> dataframes with identical names and want to combine them into one large >> dataframe with the same names - here is an example >> >> DF <- data.frame(a=rnorm(10),b=runif(10),ID=0) >> for (i in 1:10){ >> DF <- DF+rbind(data.frame(a=rnorm(10),b=runif(10),ID=i))} >> >> - the dataframe do not grow as I thought it would. >> >> How would I do this? >> >> All best wishes >> Troels Ring >> Nephrology >> Aalborg >> Denmark >> >> ______________________________________________ >> 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. > ______________________________________________ > 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.