I have a string that contains a number and when I convert it to a number I loose precision and I would like to know if there is a way to avoid that. Here is my example: p <- "1087.003489" as.numeric(p, digits=6) R gives me 1087.003:> p <- "1087.003489" > as.numeric(p, digits=6)[1] 1087.003 I would be nice if I could keep all the decimal places after the conversion. Thanks, Roger *************************************************************** This message and any attachments are for the intended recipient's use only. This message may contain confidential, proprietary or legally privileged information. No right to confidential or privileged treatment of this message is waived or lost by an error in transmission. If you have received this message in error, please immediately notify the sender by e-mail, delete the message, any attachments and all copies from your system and destroy any hard copies. You must not, directly or indirectly, use, disclose, distribute, print or copy any part of this message or any attachments if you are not the intended recipient.
Hello, There's a difference between the displayed value and the internally stored. You could use options(digits=10), but this is a global option, and will affect all future numerical output. default value is 7> p <- "1087.003489" > as.numeric(p, digits=6)[1] 1087.003> options(digits=10) # set output precision > as.numeric(p, digits=6)[1] 1087.003489>for more information look here: http://stackoverflow.com/questions/4540649/retain-numerical-precision-in-an-r-data-frame regards calin On Thu, Jul 2, 2015 at 3:56 PM Bos, Roger <roger.bos at rothschild.com> wrote:> I have a string that contains a number and when I convert it to a number I > loose precision and I would like to know if there is a way to avoid that. > Here is my example: > > p <- "1087.003489" > as.numeric(p, digits=6) > > R gives me 1087.003: > > > p <- "1087.003489" > > as.numeric(p, digits=6) > [1] 1087.003 > > I would be nice if I could keep all the decimal places after the > conversion. > > Thanks, > > Roger > > > > > > *************************************************************** > This message and any attachments are for the intended recipient's use only. > This message may contain confidential, proprietary or legally privileged > information. No right to confidential or privileged treatment > of this message is waived or lost by an error in transmission. > If you have received this message in error, please immediately > notify the sender by e-mail, delete the message, any attachments and all > copies from your system and destroy any hard copies. You must > not, directly or indirectly, use, disclose, distribute, > print or copy any part of this message or any attachments if you are not > the intended 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. >[[alternative HTML version deleted]]
Hi Roger, I think it does! Try multiplying with 1000000 or similar. It is just a matter of displaying your result. best d ________________________________________ Felad?: R-help [r-help-bounces at r-project.org] ; meghatalmazó: Bos, Roger [roger.bos at rothschild.com] K?ldve: 2015. j?lius 2. 15:54 To: r-help at r-project.org T?rgy: [R] as.numeric looses precision I have a string that contains a number and when I convert it to a number I loose precision and I would like to know if there is a way to avoid that. Here is my example: p <- "1087.003489" as.numeric(p, digits=6) R gives me 1087.003:> p <- "1087.003489" > as.numeric(p, digits=6)[1] 1087.003 I would be nice if I could keep all the decimal places after the conversion. Thanks, Roger *************************************************************** This message and any attachments are for the intended recipient's use only. This message may contain confidential, proprietary or legally privileged information. No right to confidential or privileged treatment of this message is waived or lost by an error in transmission. If you have received this message in error, please immediately notify the sender by e-mail, delete the message, any attachments and all copies from your system and destroy any hard copies. You must not, directly or indirectly, use, disclose, distribute, print or copy any part of this message or any attachments if you are not the intended 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.
Hi As already mentioned it is a matter of printing result on your console.> p <- "1087.003489" > as.numeric(p, digits=6)[1] 1087.003> options(digits=20) > as.numeric(p)[1] 1087.0034889999999 The other problem is that when using PC you run into FAQ 7.31 decimal issue. "1087.003489" number can not be represented precisely in binary arithmetic. Cheers Petr> -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Bos, > Roger > Sent: Thursday, July 02, 2015 3:55 PM > To: r-help at r-project.org > Subject: [R] as.numeric looses precision > > I have a string that contains a number and when I convert it to a > number I loose precision and I would like to know if there is a way to > avoid that. Here is my example: > > p <- "1087.003489" > as.numeric(p, digits=6) > > R gives me 1087.003: > > > p <- "1087.003489" > > as.numeric(p, digits=6) > [1] 1087.003 > > I would be nice if I could keep all the decimal places after the > conversion. > > Thanks, > > Roger > > > > > > *************************************************************** > This message and any attachments are for the intended recipient's use > only. > This message may contain confidential, proprietary or legally > privileged information. No right to confidential or privileged > treatment of this message is waived or lost by an error in > transmission. > If you have received this message in error, please immediately notify > the sender by e-mail, delete the message, any attachments and all > copies from your system and destroy any hard copies. You must not, > directly or indirectly, use, disclose, distribute, print or copy any > part of this message or any attachments if you are not the intended > 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.________________________________ 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.
Hi Roger, You're mixing up storage and display: p <- "1087.003489" p <- as.numeric(p)> p[1] 1087.003 # the default value for digits = 7, which can be changed with option()> print(p, digits=4)[1] 1087> print(p, digits=10)[1] 1087.003489 But note also:> print(p, digits=20)[1] 1087.003488999999945 (And see FAQ 7.31 if you don't understand why.) Sarah On Thu, Jul 2, 2015 at 9:54 AM, Bos, Roger <roger.bos at rothschild.com> wrote:> I have a string that contains a number and when I convert it to a number I loose precision and I would like to know if there is a way to avoid that. Here is my example: > > p <- "1087.003489" > as.numeric(p, digits=6) > > R gives me 1087.003: > >> p <- "1087.003489" >> as.numeric(p, digits=6) > [1] 1087.003 > > I would be nice if I could keep all the decimal places after the conversion. > > Thanks, > > Roger >-- Sarah Goslee http://www.functionaldiversity.org