Now we are able to help you. What you see is an artefact of an object in T of class 'factor'
> ## So please, see ?factor > ## first 2 columns subset of a factor > str(a) 'data.frame': 1 obs. of 4 variables: $ GHP: Factor w/ 51 levels "0.0944","0.1446",..: 33 $ GP : Factor w/ 51 levels "0.1755","0.3582",..: 29 $ T : num 2.9 $ Tn : num 3.3 > > ## you can't do this for a dataframe with columns of factors > ## it doesn't give you the labels of the levels as one would expect > ## but for some reason the number of levels > as.character(a) [1] "33" "29" "2.9007" "3.2988" > > ## gets the number of level (33) > as.numeric(a[,1]) [1] 33 > ## gets the label of level number 33 > as.character(a[,1]) [1] "2.2194" > ## gets the label as a numeric > as.numeric(as.character(a[,1])) [1] 2.2194 > > ## do this for the first 2 columns > for (i in 1:2) a[,i] <- as.numeric(as.character(a[,i])) > > ## the structure of a > str(a) 'data.frame': 1 obs. of 4 variables: $ GHP: num 2.22 $ GP : num 2.66 $ T : num 2.9 $ Tn : num 3.3 > > ## now > min(a) [1] 2.2194 > Yours sincerely / Med venlig hilsen Frede Aakmann Tøgersen Specialist, M.Sc., Ph.D. Plant Performance & Modeling Technology & Service Solutions T +45 9730 5135 M +45 2547 6050 fr...@vestas.com http://www.vestas.com Company reg. name: Vestas Wind Systems A/S This e-mail is subject to our e-mail disclaimer statement. Please refer to www.vestas.com/legal/notice If you have received this e-mail in error please contact the sender. > -----Original Message----- > From: Sachinthaka Abeywardana [mailto:sachin.abeyward...@gmail.com] > Sent: 9. april 2014 08:26 > To: Frede Aakmann Tøgersen; r-help@r-project.org > Subject: Re: [R] Not able to convert data.frame to numeric properly > > a is ofcourse a subset of data.frame, a ROW of the original table > specifically. > > > str(a) > 'data.frame': 1 obs. of 4 variables: > $ GHP: Factor w/ 51 levels "0.0944","0.1446",..: 33 > $ GP : Factor w/ 51 levels "0.1755","0.3582",..: 29 > $ T : num 2.9 > $ Tn : num 3.3 > > dput(a) > structure(list(GHP = structure(33L, .Label = c("0.0944", "0.1446", > "0.2", "0.4124", "0.7601", "0.871", "0.8849", "0.9176", "1.0168", > "1.0663", "1.0947", "1.1823", "1.1831", "1.2418", "1.2542", "1.3082", > "1.3283", "1.3758", "1.4437", "1.4621", "1.5769", "1.6699", "1.7306", > "1.8366", "1.8456", "1.8651", "1.8972", "1.9595", "2.0781", "2.0802", > "2.1553", "2.2097", "2.2194", "2.3669", "2.3935", "2.5351", "2.5374", > "2.5966", "2.6934", "2.7764", "2.9073", "6.003", "6.0825", "6.1013", > "6.1068", "6.1675", "6.2401", "6.6001", "6.6047", "7.8665", "+AC0-27.0565" > ), class = "factor"), GP = structure(29L, .Label = c("0.1755", > "0.3582", "0.4155", "0.4208", "0.7388", "0.8394", "0.8853", "0.9254", > "0.9423", "0.9695", "0.9757", "0.9793", "0.9896", "1.0422", "1.0519", > "1.116", "1.2482", "1.2691", "1.2735", "1.2788", "1.2948", "1.3141", > "1.3204", "1.4006", "1.5333", "1.6157", "1.9003", "2.6024", "2.6561", > "2.7466", "2.7572", "2.8108", "2.8256", "2.9565", "2.978", "3.0665", > "3.1155", "3.2027", "3.2123", "3.257", "3.4055", "6.0616", "6.0671", > "6.1166", "6.2053", "6.592", "6.6734", "7.005", "7.3159", "8.5777", > "+AC0-20.3347"), class = "factor"), T = 2.9007, Tn = 3.2988), .Names = > c("GHP", > "GP", "T", "Tn"), row.names = 28L, class = "data.frame") > > On Wed, Apr 9, 2014 at 4:17 PM, Frede Aakmann Tøgersen > <fr...@vestas.com> wrote: > > We can't say because we don't know how a was created. > > > > Please email the output from > > > > str(a) > > > > and > > > > dput(a) > > > > > > > > Yours sincerely / Med venlig hilsen > > > > > > Frede Aakmann Tøgersen > > Specialist, M.Sc., Ph.D. > > Plant Performance & Modeling > > > > Technology & Service Solutions > > T +45 9730 5135 > > M +45 2547 6050 > > fr...@vestas.com > > http://www.vestas.com > > > > Company reg. name: Vestas Wind Systems A/S > > This e-mail is subject to our e-mail disclaimer statement. > > Please refer to www.vestas.com/legal/notice > > If you have received this e-mail in error please contact the sender. > > > > > >> -----Original Message----- > >> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] > >> On Behalf Of Sachinthaka Abeywardana > >> Sent: 9. april 2014 08:11 > >> To: r-help@r-project.org > >> Subject: [R] Not able to convert data.frame to numeric properly > >> > >> I have the following: > >> > >> > >> >a #note that the 28 is a row.name > >> > >> GHP GP T Tn > >> 28 2.2194 2.6561 2.9007 3.2988 > >> > >> >min(as.numeric(a)) > >> 2.9007 > >> >min(as.numeric(as.character(a))) > >> 2.9007 > >> >as.numeric(as.character(a)) #What's going on here??? > >> [1] 33.0000 29.0000 2.9007 3.2988 > >> > >> So basically how do I get this to show the correct value of 2.21 as my > >> minimum value? > >> > >> Thanks, > >> Sachin > >> > >> ______________________________________________ > >> R-help@r-project.org mailing list > >> 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. ______________________________________________ R-help@r-project.org mailing list 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.