Yes, what I would do is write a function around the all.equal() comparisons on the data to see which values are "nearly" identical to the ones desired I the subset. If TRUE, I would retain those values and discard the others.
-----Original Message----- From: Simon Hayward [mailto:simon.hayw...@infinitycloud.com] Sent: Thursday, November 07, 2013 11:59 AM To: Doran, Harold; 'Eckstädt, Elisabeth'; r-help@R-project.org Subject: RE: strange behaviour when subsetting a data.frame So is there a way to make the subsetting behave as expected? -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Doran, Harold Sent: 07 November 2013 16:52 To: 'Eckstädt, Elisabeth'; r-help@R-project.org Subject: Re: [R] strange behaviour when subsetting a data.frame Yes, but notice that man2[3,] == .3 [1] FALSE This is because of issues of machine precision when dealing with floating points, not a problem in R. Comparisons for nearly equivalent numbers are done using all.equal() as shown below. > all.equal(man2[3,], .3) [1] TRUE -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Eckstädt, Elisabeth Sent: Thursday, November 07, 2013 8:37 AM To: r-help@R-project.org Subject: [R] strange behaviour when subsetting a data.frame Hello everyone, I am experiencing a unfathomable benaviour of "subset" on a data.frame. This is a minimal reproducable example. The data.frame cosists only of one column, which contains 10 ascending values (from 0.1 to 1). Subsetting for 0.1 is working (gives me one row), subsetting for 0.3 gives me zero rows? Doing the same with values from 1 to 10 is working out well (as expected). Beimischung=seq(0.1,1,0.1) man2=data.frame(Beimischung) subset(man2, Beimischung==0.3) #---> gives 0 rows subset(man2, Beimischung==0.1) ---> gives one row (as expected)# #also not working: man2$Beimischung3=man2$Beimischung*10 subset(man2, Beimischung3==3) --> gives 0 rows Does anybody have a clue for me? Thanks in advance Regards Elisabeth _______________ Dipl.-Ing. Elisabeth Eckstädt Member of Academic Staff & PhD Student Technische Universität Dresden Faculty of Mechanical Engineering Institue of Power Engineering Chair of Building Energy Systems and Heat Supply Phone +49 351 463 34709 Fax +49 351 463 37076 Web http://tu-dresden.de/mw/iet/ew ______________________________________________ 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. ______________________________________________ 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.
