Hi Christy, Try either of the following
subset(x, select = vars) x[, vars] HTH, Jorge.- On Tue, May 15, 2012 at 1:12 AM, christy < <saunders.chri...@ymail.com>>wrote: > hi, please help me on this. I'm very new to R. I've been figuring out how > to > do this the whole day, and I could not get the correct R code. > > Suppose I have a dataframe called x and it consists of 10variables. > > >x > > h 1 h 2 h 3 h 4 h 5 h 6 > h 7 h 8 h 9 > 1 0.38971928 0.62884802 0.32708216 0.093909834 0.57773251 0.41258918 > 0.37360577 0.65259411 0.88204799 > 2 0.51890830 0.15949863 0.75715149 0.871781822 0.06321826 0.91844114 > 0.05692871 0.84588084 0.77173376 > 3 0.94057256 0.16100731 0.80961141 0.239716639 0.55804412 0.42854829 > 0.54987115 0.68416629 0.24353692 > 4 0.19895720 0.52955693 0.98471869 0.378197899 0.16774788 0.68029534 > 0.42039730 0.82217244 0.74397124 > 5 0.27899679 0.29145024 0.07198476 0.732466508 0.14887818 0.90658800 > 0.64186885 0.66542828 0.98182923 > 6 0.69375077 0.05840897 0.77325437 0.866099979 0.75063858 0.94230759 > 0.72182389 0.65574673 0.27406027 > 7 0.35033643 0.22525597 0.81657974 0.000762193 0.88383211 0.98120966 > 0.29471244 0.32119662 0.10313222 > 8 0.40616362 0.37962815 0.80085463 0.919385580 0.47183711 0.15078169 > 0.93693666 0.24638847 0.12288727 > 9 0.07939773 0.39030956 0.50235863 0.516507293 0.49247563 0.30633870 > 0.45665595 0.25479969 0.34689089 > 10 0.68677267 0.32089352 0.61330153 0.444584299 0.15588483 0.30584289 > 0.78482250 0.55628942 0.81763581 > 11 0.47406350 0.75586693 0.19546691 0.698137899 0.47609057 0.56439955 > 0.33120842 0.54064656 0.36384570 > 12 0.73796417 0.32741375 0.60800036 0.249716033 0.21919825 0.14749886 > 0.53495852 0.74101013 0.69063797 > 13 0.87890769 0.77631054 0.76307442 0.561350947 0.73865259 0.58031305 > 0.06972116 0.53286669 0.09135791 > 14 0.91022993 0.52290742 0.21219953 0.209784849 0.90892801 0.03580675 > 0.19870342 0.79300520 0.85703181 > 15 0.11331488 0.67744821 0.96226396 0.350925439 0.32038355 0.39465379 > 0.38653925 0.09538576 0.04436648 > 16 0.71950535 0.77548893 0.60316799 0.123102348 0.10200008 0.05392754 > 0.17026972 0.17092818 0.35550621 > 17 0.29593089 0.75526797 0.52088596 0.629731365 0.13592383 0.20219434 > 0.63906356 0.55297375 0.30580842 > 18 0.02915505 0.56244353 0.62397566 0.770202648 0.07929744 0.08574671 > 0.36506494 0.47563923 0.84796898 > 19 0.27369892 0.95739919 0.63443013 0.810165262 0.10230919 0.52165672 > 0.84467928 0.60684813 0.02245486 > 20 0.31494866 0.26169713 0.84314426 0.239598362 0.59996122 0.46954979 > 0.99728261 0.28905422 0.91817317 > h 10 > 1 0.552413907 > 2 0.130387427 > 3 0.523121318 > 4 0.610000351 > 5 0.005378552 > 6 0.275925081 > 7 0.939273614 > 8 0.152024143 > 9 0.216325412 > 10 0.577869906 > 11 0.484999656 > 12 0.686217251 > 13 0.920351777 > 14 0.924500707 > 15 0.577019180 > 16 0.824386203 > 17 0.130089829 > 18 0.539668426 > 19 0.776488706 > 20 0.992742685 > > > and i have a vector of strings which I called vars. > > > vars > [1] "h 8" "h 4" "h 10" "h 1" > > > the variables inside vars are subset of the column names of x. The order > is > important. In my dataframe, I want to obtain the following: > > >newdata > h 8 h 4 h 10 h 1 > [1,] 0.65259411 0.093909834 0.552413907 0.38971928 > [2,] 0.84588084 0.871781822 0.130387427 0.51890830 > [3,] 0.68416629 0.239716639 0.523121318 0.94057256 > [4,] 0.82217244 0.378197899 0.610000351 0.19895720 > [5,] 0.66542828 0.732466508 0.005378552 0.27899679 > [6,] 0.65574673 0.866099979 0.275925081 0.69375077 > [7,] 0.32119662 0.000762193 0.939273614 0.35033643 > [8,] 0.24638847 0.919385580 0.152024143 0.40616362 > [9,] 0.25479969 0.516507293 0.216325412 0.07939773 > [10,] 0.55628942 0.444584299 0.577869906 0.68677267 > [11,] 0.54064656 0.698137899 0.484999656 0.47406350 > [12,] 0.74101013 0.249716033 0.686217251 0.73796417 > [13,] 0.53286669 0.561350947 0.920351777 0.87890769 > [14,] 0.79300520 0.209784849 0.924500707 0.91022993 > [15,] 0.09538576 0.350925439 0.577019180 0.11331488 > [16,] 0.17092818 0.123102348 0.824386203 0.71950535 > [17,] 0.55297375 0.629731365 0.130089829 0.29593089 > [18,] 0.47563923 0.770202648 0.539668426 0.02915505 > [19,] 0.60684813 0.810165262 0.776488706 0.27369892 > [20,] 0.28905422 0.239598362 0.992742685 0.31494866 > > I tried to do the following but it does not give me what I want: > > x[names(x)==names(x[names(x)%in%vars])] > > > Thank you very much. > > ~Christy > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/how-to-create-a-new-data-given-a-vector-of-variable-names-tp4630024.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.
