[R] Data frame referencing?
Dear R users, When you do: x - rnorm(10) y - rnorm(10) z - rnorm(10) a - data.frame(x,y,z) a$x [1] 1.37821893 0.21152756 -0.55453182 -2.10426048 -0.08967880 0.03712110 [7] -0.80592149 0.07413450 0.15557671 1.22165341 Why does this not work: a[a$y0.5,y] -1 Error in [-.data.frame(`*tmp*`, a$y 0.5, y, value = 1) : only 0's may be mixed with negative subscripts While this works: a[a$y0.5,2] -1 a x y z 1 1.37821893 -1.0887363 1.7340522 2 0.21152756 -0.7256467 -1.3165373 3 -0.55453182 1.000 -2.1116072 4 -2.10426048 -0.4898596 -1.5863823 5 -0.08967880 1.000 -0.9139706 6 0.03712110 1.000 -1.3004970 7 -0.80592149 -0.7004193 -0.1958059 8 0.07413450 1.000 -1.3574303 9 0.15557671 -0.3335407 -2.1991236 10 1.22165341 1.000 -0.7576708 For a complex loop I would prefer to reference the right colomn by name, not by number! Now, when the colomns change, I need to check my code to make sure that the right colomns are referenced. Suggestions much appreciated! Thanks in advance, Sander. __ R-help@stat.math.ethz.ch 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.
Re: [R] Data frame referencing?
When specifying a column name with [ the name must be quoted (unlike when using it with $): a[a$y 0.5, y] - 1 On 8/4/06, Sander Oom [EMAIL PROTECTED] wrote: Dear R users, When you do: x - rnorm(10) y - rnorm(10) z - rnorm(10) a - data.frame(x,y,z) a$x [1] 1.37821893 0.21152756 -0.55453182 -2.10426048 -0.08967880 0.03712110 [7] -0.80592149 0.07413450 0.15557671 1.22165341 Why does this not work: a[a$y0.5,y] -1 Error in [-.data.frame(`*tmp*`, a$y 0.5, y, value = 1) : only 0's may be mixed with negative subscripts While this works: a[a$y0.5,2] -1 a x y z 1 1.37821893 -1.0887363 1.7340522 2 0.21152756 -0.7256467 -1.3165373 3 -0.55453182 1.000 -2.1116072 4 -2.10426048 -0.4898596 -1.5863823 5 -0.08967880 1.000 -0.9139706 6 0.03712110 1.000 -1.3004970 7 -0.80592149 -0.7004193 -0.1958059 8 0.07413450 1.000 -1.3574303 9 0.15557671 -0.3335407 -2.1991236 10 1.22165341 1.000 -0.7576708 For a complex loop I would prefer to reference the right colomn by name, not by number! Now, when the colomns change, I need to check my code to make sure that the right colomns are referenced. Suggestions much appreciated! Thanks in advance, Sander. __ R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.
Re: [R] Data frame referencing?
you need to use quotes, i.e., a[a$y 0.5, y] - 1 you can also use a$y[a$y 0.5] - 1 I hope it helps. Best, Dimitris Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm - Original Message - From: Sander Oom [EMAIL PROTECTED] To: r-help@stat.math.ethz.ch Sent: Friday, August 04, 2006 1:48 PM Subject: [R] Data frame referencing? Dear R users, When you do: x - rnorm(10) y - rnorm(10) z - rnorm(10) a - data.frame(x,y,z) a$x [1] 1.37821893 0.21152756 -0.55453182 -2.10426048 -0.08967880 0.03712110 [7] -0.80592149 0.07413450 0.15557671 1.22165341 Why does this not work: a[a$y0.5,y] -1 Error in [-.data.frame(`*tmp*`, a$y 0.5, y, value = 1) : only 0's may be mixed with negative subscripts While this works: a[a$y0.5,2] -1 a x y z 1 1.37821893 -1.0887363 1.7340522 2 0.21152756 -0.7256467 -1.3165373 3 -0.55453182 1.000 -2.1116072 4 -2.10426048 -0.4898596 -1.5863823 5 -0.08967880 1.000 -0.9139706 6 0.03712110 1.000 -1.3004970 7 -0.80592149 -0.7004193 -0.1958059 8 0.07413450 1.000 -1.3574303 9 0.15557671 -0.3335407 -2.1991236 10 1.22165341 1.000 -0.7576708 For a complex loop I would prefer to reference the right colomn by name, not by number! Now, when the colomns change, I need to check my code to make sure that the right colomns are referenced. Suggestions much appreciated! Thanks in advance, Sander. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Data frame referencing?
Dear Gabor and Dimitris, Simple, once you know! It is these little exceptions on the R notation that get me stuck. Now I am on the loose again! Thanks, Sander. Dimitris Rizopoulos wrote: you need to use quotes, i.e., a[a$y 0.5, y] - 1 you can also use a$y[a$y 0.5] - 1 I hope it helps. Best, Dimitris Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm - Original Message - From: Sander Oom [EMAIL PROTECTED] To: r-help@stat.math.ethz.ch Sent: Friday, August 04, 2006 1:48 PM Subject: [R] Data frame referencing? Dear R users, When you do: x - rnorm(10) y - rnorm(10) z - rnorm(10) a - data.frame(x,y,z) a$x [1] 1.37821893 0.21152756 -0.55453182 -2.10426048 -0.08967880 0.03712110 [7] -0.80592149 0.07413450 0.15557671 1.22165341 Why does this not work: a[a$y0.5,y] -1 Error in [-.data.frame(`*tmp*`, a$y 0.5, y, value = 1) : only 0's may be mixed with negative subscripts While this works: a[a$y0.5,2] -1 a x y z 1 1.37821893 -1.0887363 1.7340522 2 0.21152756 -0.7256467 -1.3165373 3 -0.55453182 1.000 -2.1116072 4 -2.10426048 -0.4898596 -1.5863823 5 -0.08967880 1.000 -0.9139706 6 0.03712110 1.000 -1.3004970 7 -0.80592149 -0.7004193 -0.1958059 8 0.07413450 1.000 -1.3574303 9 0.15557671 -0.3335407 -2.1991236 10 1.22165341 1.000 -0.7576708 For a complex loop I would prefer to reference the right colomn by name, not by number! Now, when the colomns change, I need to check my code to make sure that the right colomns are referenced. Suggestions much appreciated! Thanks in advance, Sander. __ R-help@stat.math.ethz.ch 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. Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm __ R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.
