Try this: data.frame(ID = apply(expand.grid(x$ID, x$ID), 1, paste, collapse = '-'), diff = c(outer(x$val, x$val, '-')))
On Mon, Sep 21, 2009 at 9:39 AM, alessandro carletti <alxmil...@yahoo.it> wrote: > Hi, > I have a problem. > I have a data frame looking like: > > ID val > > A .3 > B 1.2 > C 3.4 > D 2.2 > E 2.0 > > I need to CREATE the following TABLE: > > CASE DIFF > > A-A 0 > A-B -0.9 > A-C -3.1 > A-D -1.9 > A-E -1.7 > B-A ... > B-B ... > B-C > B-D > B-E > C-A > C-B > C-C > C-D > C-E > D-A > D-B > D-C > D-D > D-E > E-A > E-B > E-C > E-D > E-E > > WHERE CASE IS THE COUPLE OF ELEMENTS CONSIDEREDM AND DIFF IS THE computed > DIFFERENCE between their values. > > Could you give me suggestions? > > Alessandro Carletti > > > > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
