>>>>> "JohnF" == John Fox <[EMAIL PROTECTED]> >>>>> on Tue, 24 Jun 2008 08:10:43 -0400 writes:
JohnF> Dear Maria, On 23-Jun-08, at 11:40 PM, Maria JohnF> Gavilanez wrote: >> Hi. >> >> is there a way to transform a table that has numeric and >> categorical variables into a matrix? JohnF> No, because all of the elements of a matrix must be JohnF> of the same mode, but a dataframe is a data structure JohnF> that can have heterogeneous columns. It's unclear JohnF> from your question where the "table" is located -- in JohnF> a file perhaps? If so, you can use read.table() to JohnF> read the data into a dataframe. Yes, and then possibly use data.matrix(.) to produce a numeric matrix where the "categorical variables" have become numeric (via their internal codes). Martin Maechler, ETH Zurich JohnF> I hope this helps, John JohnF> -------------------------------------------- John JohnF> Fox, Professor Department of Sociology McMaster JohnF> University Hamilton ON Canada L8S 4M4 web: JohnF> socserv.mcmaster.ca/jfox >> >> >> thanks >> >> >> Maria Mercedes Gavilanez Department of Biological >> Sciences 107 Life Sciences Building Louisiana State >> University Baton Rouge, LA 70803 (225)578-4284 >> >> ______________________________________________ >> 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. JohnF> ______________________________________________ JohnF> R-help@r-project.org mailing list JohnF> https://stat.ethz.ch/mailman/listinfo/r-help PLEASE JohnF> do read the posting guide JohnF> http://www.R-project.org/posting-guide.html and JohnF> provide commented, minimal, self-contained, JohnF> 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.