On Sat, May 10, 2008 at 5:27 AM, amarkos <[EMAIL PROTECTED]> wrote: > An indicator matrix is a binary matrix with orthogonal columns whose > rows sum to 1. A row of this matrix could be [0 1 0 0]. My problem is > to group the similar rows (profiles) so that to create a compact form > of the matrix.
I'm not sure exactly what you mean by a compact form of this matrix. Do you mean that you want to collapse similar rows into a single row and perhaps a count of the number of times that this row occurs? In R indicator matrices are typically generated from a factor and essentially you are asking for the tabulation of the factor, such as provided by the functions table and xtabs. > Is there an R function that deals with this problem or do I have to > write it from scratch? > > Thanks, > Angelos Markos > Dr. Applied Informatics, > University of Macedonia, Greece > > ______________________________________________ > 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.
