[EMAIL PROTECTED] writes: > On April 15th, Elizabeth wrote: > <snip> > > In execises 39-42, determine if the columns of the matrix span > > R4: > <snip> > >(or x <- matrix(data=c(7, -5, 6, -7, 2, -3, 10, 9, -5, > > 4, -2, 2, 8, -9, 7, 15), nrow=4, ncol=4) > > > >That is the whole of the question <snip> > > Have you tried det(x) and/or eigen(x) ?
An alternative is to determine the condition number (kappa) of the matrix > x <- matrix(data=c(7, -5, 6, -7, 2, -3, 10, 9, -5, + 4, -2, 2, 8, -9, 7, 15), nrow=4, ncol=4) > kappa(x) [1] 5.31557e+17 A very large condition number like this indicates that the matrix is computationally singular. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
