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Please, please, we are talking about eigenvectors in the original post, not eigenvalues. They are indeed all real when they are symmetric (even for circulant matrices because the imaginary parts sum up to zero). Many thanks! --- "Huntsinger, Reid" <reid_huntsinger...

Dear list, Can someone please help me here? Is it not possible to use the R library for optimization and other routines calling from C? Thank you!! AarEm Trotter --- Globe Trotter <itsme_410 at yahoo.com> wrote: > Hi, > > I have...

Hi, I have read R's Writing Extensions manual and am still confused about how to use some of the routines there when I call from C. Specifically, I am writing a little test function which I will optimize using...

Sorry, forgot to switch the header to the R group.... --- Globe Trotter <itsme_410 at yahoo.com> wrote: > Date: Thu, 2 Mar 2006 19:35:21 -0800 (PST) > From: Globe Trotter <itsme_410 at yahoo.com> > Subject: Re: [R] calling...

> I'd do it now. Really. Not later. *Now*. Like the Posting Guide recommends. > > You may have heard of the sites www.r-project.org and cran.r-project.org. If > you look closely, you will discover a link 'Manuals...

Thanks for looking into this! Sure, I will try and provide more info, but sorry I seem to be doing really badly with posting.... > > Having cut&pasted from the data placed in the body of the > message (omitted here) I...

By the way, I just noticed that eigen(X) returns eigenvectors, at least two of which are NaN's. Best wishes! --- "Huntsinger, Reid" <reid_huntsinger at merck.com> wrote: > When the matrix is symmetric and omega is not real, omega...

Thanks! I will not give my e-mail address (hence the real name and affiliation), until the R-newsgroup moderators stop saving e-mail addresses to the archive, for spiders to pick up easily. Yes, I did not know how...

--- Rolf Turner <rolf at math.unb.ca> wrote: > I just Googled around a bit and found definitions of Toeplitz and > circulant matrices as follows: > > A Toeplitz matrix is any n x n matrix with values constant along each > (top-left...

--- "Huntsinger, Reid" <reid_huntsinger at merck.com> wrote: > Under Linux run "ldd" on the binary to see what shared libraries the binary > has been linked against and will attempt to load. The command you run is a > shell script which...

Dear Professor Ripley: Lets do this professionally, shall we? --- Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote: > On Sun, 1 May 2005, someone who didn't give his name wrote: > > > It is my understanding that the eigenvectors of...

OK, lets redo this again, and ensure that we start with a row that will indeed lead to a symmetric matrix for the circulant matrix: x<-scan("kinv") y<-x[c(109:1,2:108)] X=toeplitz(y) Z=y...

Hi, The R was downloaded in binary form (Fedora Core 3 RPM) from a CRAN mirror. I do not know which LAPACK it links to, but the only LAPACK on my machine is lapack-3.0-28 (RPM installation). How...

Looks like the files did not go through again. In any case, here is the kinv: please cut and paste and save to a file: -1.16801E-03 -2.24310E-03 -1.16864E-03 -2.24634E-03 -1.17143E-03...