Re: [R] matrix which results singular but at the same time positive definite

Da: Paul Gilbert [pgilbert...@gmail.com] Inviato: martedì 15 dicembre 2015 15.28 A: Stefano Sofia Cc: r-help@r-project.org; Fox, John; peter dalgaard Oggetto: Re: [R] matrix which results singular but at the same time positive definite Stefano I think in other response to in this thread you got

Re: [R] matrix which results singular but at the same time positive definite

Stefano I think in other response to in this thread you got the answer to the question you asked, but you may be asking the wrong question. I'm not familiar with the specific papers you mention and you have not provided enough detail about what you are doing, so I am guessing a bit. The term

Re: [R] matrix which results singular but at the same time positive definite

-project.org Oggetto: RE: [R] matrix which results singular but at the same time positive definite Dear Peter, > -Original Message- > From: peter dalgaard [mailto:pda...@gmail.com] > Sent: Thursday, December 10, 2015 11:09 AM > To: Stefano Sofia > Cc: Fox, John; r-help@r-projec

Re: [R] matrix which results singular but at the same time positive definite

Dear Peter, > -Original Message- > From: peter dalgaard [mailto:pda...@gmail.com] > Sent: Thursday, December 10, 2015 11:09 AM > To: Stefano Sofia > Cc: Fox, John; r-help@r-project.org > Subject: Re: [R] matrix which results singular but at the same time > positiv

Re: [R] matrix which results singular but at the same time positive definite

-- > John Fox, Professor > McMaster University > Hamilton, Ontario > Canada L8S 4M4 > Web: socserv.mcmaster.ca/jfox > > > > >> -----Original Message- >> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Stefano Sofia >> Sent: December

Re: [R] matrix which results singular but at the same time positive definite

he data on these scales? > > Best, > John > > - > John Fox, Professor > McMaster University > Hamilton, Ontario > Canada L8S 4M4 > Web: socserv.mcmaster.ca/jfox > > > > > > -Original Message- > > From: R-help [mailto:r-hel

Re: [R] matrix which results singular but at the same time positive definite

Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Stefano Sofia > Sent: December 10, 2015 5:08 AM > To: r-help@r-project.org > Subject: [R] matrix which results singular but at the same time positive > definite > > Dear list users, > through th

Re: [R] matrix which results singular but at the same time positive definite

ofessor McMaster University Hamilton, Ontario Canada L8S 4M4 Web: socserv.mcmaster.ca/jfox > -Original Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Stefano Sofia > Sent: December 10, 2015 5:08 AM > To: r-help@r-project.org > Subject: [R] matrix wh

Re: [R] matrix which results singular but at the same time positive definite

On 10/12/15 23:08, Stefano Sofia wrote: Dear list users, through the "matrixcalc" package I am performing some checks of variance matrices (which must be positive definite). In this example, it happens that the matrix A here reported is singular but positive definite. Is it possible?

Re: [R] matrix which results singular but at the same time positive definite

Decrease the "tol" parameter specified into the "is.non.singular.matrix() call, for example as: m <- matrix(c( 1.904255e-12, -1.904255e-12, -8.238960e-13, -1.240294e-12, -1.904255e-12, 3.637979e-12, 1.364242e-12, 1.818989e-12, -8.238960e-13, 1.364242e-12, 4.80998

[R] matrix which results singular but at the same time positive definite

Dear list users, through the "matrixcalc" package I am performing some checks of variance matrices (which must be positive definite). In this example, it happens that the matrix A here reported is singular but positive definite. Is it possible? [,1] [,2] [,3]