Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

On Wed, Jun 29, 2011 at 4:04 PM, John Peterson wrote: > On Wed, Jun 29, 2011 at 1:56 PM, Omar Al-Abbasi wrote: >> Thanks for the suggestions. >> John are you suggesting that within my Libmesh code and prior to specifying >> the position of the spectrum I shall write ... (-st_shift .75) and then I

Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

On Wed, Jun 29, 2011 at 1:56 PM, Omar Al-Abbasi wrote: > Thanks for the suggestions. > John are you suggesting that within my Libmesh code and prior to specifying > the position of the spectrum I shall write ... (-st_shift .75) and then I > specify the spectrum to LARGEST_MAGNITUDE ?? You specify

Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

Thanks for the suggestions. John are you suggesting that within my Libmesh code and prior to specifying the position of the spectrum I shall write ... (-st_shift .75) and then I specify the spectrum to LARGEST_MAGNITUDE ?? I would appreciate your help. Omar ---

Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

On Wed, Jun 29, 2011 at 1:14 PM, John Peterson wrote: > On Wed, Jun 29, 2011 at 12:46 PM, Omar Al-Abbasi wrote: >> Hi, >> >> I am using Libmesh with Slepc for solving the eigen system that I have. I >> know that in Slepc there is an option to search for eigenvalues around >> specific target (say

Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

On Wed, Jun 29, 2011 at 12:46 PM, Omar Al-Abbasi wrote: > Hi, > > I am using Libmesh with Slepc for solving the eigen system that I have. I > know that in Slepc there is an option to search for eigenvalues around > specific target (say eigenvalues around 0.75), so is there a way in Libmesh > to sp

Re: [Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

On Wed, 29 Jun 2011, Omar Al-Abbasi wrote: > I am using Libmesh with Slepc for solving the eigen system that I have. I > know that in Slepc there is an option to search for eigenvalues around > specific target (say eigenvalues around 0.75), so is there a way in Libmesh > to specify this target ra

[Libmesh-users] Setting a target eigenvalue rather than selecting the position of spectrum

Hi, I am using Libmesh with Slepc for solving the eigen system that I have. I know that in Slepc there is an option to search for eigenvalues around specific target (say eigenvalues around 0.75), so is there a way in Libmesh to specify this target rather than setting the position of the spectrum t

[Libmesh-users] System matrix

Dear all, Is there a way to have tell a TransientLinearImplicitSystem to assemble the matrix then get the SparseMatrix that it has assembled? I want to construct a PetscMatrix out of that to pass to Tao. Best, Ata -- Al