zero out columns

ot likely to be efficient and I am not really considering this. I am wondering if anyone has a clue as to which of the methods above is likely to be more efficient for large parallel sparse matrices. Perhaps someone may have a suggesttion for an alternative approach. Thanks in advance. Best, Toby

wierd behaviour from MatGetRow?

matrix value is zero! ...but if the matrix element has been set to zero, why does MatGetRow tell mne this? Should not MatGetRow see that it is zero and return nothing? Is this behaviour be correct? I'd be interested to know it seems like a riddle to me. Thanks. Best, Toby --

Simple question

needed to be symmetry verified. Thanks! Best, Toby -- Toby D. Young ( Adiunkt ) Department of Computational Science Institute of Fundamental Technological Research, Polish Academy of Sciences, Room 206, Swietokrzyska 21, 00-049 Warsaw, POLAND

MatZeroColsIS question.

ncieved of or could suggest a more effective approach for constructing a MatZeroColsIS? I welcome any response / advice and thank you in advance. Best, Toby I am using c++ (gcc 4.1.0) and petsc 2.3.0. -- Toby D. Young ( Adiunkt ) Department of Computational Science Institute of F

More wierd behaviour from MatIsSymmetric?

Truth, PETSC_FALSE 347: M*/ 349: /*MC 350: PETSC_YES - Alias for PETSC_TRUE 352: Level: beginner 354: Note: Zero integer 356: .seealso: PetscTruth, PETSC_TRUE, PETSC_FALSE, PETSC_NO 357: M*/ -- Toby D. Young - Adiunkt (Assistant Professor) Department of Computational Science Institu

MatTranspose Question

on in anyone's book. As far as I know, PETSc does not store zero-components of a matrix but uses a sparsity pattern to "remember" them... (Someone please correct me if I am wrong). Hope that is somehow helpful for you. Best, Toby - Toby D. Young - Adiunkt (Assistant

MatTranspose Question

ng a new matrix? If this is possible it will definately save you some time. > However, I am wondering if there is something I'm doing that is > really wrong in some way. I don't suppose you are doing anything particuarily wrong... I can not guess without first seeing your particular

Installing Petsc

> Possible ERROR while running linker: gcc: opci?n '-PIC' no reconocida > gcc: opci?n '-PIC' no reconocida Try compiling with option `-fPIC' (not `-PIC'). Best, Toby - Toby D. Young - Adiunkt (Assistant Professor) Department of Computatio

MatTranspose

an efficient way to destroy the original matrix, thus keeping the transpose only? Can anyone please clarify for me what this statement means? ...and finally thanks to all for answering my previous confused questions. :-) Best, Toby -- Toby D. Young - Adiunkt (Assistant Prof

MatTranspose

Problem cleared up.:-) Thank you Matt and Satish! Best, Toby - Toby D. Young - Adiunkt (Assistant Professor) Department of Computational Science Institute of Fundamental Technological Research Polish Academy of Sciences Room 206, ul. Swietokrzyska 21 00-049 Warszawa, Polska +48

Self-consistent problems

guessing that a binary save, destroy matrix, binary load, then solve is the best way forward. Any suggestions are very welcomed. Best, Toby - Toby D. Young - Adiunkt (Assistant Professor) Department of Computational Science Institute of Fundamental Technological Research Polish Academy

petsc 3.0.0 test woes

e on the PETSc website which documents these changes I can look at. Many thanks. Best, Toby -- Toby D. Young Adiunkt (Assistant Professor) Philosopher-Physicist Department of Computational Science Institute of Fundamental Technological Research Polish Academy of Sciences Room 206, ul. Swiet

possible error error message on "make tests"

;possible error" mean? ie; can I ignore it safely? I am not competent enough to understand why this happens. Thanks. Best, Toby -- Toby D. Young Adiunkt (Assistant Professor) Philosopher-Physicist Department of Computational Science Institute of Fundamental Technological Resear

cast unsigned int* -> PetscInt*

Hello PETSc users, I want to convert an unsigned int* to PetscInt*. Is there a simple way to do this? My reason is, that I wish to protect in my application code from asking for a negative number of eigenvalues to be computed (in SLEPc). Thanks. Best, Toby - Toby D. Young

no parallel speedup with slepc krylovschur

mpicc??? Best, Toby - Toby D. Young Philosopher-Physicist Adiunkt (Assistant Professor) Polish Academy of Sciences Warszawa, Polska www: http://www.ippt.gov.pl/~tyoung skype: stenografia

no parallel speedup with slepc krylovschur

ur code tomorrow and report anything if something. Best, Toby - Toby D. Young Philosopher-Physicist Adiunkt (Assistant Professor) Polish Academy of Sciences Warszawa, Polska www: http://www.ippt.gov.pl/~tyoung skype: stenografia

PCILUSetFill in 3.0.0

Check the documentation or (better) ask Barry Smith directly. Then let me know about it and I will write a patch for us deal.ii.ers. I will gladly submit a patch for this. Throw something at me like an error message ;-) Cheers, Toby ----- Toby D. Young Philosopher-Physicist Adiunkt (

[petsc-users] Unexpected error in compile

guess a part of the UNIX base system(?) I've never seen this error message... :-( Thanks in advance for any pushes. Best, Toby ----- Toby D. Young Assistant Professor Philosophy-Physics Polish Academy of Sciences Warszawa, Polska www: http://www.ippt.gov.pl/~tyoung skype: stenografia

[petsc-users] Unexpected error in compile

> It looks like your MPI installation was not built with Fortran bindings. Was > it? Oops, no it wasn't. I made a couple of other related errors too, but PETSc configure system walked me through those All is good now. Thanks Matt. Best, Toby ----- Toby D. Youn

[petsc-users] query on meaning of libmpiuni.*

Greetings, I am very curious to understand why libmpiuni is there PETSc and how he is implemented by PETSc and PETSc-based programs. I understand that this library can be built as static or dynamic; right? I also understand that this library is used when PETSc is compiled with MPI, but the progr

[petsc-users] query on meaning of libmpiuni.*

Thanks Jed, that more-or-less covers everything I wanted to know! Best, Toby - Toby D. Young Assistant Professor Philosophy-Physics Polish Academy of Sciences Warszawa, Polska www: http://www.ippt.gov.pl/~tyoung skype: stenografia On Mon, 1 Mar 2010, Jed Brown wrote: > On

[petsc-users] query on meaning of libmpiuni.*

One final question please: > I understand that this library can be built as static or dynamic; right? Then I look at my build, and only libmpiuni.a appears. Why is that? Can a libmpiuni.so exist? I build --with-shared=1. Thanks. Toby - Toby D. Young Assistant Professor Philoso