I preallocate a sparse matrix 1107648x1107648 at the beginning. I
checked all indices when filling the matrix with MatSetValues and they
are all smaller than 1107648.
Just to give you some time measurements:
1 MPI - hangs
2 MPI - hangs even after 20 min no change
3 MPI - 21s for assembly
4 MPI -
From: petsc-users-bounces at mcs.anl.gov [petsc-users-bounces at mcs.anl.gov]
On Behalf Of Jed Brown [jedbr...@mcs.anl.gov]
Sent: Monday, July 11, 2011 7:38 PM
To: PETSc users list
Subject: Re: [petsc-users] Field dependent stencil in DAs
On Mon, Jul 11,
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Dear all,
I have assembled a 2d matrix through the FormJacobianLocal() routine.
I would like to store this sparse MXN matrix A in the following form:
line1: M N numberofnonzeros
line2: i j value
line3: i j
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from the AIJ
structure?
Get the indices using MatGetRowIJ() and the values using MatGetArray().
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their experiments
lead.
-- Norbert Wiener
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Jed,
I think the format is useful to serialize a matrix into MATLAB format.
Typically, you could do something like
nnz = 1 ;
index = zeros(nnz,3);
index = [
1 1 1.0
];
A = spconvert(index);
I am unsure if PETSC_VIEWER_MATLAB already provides this functionality
for matrices. The document for
.
You mean the ASCII MATLAB format? You can view binary matrices to Matlab
without any text representation.
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Yes, but a binary viewer should be used for this instead.
Agreed. But for small problems in debug scenarios, it is useful to
check the entries in ascii format.
You mean the ASCII MATLAB format? You can view binary matrices to Matlab
without any text representation.
Yes. Do you mean the
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Rebecca,
We have private routines MatConvertToTriples_xxx_xxx()
in ~petsc/src/mat/impls/aij/mpi/mumps/mumps.c
which convert petsc seqaij and mpiaij to triples: row[], col[], val[] .
You may take a look at these routines.
Hong
On Thu, Jul 14, 2011 at 1:37 PM, Xuefei (Rebecca) Yuan xyuan at
Dear Hong,
Thanks very much! I have aij, so it is the
MatConvertToTriples_seqaij_seqaij()
I need to call after get the global matrix?
Thanks,
Rebecca
On Jul 14, 2011, at 12:05 PM, Hong Zhang wrote:
Rebecca,
We have private routines MatConvertToTriples_xxx_xxx()
in
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Ethan,
Excellent.
I have the matlab programs in a subdirectory called matlab. Will there be
several of these? So should we have a bin/python subdirectory for them?
Barry
On Jul 14, 2011, at 2:22 PM, Ethan Coon wrote:
Attached patch takes Lisandro's matio.py and puts it in a
I suppose it's possible, eventually. Much of the matlab stuff is
related to the socket and the wrappers, which exist in petsc4py
instead. There may be a few though -- PetscBinaryWrite.py at least.
Ethan
On Thu, 2011-07-14 at 14:38 -0500, Barry Smith wrote:
Ethan,
Excellent.
I
On 14 July 2011 16:22, Ethan Coon ecoon at lanl.gov wrote:
Attached patch takes Lisandro's matio.py and puts it in a
PetscBinaryRead.py that reads a binary with (potentially) multiple Petsc
objects, deciphers the contents of the file from the header, and returns
numpy objects. ?It's basically
On Thu, 2011-07-14 at 17:47 -0300, Lisandro Dalcin wrote:
1) readMatDense() is wrong. The I,J,V arrays are the CSR structure,
not the COO (coordinate) format, Then you cannot simply:
for i,j,v in zip(I,J,V):
mat[i,j] = v
I think you have to:
for row, rstart in
On 14 July 2011 18:33, Ethan Coon ecoon at lanl.gov wrote:
On Thu, 2011-07-14 at 17:47 -0300, Lisandro Dalcin wrote:
1) readMatDense() is wrong. The I,J,V arrays are the CSR structure,
not the COO (coordinate) format, Then you cannot simply:
Ok, thanks, I wasn't sure of which format you
Is there a straightforward way to perform a pointwise divide of every DOF in a
global Vec with multiple degrees of freedom by another vector that has only one
degree of freedom? Thanks for your help.
Max
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