How to view petsc matrix

Author: kahq

August undefined, 2024

Web6 jun. 2016 · >>I am learning petsc and using the following code to insert values into my matrix: >>ierr = MatSetValue(A, row, col, value,INSERT_VALUES); >ierr = … Web30 apr. 2015 · from dolfin import * mesh = UnitSquareMesh ( 10, 10 ) V = FunctionSpace (mesh, 'CG', 1 ) u = TrialFunction (V) v = TestFunction (V) M = PETScMatrix () assemble (inner (u, v)*dx, tensor=M) Mmat = M.mat () print type (Mmat) Mcopy = Mmat.duplicate () Mcopy.zeroEntries () print Mcopy.getRow ( 3 ) print Mmat.getRow ( 3 ) print M.getrow ( 3 )

How to construct petsc matrices? - Stack Overflow

WebWe start by setting up a PETSc program. To utilize the matrix class, we need to include petscmat.h which automatically includes header files for basic PETSc routines, index … WebDM Basics. DMPlex: Unstructured Grids in PETSc. Representing Unstructured Grids. Dealing with Periodicity. Data on Unstructured Grids (PetscSection) Evaluating Residuals. Saving and Loading DMPlex Data with HDF5. Metric-based mesh adaptation. DMSTAG: Staggered, Structured Grids in PETSc. gifts and things holdrege

Getting Started — PETSc 3.14.1 documentation - Read the Docs

WebThe argument info->fill > 1 is the predicted fill expected in the factored matrix, as a ratio of the original fill. For example, info->fill=2.0 would indicate that one expects the factored … WebThank you for your explanation. Yujie On 1/14/08, Matthew Knepley wrote: > > On Jan 14, 2008 11:24 AM, Yujie wrote: > > Dear Matt and Hong: > > > > Based what you said, it looks like a little difficult to evalute the > matrix > > in PETSc, especailly regarding a big dimension. WebYou cannot compute all the eigenvalues for a large sparse matrix with PETSc alone. Barry On Jan 14, 2008, at 11:24 AM, Yujie wrote: > Dear Matt and Hong: > > Based what you … fs chapter 163

[petsc-users] Reading matrices into PETSc

WebThe ASCII viewers are only recommended for small matrices on at most a moderate number of processes, the program will seemingly hang and take hours for larger matrices, for larger matrices one should use the binary format. In the debugger you can do “call MatView (mat,0)” to display the matrix. (The same holds for any PETSc object viewer). Web1 Answer Sorted by: 0 If you want to view the matrix when running the codes in the console, you can use either MatView (Mat, PETSC_VIEWER_STDOUT_SELF) for … fs ch 83Web24 mrt. 2024 · - Prints matrix in Matlab format -mat_view draw - PetscDraws nonzero structure of matrix, using MatView() and PetscDrawOpenX(). -display - Sets … f schacht formel 1

"Web10 nov. 2024 · I am using petsc to solve a linear elasticity problem discretized by finite elements.The initial mesh is read by a mesh file and the distribution in each processor is done using METIS.I am using only ... finite-element pde parallel-computing petsc elasticity Spy123 21 asked Jan 28, 2024 at 16:06 2 votes 1 answer 416 views " - How to view petsc matrix

How to view petsc matrix

save and load petsc matrix in compressed format - Bitbucket

Web22 feb. 2024 · After A.creator, I try to put numpy.matrix HH in PETSc.Mat (), like the following: opts = PETSc.Options() n = opts.getInt('n', 2**N) A = PETSc.Mat() A.create() A.setSizes( [n, n]) A.setFromOptions() A.setUp() for i in range(2**N): for j in range(2**N): A[i,j] = HH[i,j] A.assemble() Then it shows http://www.jos.org.cn/html/2024/3/6785.htm

Did you know?

WebOne can dump PETSc matrices and vectors to the screen in an ASCII format that MATLAB can read in directly. This is done with the command line options -vec_view ::ascii_matlab or -mat_view ::ascii_matlab. To write a file, use -vec_view :filename.m:ascii_matlab or -mat_view :filename.m:ascii_matlab. Web- prints matrix contents, using a sparse format common among all matrix types PETSC_VIEWER_ASCII_IMPL - prints matrix contents, using an implementation …

WebGiven a PETSc matrix of type 'seqaij', we may access its compressed sparse row format and convert to that used in SciPy in the following way: import scipy.sparse as sp indptr, indices, data = petsc_mat.getValuesCSR() scipy_mat = sp.csr_matrix( (data, indices, indptr), shape=petsc_mat.getSize()) WebPETSc provides a variety of matrix implementations, since no single matrix format is appropriate for all problems. This section first discusses various matrix blocking …

Web6 aug. 2015 · Note: Never read or write in parallel an ASCII matrix file, instead for reading: read in sequentially with a standalone code based on ex72.c, ex78.c, or ex32.c then save the matrix with the binary viewer PetscBinaryViewerOpen() and load the matrix in parallel in your "real" PETSc program with MatLoad(); for writing save with the binary viewer and … WebTo determine if you need to set PETSC_ARCH, look in the directory indicated by PETSC_DIR, if there are subdirectories beginning with arch then those subdirectories …

WebPETSc Tutorial 4: Matrices 3. sequential alternative. Matrix (Mat) Mat A; PetscIntm=2, n=3, M=8, N=12; MatTypetype=MATMPIAIJ; // MATSEQAIJ,MATAIJ …

Webmatrix be supplied to PETSc? My matrix is a 2000x1900 matrix given in the format MATLAB stores sparse matrices. i.e [row, column, non-zero-entry] format. ... 205 Views … gifts and things fundraiserWebThis is extremely useful if you have to benchmark your codes written in PETSc using standard matrices coming from [Matrix Market] 1 or the [University of Florida Sparse … fs chapter 166WebOther PETSc Features; Advanced Features of Matrices and Solvers; Running PETSc Tests; C/Fortran API. Vectors and Index Sets. Vector Operations (Vec) Index sets (IS) Matrices and Matrix Operations. Matrix Operations (Mat) Matrix colorings (MatColoring), orderings (MatOrdering), and partitionings (MatPartitioning) Finite difference computation … giftsandthings holiday shopWebFeatures { PETSc components I Index Sets: permutations, indexing into vectors, renumbering. I Vectors: sequential and distributed. I Matrices: sequential and distributed, sparse and dense. I Distributed Arrays: regular grid-based problems. I Linear Solvers: Krylov subspace methods. I Preconditioners: sparse direct solvers, multigrid I Nonlinear … gifts and wishes shingle springs caWebPETSc Application Integration Parallel Sparse Matrix Each process locally owns a submatrix of contiguous global rows Each submatrix consists of diagonal and off … fs chapter 459WebThe aim of this work is to describe an efficient implementation of cubic and multiparameter real gas models in an existing discontinuous Galerkin solver to … gifts and tax implicationsWeb8 dec. 2024 · First of all we need to check the installation of petsc. from petsc4py import PETSc print ( PETSc.ScalarType) output >> Now as per Drew Parsons, the structure of the PETSc installation makes it possible to install different versions and different configurations side by side. fs chapter 713