MatCreateH2OpusFromMat#

Creates a MATH2OPUS sampling from a user-supplied operator.

Synopsis#

PetscErrorCode MatCreateH2OpusFromMat(Mat B, PetscInt spacedim, const PetscReal coords[], PetscBool cdist, PetscReal eta, PetscInt leafsize, PetscInt maxrank, PetscInt bs, PetscReal rtol, Mat *nA)

Input Parameters#

  • B - the matrix to be sampled

  • spacedim - dimension of the space coordinates

  • coords - coordinates of the points

  • cdist - whether or not coordinates are distributed

  • eta - admissibility condition tolerance

  • leafsize - leaf size in cluster tree

  • maxrank - maximum rank allowed

  • bs - maximum number of samples to be taken concurrently

  • rtol - relative tolerance for construction

Output Parameter#

  • nA - matrix

Options Database Keys#

  • -mat_h2opus_leafsize <PetscInt> - Leaf size of cluster tree

  • -mat_h2opus_eta <PetscReal> - Admissibility condition tolerance

  • -mat_h2opus_maxrank <PetscInt> - Maximum rank when constructed from matvecs

  • -mat_h2opus_samples <PetscInt> - Maximum number of samples to be taken concurrently when constructing from matvecs

  • -mat_h2opus_rtol <PetscReal> - Relative tolerance for construction from sampling

  • -mat_h2opus_check <PetscBool> - Check error when constructing from sampling during MatAssemblyEnd()

  • -mat_h2opus_hara_verbose <PetscBool> - Verbose output from hara construction

  • -mat_h2opus_normsamples <PetscInt> - Maximum number of samples to be when estimating norms

Note#

Not available in parallel

See Also#

Matrices, Mat, MatCreate(), MATH2OPUS, MatCreateH2OpusFromKernel()

Level#

intermediate

Location#

src/mat/impls/h2opus/cuda/math2opus.cu

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