| comm | - MPI communicator
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| m | - number of local rows (or PETSC_DECIDE to have calculated if M is given)
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| n | - number of local columns (or PETSC_DECIDE to have calculated if N is given)
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| M | - number of global rows (or PETSC_DETERMINE to have calculated if m is given)
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| N | - number of global columns (or PETSC_DETERMINE to have calculated if n is given)
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| spacedim | - dimension of the space coordinates
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| coords_target | - coordinates of the target
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| coords_source | - coordinates of the source
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| kernel | - computational kernel (or NULL)
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| kernelctx | - kernel context (if kernel is NULL, the pointer must be of type htool::VirtualGenerator<PetscScalar>*)
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| -mat_htool_min_cluster_size <PetscInt> | - minimal leaf size in cluster tree
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| -mat_htool_max_block_size <PetscInt> | - maximal number of coefficients in a dense block
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| -mat_htool_epsilon <PetscReal> | - relative error in Frobenius norm when approximating a block
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| -mat_htool_eta <PetscReal> | - admissibility condition tolerance
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| -mat_htool_min_target_depth <PetscInt> | - minimal cluster tree depth associated with the rows
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| -mat_htool_min_source_depth <PetscInt> | - minimal cluster tree depth associated with the columns
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| -mat_htool_compressor <sympartialACA, fullACA, SVD> | - type of compression
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| -mat_htool_clustering <PCARegular, PCAGeometric, BounbingBox1Regular, BoundingBox1Geometric> | - type of clustering
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