| 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 | - coordinates of the points
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| cdist | - whether or not coordinates are distributed
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| kernel | - computational kernel (or NULL)
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| kernelctx | - kernel context
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| eta | - admissibility condition tolerance
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| leafsize | - leaf size in cluster tree
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| basisord | - approximation order for Chebychev interpolation of low-rank blocks
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