ranocha / SummationByPartsOperators.jl / 13885399063

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Add `MultidimensionalMatrixDerivativeOperator` and 2D tensor product operators (#324)

* add implementation of MultidimensionalMatrixDerivativeOperator and 2D tensor product operators

* add references to docstring

* introduce AbstractMatrixDerivativeOperator

* add 1D tests for MultidimensionalMatrixDerivativeOperator

* add initial tests for tensor product operators

* add more tests for tensor product operators

* add more tests

* put integrate_boundary into a function in tests

* add docstring for integrate_boundary

* put mass_matrix_boundary and integrate_boundary into src

* use Diagonal instead of dense identity matrix

* use sparse differentiation matrix

* test integrate_boundary and allow not passing func

* fix test

* add comments

* add accuracy tests for tensorprodict operators

* different real types for tensor product operators

* add test for codecov

* try different operators in different directions

* fix test

* Apply suggestions from code review

Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>

* preserve type of coefficients in nodes

* remove mul! TODO note

* fix number of boundary weights

* add SourceOfCoefficientsCombination

* test show method of SourceOfCoefficientsCombination

* also test number of sources

* use boundary_indices instead of on_boundary

* N_boundary is not necessarily smaller than N anymore

* clarify boundary_indices in docstring

* put TensorProductOperators in an own struct

* small docstring changes

* remove debug statements

* fix typo

* fix comment

* add comment on sorting of nodes

* add comment about choice of weights_boundary again

* fix nomeclature

* square -> rectangle

* Apply suggestions from code review

Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>

* set normals as vector of integers

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Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>

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