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Matrix classes for matrices that are block-tridiagonal and sparse, and simply "block sparse". These talk together, and furthermore containts an algorithm for inversion of the block-tridiagonal version. Much faster than the numpy and scipy equivalents when a particular matrix is block tridiagonal and large enough.
Original code for the "A note on an inversion algorithm for vertical ionograms for the prediction of plasma frequency profiles" paper arXiv:2411.09215.