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Utility functions for diagonal and inverse diagonal #96

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szarnyasg opened this issue Jun 21, 2020 · 1 comment
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Utility functions for diagonal and inverse diagonal #96

szarnyasg opened this issue Jun 21, 2020 · 1 comment
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szarnyasg commented Jun 21, 2020 •
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Related to #94, it would be useful to have functions for diag (for turning a vector into a diagonal matrix) and diag^{-1} (for extracting the diagonal elements of a matrix).
These could be called LAGraph_diag(GrB_Matrix* A, GrB_Vector d) and LAGraph_inv_diag(GrB_Vector &d, GrB_Matrix A, boolean diagonal_only) (diagonal_only denoting whether matrix A only has diagonal elements, which makes the extraction trivial).
@szarnyasg szarnyasg self-assigned this Jun 21, 2020
@szarnyasg szarnyasg added the enhancement New feature or request label Jun 22, 2020
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One of these is now in the spec (GrB_Matrix_diag, to build a matrix from a diagonal). The opposite, GxB_Vector_diag, to extract a diagonal from a matrix, is in SuiteSparse as a GxB method, but is not in the spec.

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