New answers tagged sparse-arrays
4
You seem to do something wrong because the LIL you provide is more suitable to assemble the transpose of the desired matrix in CRS format (or to assemble the desired matrix in CCS format). Since Mathematica uses CRS, I show you how to assemble the transpose.
First two compiled helper functions:
getColumnIndices = Compile[{{p, _Integer, 1}, {a, _Integer, 2}},
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