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Eigen-unsupported
3.2.5
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use a SparseMatrix in an uncompressed mode
use insert() inserts a nonzero coefficient at given coordinates row, col and returns its reference assuming that: 1 - the coefficient does not exist yet 2 - this the coefficient with greater inner coordinate for the given outer coordinate. In other words, assuming *this
is column-major, then there must not exists any nonzero coefficient of coordinates i
x
col such that i
>= row. Otherwise the matrix is invalid.