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cholesky: triangular linear solver: gsl_linalg_cholesky_svx #86

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The gsl_linalg_cholesky_svx is an easy way to achieve the triangular linear solver for one output from cholesky decomposition and one vector. In this algorithm, we only need one forward substitution, while the backward substitution is only used for the context, where the user manually transposes the result from gsl_linalg_cholesky_decomp.

Qilong Pan and others added 2 commits September 12, 2024 13:40
comment the backward, which is not used for this case
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