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For a nonsingular lower or upper triangular square matrix $A$, how to solve such linear system in Eigen:

$$A x = b$$

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As documented here:

x = A.triangularView<Upper>().solve(b);

or

x = A.triangularView<Lower>().solve(b);
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  • $\begingroup$ thank you for answering so many of my Eigen related questions! $\endgroup$ – LCFactorization Feb 10 '14 at 9:49

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