Benoit Jacob a1ba995f05 Many improvements in LLT and LDLT: ...

* in LDLT, support the negative semidefinite case
* fix bad floating-point comparisons, improves greatly the accuracy of methods like
  isPositiveDefinite() and rank()
* simplifications
* identify (but not resolve) bug: claim that only triangular part is used, is inaccurate
* expanded unit-tests

2009-03-30 21:45:45 +00:00

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