eigen - C++ library for linear algebra

	Commit message (Collapse)	Author	Age
*	- introduce Part and Extract classes, splitting and extending the former	Benoit Jacob	2008-05-27
\| \| \| \| \| \| \| \| \| \|	Triangular class - full meta-unrolling in Part - move inverseProduct() to MatrixBase - compilation fix in ProductWIP: introduce a meta-selector to only do direct access on types that support it. - phase out the old Product, remove the WIP_DIRTY stuff. - misc renaming and fixes
*	Added Triangular expression to extract upper or lower (strictly or not)	Gael Guennebaud	2008-04-26
\| \| \| \| \| \| \| \| \| \| \|	part of a matrix. Triangular also provide an optimised method for forward and backward substitution. Further optimizations regarding assignments and products might come later. Updated determinant() to take into account triangular matrices. Started the QR module with a QR decompostion algorithm. Help needed to build a QR algorithm (eigen solver) based on it.
*	fix a bug in determinant of 4x4 matrices and a small type issue in Inverse	Gael Guennebaud	2008-04-26
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*	- optimized determinant calculations for small matrices (size <= 4)	Benoit Jacob	2008-04-14
	(only 30 muls for size 4) - rework the matrix inversion: now using cofactor technique for size<=3, so the ugly unrolling is only used for size 4 anymore, and even there I'm looking to get rid of it.