fix bug: with complex matrices, the condition (ei_imag(c0)==RealScalar(0)) being wrong could bypass the other condition in the &&. at least that's my explanation why the test_lu was often failing on complex matrices (it uses that via createRandomMatrixOfRank) and why that's fixed by this diff. also gcc 4.4 gave a warning about tailSqNorm potentially uninitialized
fix bug: with complex matrices, the condition (ei_imag(c0)==RealScalar(0)) being wrong could bypass the other condition in the &&.
at least that's my explanation why the test_lu was often failing on complex matrices (it uses that via createRandomMatrixOfRank)
and why that's fixed by this diff.
also gcc 4.4 gave a warning about tailSqNorm potentially uninitialized

madlib/eigen,madlib/eigen,madlib/eigen,madlib/eigen