In the case of quality, the upper-right quadrant of the 2 x 2 matrix is not just misleading; it does not exist. Quality exists on a diagonal. Here is a brand-business marketing tip: Get rid of the ...

then its inverse matrix Ai is n-by-n and the matrix product of Ai * A is the n-by-n Identity matrix (1s on the upper-left to lower-right main diagonal, 0s off the diagonal). An analogy in ordinary ...

You can use the ASINGULAR=, MSINGULAR=, and VSINGULAR= options to set three singularity criteria for the inversion of the Hessian matrix H. The singularity criterion used for the inversion is where ...