When the sources and the mixing matrix are restricted to be non-negative, the problem can be seen as a non-negative matrix factorization (NMF) problem for which many algorithms have been developed[15].
A given translation-invariant quasifree Hamiltonian is ℛ-symmetric (i.e. [ R, H ] = 0 ) iff the coefficient matrix is restricted to be real.
In addition, the necessary condition for obtaining the optimal scale matrix is restricted to the diagonal matrix (e.g., Eq. (36)), where the off-diagonal elements are simply deleted in every iteration step thereby leading to solutions that do not ensure a true global minimum for the trace of the error matrix.
The Lp-class (p>0) of optimality criteria, which includes D-optimality, A-optimality and E-optimality as special cases, is considered in a regression setting where the experimental errors are uncorrelated with unequal variances and the design matrix is restricted to have row Euclidean norms bounded above by constants.
Unlike the present method, in the previous methods of this third category codon exchangeabilities for nonsynonymous changes were assumed to be proportional to the corresponding amino acid exchangeability [23], or a codon substitution matrix was restricted to yield amino acid exchangeabilities equal to empirically-derived ones [21].
Since polymeric materials tend to degrade at elevated temperatures, polymer-matrix composites (PMCs) are restricted to secondary structures in which operating temperatures are lower than 300° C (570° F).
Polymer matrix composites (PMCs) are restricted from being widely used in aerospace applications for their low erosion resistance.
However, the main conditions for the global robust stability are restricted by two matrix inequalities, and there are only discrete delays in the model.
It is shown how the estimation of such a matrix can be restricted to that of its corresponding coefficient matrix in the signal subspace, providing both performance enhancement and computational complexity reduction.
But they worry that Matrix will be restricted or its features somehow diminished.
