__construct() __construct( $A) : \Structure LU Decomposition constructor. Parameters $A Rectangular matrix Returns \Structure — to access L, U and piv.
isNonsingular() isNonsingular() : true Is the matrix nonsingular? Returns true — if U, and hence A, is nonsingular.
solve() solve( $B) : \X Solve A*X = B Parameters $B A Matrix with as many rows as A and any number of columns. Returns \X — so that LUX = B(piv,:)