> (setq c (identity-matrix 3)) #2A((1 0 0) (0 1 0) (0 0 1)) > (%* c a) (1 2 3) > (%* c b) (2 3 4) > (%* b c) (2 3 4) > (%* c c) #2A((1 0 0) (0 1 0) (0 0 1)) > (setq d (+ c c)) #2A((2 0 0) (0 2 0) (0 0 2)) > (inverse d) #2A((0.5 0 0) (0 0.5 0) (0 0 0.5)) > (matmult d (inverse d)) #2A((1 0 0) (0 1 0) (0 0 1))
> (setq a (make-array '(2 2) :initial-contents '((1 2) (3 4)))) #2A((1 2) (3 4)) > (determinant a) -2.0 > (inverse a) #2A((-1.9999999999999996 0.9999999999999998) (1.4999999999999998 -0.4999999999999999))