RosettaCodeData/Task/Matrix-multiplication/Common-Lisp/matrix-multiplication-5.lisp

14 lines
482 B
Common Lisp

(defun mmult (a b)
(loop
with m = (array-dimension a 0)
with n = (array-dimension a 1)
with l = (array-dimension b 1)
with c = (make-array (list m l) :initial-element 0)
for i below m do
(loop for k below l do
(setf (aref c i k)
(loop for j below n
sum (* (aref a i j)
(aref b j k)))))
finally (return c)))