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kouddy/SICP 2.37

Created April 27, 2015 02:25
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SICP 2.37
(define (dot-product v w)
(accumulate + 0 (map * v w)))
(define (matrix-*-vector m v)
(map (lambda (row) (dot-product row v))
m))
(define (transpose mat)
(accumulate-n cons null mat))
(define (matrix-*-matrix m n)
(let ((cols (transpose n)))
(map (lambda (row)
(map (lambda (col)
(dot-product row col))
cols))
m)))
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