; ======================================================================
;
; Structure and Interpretation of Computer Programs
; (trial answer to excercises)
;
; 计算机程序的构造和解释(习题试解)
;
; created: code17 08/19/05
; modified:
; (保持内容完整不变前提下，可以任意转载)
; ======================================================================
;; SICP No.2.36
(define (accumulate-n op init seqs)
(if (null? (car seqs))
()
(cons (accumulate op init (map car seqs))
(accumulate-n op init (map cdr seqs)))))
;; Test-it:
;; Welcome to MzScheme version 209, Copyright (c) 2004 PLT Scheme, Inc.
;; > (accumulate-n + 0 (list (list 1 2 3)
;; (list 4 5 6)
;; (list 7 8 9)
;; (list 10 11 12)))
;; (22 26 30)
