Comments on: SICP sections 4.1.3 - 4.1.5 http://eli.thegreenplace.net/2007/12/08/sicp-sections-413-415/ Eli Bendersky's personal website Fri, 21 Nov 2008 20:53:24 +0000 http://wordpress.org/?v=2.6.2 By: eliben http://eli.thegreenplace.net/2007/12/08/sicp-sections-413-415/#comment-106618 eliben Tue, 05 Feb 2008 16:28:31 +0000 http://eli.thegreenplace.net/2007/12/08/sicp-sections-413-415/#comment-106618 I suppose you're right, I could indeed replace my home-cooked procedure with a <tt>map</tT> on <tt>cons</tt>. However, don't forget to prepend the 'frame tag. I suppose you’re right, I could indeed replace my home-cooked procedure with a map on cons.

However, don’t forget to prepend the ‘frame tag.

]]> By: Flávio Cruz http://eli.thegreenplace.net/2007/12/08/sicp-sections-413-415/#comment-105764 Flávio Cruz Mon, 04 Feb 2008 01:31:43 +0000 http://eli.thegreenplace.net/2007/12/08/sicp-sections-413-415/#comment-105764 Your make-frame from 4.11 could be more easily expressed as (scheme): (define (make-frame variables values) (if (not (= (length variables) (length values))) (error "length mismatch -- MAKE-FRAME" variables values) (map cons variables values))) Your make-frame from 4.11 could be more easily expressed as (scheme):

(define (make-frame variables values)
(if (not (= (length variables) (length values)))
(error “length mismatch — MAKE-FRAME” variables values)
(map cons variables values)))

]]>