|
From: | Marc Tfardy |
Subject: | Re: Problem with position and find (cl) |
Date: | Sat, 21 Jun 2008 12:07:02 +0200 |
User-agent: | Thunderbird 2.0.0.14 (Windows/20080421) |
Thierry Volpiatto schrieb:
Florian Beck <abstraktion@t-online.de> writes:Marc Tfardy <m-t-o___CUT__IT@web.de> writes:Marc Tfardy schrieb:I try with: (member '(2) '((1) (2) (3) (4)))`member' tests the components: ›2‹ ist always equal (in the sense of »eq«) to ›2‹ Compare: (memq '(2) '((1) (2) (3) (4))) (eq 2 2) (eq '(2) '(2))and this gives a expectet results ((2) (3) (4)), but: (find '(2) '((1) (2) (3) (4))) or (position '(2) '((1) (2) (3) (4))) returns nil. Why?Because the first and the second »(2)« have the same components but are *different* lists.But this works: (position '(2) '((1) (2) (3) (4)) :test (lambda (x y) (eq (car x) (car y))))
position default test is 'eq, try 'equal
Thanks! It works with equal. But I have another problem. find (and find-if) returns only first match. Is there another function that returns all matched elements. Some example:(find-if-all (lambda (x) (if (eq (nth 2 x) 'byte) t nil)) '((1.1 "x" int) (2.2 "y" byte) (3.3 "q" int) (4.4 "b" byte) (5.5 "a" float)))
should returns: ((2.2 "y" byte) (4.4 "b" byte)) I found in cl-*.el nothing like this. Any hints? regards Marc
[Prev in Thread] | Current Thread | [Next in Thread] |