Re: simple... bug?

[Alan Mackenzie]

Joe Corneli <jcorneli@math.utexas.edu> wrote on Tue, 14 Oct 2003 02:17:11
-0500:

> (defun squares (list-of-numbers)
>   (let ((list-of-squares nil)
>   (i 0)
>   (L (length list-of-numbers)))
>     (while (< i L)
>       (setq list-of-squares (append list-of-squares 
>                                       (list (* (nth i list-of-numbers)
>                                                            (nth i
>   list-of-numbers)))))
>       (setq i (1+ i))))
>   list-of-squares)

> For

> (squares '(2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79
> 83 89 97))

> I get

>      *
> (4 9 9 25 49 121 169 289 361 529 841 961 1369 1681 1849 2209 2809 3481
> 3721 4489 5041 5329 6241 6889 7921 9409)


> Emacs is 21.3.1
> OS is  Mac OS X 10.3

>             Am I making some _extremely_ subtle mistake?

What on earth is the value "list-of-squares" that you're returning?  It's
not the one you bound in the "let" form.  :-)

Hey, I do things like this too.  It makes me feel really stupid.
Something I've done approximately three times in the last three months is
to write this form:

(\= (point) here)

It didn't do what I wanted.  But thank goodness for edebug.  :-(

> Joe

-- 
Alan Mackenzie (Munich, Germany)
Email: aacm@muuc.dee; to decode, wherever there is a repeated letter
(like "aa"), remove half of them (leaving, say, "a").