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I'm sorry, missed that. Replace this line:

((not (listp exp)) "x")

with this line:

((not (listp exp)) (string exp))

Cheers,

On 04/25/2012 10:13 AM, Longdexin wrote:
> (defun conv (exp)
>   (cond 
>    ((not (listp exp)) "x")
>    ((equal (first exp) '+)
>     (concatenate 'string "Plus[" (conv (second exp)) "," (conv (third exp)) "]"))
>
> The lines above are from the file 'convertToMathematic.lisp', lying in the 
> ec/app/regression/ directory.
>
> The third line, '((not (listp exp)) "x")',seems to mean that, if what I get is not 
> a list expression, then I will replace it with "x". This file works fine with a 
> function who has only one variable. However, if  the intention is to transform 
> a Lisp s-expression with more than one variables, like "x","y" and "z", then 
> what should I do to make the change?
>


-- 
Alexander Yakushev

"If or if-not. There is no try..catch-based flow control in Clojure."
-- Master Joda