< Note that base could be any PS expression, so you can't assume that it is a number at compile-time. >
 
You're absolutely right. Thanks!  I was using PS's = in a CL expression.
 
Dan
 
 
On Mon, Mar 31, 2008 at 4:56 PM, Travis Cross <travis@travislists.com> wrote:
Daniel Gackle wrote:
> I wrote a simple ps macro to work like CL's log. It seems like a
> candidate for inclusion in PS itself.
>
> (defpsmacro log (number &optional base)
>   (cond ((null base) `(*math.log ,number))
>   ((= base 10) `(* (log ,number) *math.*log10e*))
>   (t  `(/ (log ,number) (log ,base)))))

Hi Daniel--

I added a LOG psmacro along these lines to the repository.  Note that
base could be any PS expression, so you can't assume that it is a number
at compile-time.

I also pushed a more CL-like version of ATAN and the missing SQRT function.

Cheers,

-- Travis