Perhaps the word "incorrect" was a poor choice of words. I'm used to seeing 
a simpler definition:

For any real number a, the absolute value of a, is denoted | a | , and is 
defined as:



"Mike Raiford" <mraiford [at] hotmailcom> wrote in message 
news:4343f9c5$1@news.povray.org...
> Kenneth wrote:
>> Warp <warp [at] tagpovrayorg> wrote:
>>> Ken Hutson <ken.hutson [at] goettingcom> wrote:
>>>> This is incorrect.
>>>> abs(A) Absolute value of A. If A is negative, returns -A otherwise 
>>>> returns
>>>> A.
>>>   How is it incorrect?
>>>
>>> --
>>>                                                           - Warp
>>
>> abs(A) will ALWAYS return a positive value (or zero, of course.). AFAIK,
>> that's what "absolute" means.
>>
>>
>
> Quick quiz: What is the negative of a negative number. (Hint: its not a
> double negative...)
>
> -- 
> ~Mike
>
> Things! Billions of them!

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