Wasn't it Leo80s who wrote:
>> #declare Factorial =
>>   function(A) { select(A, 1, 1, A*Factorial(A-1)) };
>>
>> #declare Value = Factorial(8);
>> #debug concat("Factorial of 8 is ", str(Value, 0, 0), "n")
>
>Hi Warp,
>I tried your piece of code and it works but I need to use recursion with
>element of an array...so I've modified your code in this way:
>
>#declare w= array [10];
>
>....[assigning integer value to w elements]
>
>#declare Factorial =
>   function(A) { select(A, 1, 1, w[A]*Factorial(A-1)) };
>
>compiling, I've obtained this error (related on w[A]):
>
>Parse Error: Expected 'numeric expression', undeclared identified 'A' found
>instead ...
>
>But why??? A is sure not initialited (but it's a parameter...) but why
>undeclared?!?!

There's some info on using arrays in isosurface functions here:

http://www.econym.demon.co.uk/isotut/arrays.htm

The problem is that arrays are evaluated at parse time, and function
parameters are evaluated at render time. During the parse phase, A is
indeed undefined. 

-- 
Mike Williams
Gentleman of Leisure

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