Thanks again Mike.

Yeah, I'm sorry, I've forgotten to put "3*sin" and to put at the end "}".
Your solution:
=======================================
#declare F6 = function { F4(x,y,z)*F5(x,y,z) }
=======================================
It sounds great.

I will play with the splines examples and I will post my questions later.

Regards,
Oleguer






news:nND### [at] econymdemoncouk...
> Wasn't it Oleguer Vilella who wrote:
>>Hi all,
>>
>>I was reading that I can use a spline like a function. Can anyone give me 
>>an
>>example?
>>It says: SPECIAL_VECTOR_FUNCTION:
>>    TRANSFORMATION_BLOCK | SPLINE
>>How I have to introduce the spline?
>>
>>I declare a function like this:
>>======================================
>>#declare F4 = function { y-(x/3/8)+9-(z/3/8) }
>>======================================
>>
>>Why if I do this the program gives me an error:
>>======================================
>>#declare F4 = function { y-(x/3/8)+9-(z/3/8) }
>>#declare F5 = function { y-cos(x/3/5)-3sin(z/3/8)
>>#declare F6 = F5*F6;
>>======================================
>
> Examples of spline functions can be found at
>
> <http://www.econym.demon.co.uk/isotut/more.htm>
>
> Your F4 is OK.
>
> Your F5 needs to say "3*sin" not "3sin"
>        and needs a "}" at the end
>
> I'm not sure what you intended F6 to mean. Perhaps you meant:
>    #declare F6 = function {F4(x,y,z)*F5(x,y,z)}
>
>
> -- 
> Mike Williams
> Gentleman of Leisure

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