Max Ulbrich wrote:
> Hi,
> 
> I try to get a sum over an expression that contains data of an array.

As you already have been told elsewhere you have to understand the 
difference between render time functions and parse time code.

The difference is explained in:

http://www.povray.org/documentation/view/3.6.1/231/#s02_02_01_06_02

Since neither the loop parameters nor the array indices depend on the 
function parameters you can probably do what you are trying to do with a 
macro but the parameters of the macros are parse time variables, not 
render time ones.

Examples for the use of macros for generating functions can be found in 
the IsoCSG library:

http://www.tu-bs.de/%7Ey0013390/pov/ic/index.html


Christoph

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