Elegant Array?

[David]

Greetings,
I am relativly new to the use of array formulas so please
bear with me. I have the following array formula:
{=SUM(INDEX((TRANSPOSE(vector)*matrix),(ROW()-ROW(matrix)
+1),0))/SUM(INDEX(matrix,(ROW()-ROW(matrix)+1),0))}
This formula is copied to each cell in a column range
corresponding with each row in "matrix" It achieves the
required result but I wonder if there is a more elegant
way of writing it?
TIA,
David