Date: Oct 11, 2013 6:20 AM Author: Cristiano Subject: Re: How to minimize a sum On 11/10/2013 04:15, Ray Vickson wrote:

> If v_i is (sigma_ i)^ 2, the global minimum of

> sum v_i w_i ^2 occurs when w_i = c/v_i , and choose c to make sum v_i = 1: that is,

> c = 1/sum (1/v). [...]

It works. Thank you very much.

Cristiano