Assume that mean of some weighted data calculated. $m=\frac{\sum_{i=1}^{n} w_i x_i}{\sum_{i=1}^{n} w_i}$
i want to calculate $C=\sum_{k=1}^{n}w_i x_i x_i^T$
But i dont have access to any $x_i$.
I only got $m$ and every $w_i$.
Is there any relation between these variables?
Regards.
