| Re: [eigen] Calculation of weighted norm |
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On 02/04/12 11:08, Christoph Hertzberg wrote:
> On 02.04.2012 10:14, Claas H. Koehler wrote:
>> Hi!
>>
>> I was wondering about the best way to calculate the weighted square norm of a complex vector, i.e.
>>
>> x^t A x
>>
>> where x is a complex vector and A is a real diagonal matrix. [...]
>
> If A is a diagonal, this is equivalent to:
>
> double norm2 = x.cwiseAbs2().cwiseProduct(A).sum();
>
> assuming A is just the vector storing the diagonal entries.
Thank you, Christoph. I like this much better than my original solution.
Regards
Claas