Dear John,
On Tue, 26 Aug 2008, John Peterson wrote:
> I'm not sure about your implementation of L_INF. You're taking
>
> ||e||_{\infty} = max_q |e(x_q)|
>
> where x_q are the quadrature points. In fact, isn't the solution
> sometimes superconvergent at the quadrature points, and therefore this
> approximation could drastically under-predict the L-infty norm?
Oh, I see, I (again) forgot that people are using different ansatz
functions than piecewise linear (for which this is obviously correct).
What about returning this value as the DISCRETE_L_INF norm instead?
In particular since the FEMNormType enum offers this norm anyway.
Best Regards,
Tim
--
Dr. Tim Kroeger Phone +49-421-218-7710
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