On 07/20/2017 08:02 AM, Jaekwang Kim wrote:

1. the 'grad_u' vector I actually receiving is all zero vector.... I checked and it always gives me (dudx,dudy)=(0,0) 2. I need to use p[0] value, and I believe 'evaluation_points[q](0)' is what I need.
but when I extract value I am receiving error as...


Are you passing the update_gradients and update_quadrature_points flags from your class to make sure that these two fields are actually filled?

Best
 W.

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