On 08/09/2017 05:40 PM, ky...@math.uh.edu wrote:
I did try looking at the documentation for FEValuesViews::Vector
<http://www.dealii.org/8.5.0/doxygen/deal.II/classFEValuesViews_1_1Vector.html><
dim, spacedim >::hessian(const unsigned int shape_function, const unsigned int
q_point) before coming here, and all it provides is
"Return the Hessian (the tensor of rank 2 of all second derivatives) of the
vector components selected by this view, for the shape function and quadrature
point selected by the arguments."
Yes, the FEValuesViews::Vector::hessian(i,q) function returns the Hessian of
the i'th shape function at the q'th quadrature point as a matrix. I think that
ought to be clear.
The get_function_hessians() function returns a vector of tensors, which are
the hessians of the solution at the quadrature points.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
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