On 7/26/23 12:17, Najwa Alshehri wrote:
Regarding the function "VectorFucntionFromScalarFunctionObject," I have
observed that it works for computing the L2 norm of the error. However, when I
attempted to compute the H1_seminorm of the error, I noticed that the gradient
was not implemented for this function. Please let me know if my understanding
is incorrect, as I referred to the <deal.II/base/function.h> for this.
Yes, correct. Someone needs to implement
VectorFucntionFromScalarFunctionObject::gradient()
and/or
VectorFucntionFromScalarFunctionObject::gradient_list()
in exactly the same way as the value() and value_list() functions are
implemented.
Could you kindly advise me on the simplest way to accomplish this?
The easiest way is to create a class derived from
VectorFucntionFromScalarFunctionObject in your own project that implements the
missing function. The better way is to write a patch to the deal.II sources
that implements the missing function because then others can use your work in
the future as well :-)
On a side note, although "VectorFucntionFromScalarFunctionObject" works with
the L2 norm of the error, it is quite computationally intensive.
It isn't VectorFucntionFromScalarFunctionObject that's expensive, but the
FEFieldFunction. That's sort of inherently the case with this class. If you
can, it should be avoided and you should try an evaluate the FE field you have
at regular quadrature points, via FEValues.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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