FE pre-requests for error estimation

[nmnobre]

FE pre-requests for error estimation

[lindsayad]

nice sleuthing!

[jwpeterson]

OK, so it's nothing to do with missing pre-requests, it's that the call to fe->get_dphi() calls HDivFETransformation::map_dphi() which is unimplemented?

even if they aren't really used anywhere

I'm not sure what you mean, dphi_values is definitely used in the ExactSolution function that you highlighted?

[nmnobre]

it's that the call to fe->get_dphi() calls HDivFETransformation::map_dphi() which is unimplemented

Indeed.

I'm not sure what you mean, dphi_values is definitely used in the ExactSolution function that you highlighted?

In the sense that, for instance for ex6/ex7, you ask for gradients but don't compute errors w/ the H1 norm, you ask for curls, but don't compute errors w/ the H(curl) norm. That's why the warnings can be safely ignored in those cases, they just don't look very nice.

So what I meant was, we can implement the maps, and they'll be used at runtime, as you rightly said.
But unless the user asks for, e.g. H1/H(curl) errors for H(div) elements, they just won't affect the semantics of the program, it'll be dead code (as it currently is, it's just all zeros).