<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style id="owaParaStyle" type="text/css"><!--P {margin-top:0;margin-bottom:0;}--></style>
</head>
<body ocsi="0" fpstyle="1">
<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">
<div>
<div>Dear dune-fem community,<br>
<br>
</div>
I am working on the implementation of an a posteriori error estimator for a discontinuous Galerkin (DG) method on surfaces (world dimension = 3, grid dimension = 2). I have recently moved from the release versions of the dune modules (version 2.2.1) and the
dune-fem module (version 1.3.1) to the latest respository version of the dune and dune-fem modules.<br>
<br>
</div>
In my code I compute the hessian of a local function u_h of a DG discrete function i.e. u_h.hessian( x, hess ). With the repository version of the modules I get the following compile time error:<br>
<br>
Error: NotImplemented [<b>hessianEach</b>:[...]/dune-fem/
<div><wbr>dune/fem/space/<wbr>discontinuousgalerkin/<b>shapefun<wbr>ctionset.hh</b>:308]: Hessian
<span>not</span> <span>implemented</span> for this shape function set.<br>
<div><br>
</div>
<div>I was wondering why this method was not implemented and how I can go about implementing it. When using the release version of the dune modules, everything seems to be working fine and the
<b>hessianAll</b> method in dune/fem/space/basefunctions/<b>b<wbr>asefunctionsetinterface.hh</b> is called instead. Is this method correctly implemented for my setting? Thank you.<br>
<br>
</div>
<div>Best wishes,<br>
</div>
<div>Pravin</div>
</div>
</div>
</body>
</html>