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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="DMComputeL2GradientDiff"><H1>DMComputeL2GradientDiff</H1></A>
This function computes the L_2 difference between the gradient of a function u and an FEM interpolant solution grad u_h.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DM/DMComputeL2GradientDiff.html#DMComputeL2GradientDiff">DMComputeL2GradientDiff</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> time, <A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (**funcs)(<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A>, const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> [], const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A>[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, <A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *, void *), void **ctxs, <A HREF="../Vec/Vec.html#Vec">Vec</A> X, const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> n[], <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> *diff)
</PRE>
Collective on dm
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm </B></TD><TD>- The <A HREF="../DM/DM.html#DM">DM</A>
, time - The time
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>funcs </B></TD><TD>- The gradient functions to evaluate for each field component
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctxs </B></TD><TD>- Optional array of contexts to pass to each function, or NULL.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>X </B></TD><TD>- The coefficient vector u_h, a global vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- The vector to project along
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>diff </B></TD><TD>- The diff ||(grad u - grad u_h) . n||_2
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMProjectFunction.html#DMProjectFunction">DMProjectFunction</A>(), <A HREF="../DM/DMComputeL2Diff.html#DMComputeL2Diff">DMComputeL2Diff</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/interface/dm.c.html#DMComputeL2GradientDiff">src/dm/interface/dm.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/plex/plexfem.c.html#DMComputeL2GradientDiff_Plex(DM dm, PetscReal time, PetscErrorCode (**funcs)">DMComputeL2GradientDiff_Plex(DM dm, PetscReal time, PetscErrorCode (**funcs) in src/dm/impls/plex/plexfem.c</A><BR>
<BR><A HREF="./index.html">Index of all DM routines</A>
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