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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="PetscDSGetExactSolution"><H1>PetscDSGetExactSolution</H1></A>
Get the pointwise exact solution function for a given test field
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscds.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DT/PetscDSGetExactSolution.html#PetscDSGetExactSolution">PetscDSGetExactSolution</A>(<A HREF="../DM/PetscDS.html#PetscDS">PetscDS</A> prob, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> f, <A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (**sol)(<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> dim, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> t, const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> x[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> Nc, <A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> u[], void *ctx), void **ctx)
</PRE>
Not collective
<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>prob </B></TD><TD>- The <A HREF="../DM/PetscDS.html#PetscDS">PetscDS</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD>- The test field number
</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>exactSol </B></TD><TD>- exact solution for the test field
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>exactCtx </B></TD><TD>- exact solution context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Note: The calling sequence for the solution functions is given by</FONT></H3>
<P>
<pre>
sol(<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> dim, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> t, const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> x[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> Nc, <A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> u[], void *ctx)
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dim </B></TD><TD>- the spatial dimension
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>t </B></TD><TD>- current time
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- coordinates of the current point
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Nc </B></TD><TD>- the number of field components
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>u </B></TD><TD>- the solution field evaluated at the current point
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- a user context
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DT/PetscDSSetExactSolution.html#PetscDSSetExactSolution">PetscDSSetExactSolution</A>(), <A HREF="../DT/PetscDSGetExactSolutionTimeDerivative.html#PetscDSGetExactSolutionTimeDerivative">PetscDSGetExactSolutionTimeDerivative</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/dt/interface/dtds.c.html#PetscDSGetExactSolution">src/dm/dt/interface/dtds.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/tao/tutorials/ex1.c.html">src/tao/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/tao/tutorials/ex2.c.html">src/tao/tutorials/ex2.c.html</A><BR>
<BR><A HREF="./index.html">Index of all DT routines</A>
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