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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="MatShellGetContext"><H1>MatShellGetContext</H1></A>
Returns the user-provided context associated with a shell matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatShellGetContext.html#MatShellGetContext">MatShellGetContext</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> mat,void *ctx)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mat </B></TD><TD>- the matrix, should have been created with <A HREF="../Mat/MatCreateShell.html#MatCreateShell">MatCreateShell</A>()
</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>ctx </B></TD><TD>- the user provided context
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Fortran Notes</FONT></H3>
To use this from Fortran you must write a Fortran interface definition for this
function that tells Fortran the Fortran derived data type that you are passing in as the ctx argument.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateShell.html#MatCreateShell">MatCreateShell</A>(), <A HREF="../Mat/MatShellSetOperation.html#MatShellSetOperation">MatShellSetOperation</A>(), <A HREF="../Mat/MatShellSetContext.html#MatShellSetContext">MatShellSetContext</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/shell/shell.c.html#MatShellGetContext">src/mat/impls/shell/shell.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/tutorials/ex6f.F90.html">src/mat/tutorials/ex6f.F90.html</A><BR>
<A HREF="../../../src/ts/tutorials/ex20opt_ic.c.html">src/ts/tutorials/ex20opt_ic.c.html</A><BR>
<A HREF="../../../src/ts/tutorials/ex50.c.html">src/ts/tutorials/ex50.c.html</A><BR>
<A HREF="../../../src/ts/tutorials/ex22f_mf.F90.html">src/ts/tutorials/ex22f_mf.F90.html</A><BR>
<A HREF="../../../src/tao/unconstrained/tutorials/eptorsion1.c.html">src/tao/unconstrained/tutorials/eptorsion1.c.html</A><BR>
<A HREF="../../../src/tao/bound/tutorials/plate2.c.html">src/tao/bound/tutorials/plate2.c.html</A><BR>
<A HREF="../../../src/tao/pde_constrained/tutorials/elliptic.c.html">src/tao/pde_constrained/tutorials/elliptic.c.html</A><BR>
<A HREF="../../../src/tao/pde_constrained/tutorials/parabolic.c.html">src/tao/pde_constrained/tutorials/parabolic.c.html</A><BR>
<A HREF="../../../src/tao/pde_constrained/tutorials/hyperbolic.c.html">src/tao/pde_constrained/tutorials/hyperbolic.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/shell/shell.c.html#MatShellGetContext_Shell">MatShellGetContext_Shell in src/mat/impls/shell/shell.c</A><BR>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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