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<A NAME="TSAlphaSetAdapt"><H1>TSAlphaSetAdapt</H1></A>
sets the time step adaptativity and acceptance test routine
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscts.h"
PetscErrorCode TSAlphaSetAdapt(TS ts,TSAlphaAdaptFunction adapt,void *ctx)
</PRE>
This function allows to accept/reject a step and select the
next time step to use.
<P>
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>ts </B></TD><TD>- timestepping context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>adapt </B></TD><TD>- user-defined adapt routine
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- [optional] user-defined context for private data for the
adapt routine (may be <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence of adapt</FONT></H3>
<pre>
adapt (<A HREF="../TS/TS.html#TS">TS</A> ts,<A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> t,<A HREF="../Vec/Vec.html#Vec">Vec</A> X,<A HREF="../Vec/Vec.html#Vec">Vec</A> Xdot,
</pre>
<pre>
<A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> *next_dt,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *accepted,void *ctx);
</pre>
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ts/impls/implicit/alpha/alpha.c.html#TSAlphaSetAdapt">src/ts/impls/implicit/alpha/alpha.c</A>
<BR><A HREF="./index.html">Index of all TS routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ts/examples/tutorials/ex18.c.html">src/ts/examples/tutorials/ex18.c.html</A><BR>
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