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<div id="version" align=right><b>slepc-3.7.3 2016-09-29</b></div>
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<H1>STSetMatStructure</H1>
Sets an internal MatStructure attribute to indicate which is the relation of the sparsity pattern of all <A HREF="../ST/ST.html#ST">ST</A> matrices.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcst.h"
PetscErrorCode STSetMatStructure(ST st,MatStructure str)
</PRE>
Logically Collective on <A HREF="../ST/ST.html#ST">ST</A>
<P>
<H3><FONT COLOR="#883300">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>st </B></TD><TD> - the spectral transformation context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>str </B></TD><TD> - either SAME_NONZERO_PATTERN, DIFFERENT_NONZERO_PATTERN or
SUBSET_NONZERO_PATTERN
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Key</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0"><TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-st_matstructure <str> </B></TD><TD> - Indicates the structure flag, where <str> is one
of 'same' (matrices have the same nonzero pattern), 'different'
(different nonzero pattern) or 'subset' (pattern is a subset of the
first one).
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
By default, the sparsity patterns are assumed to be different. If the
patterns are equal or a subset then it is recommended to set this attribute
for efficiency reasons (in particular, for internal MatAXPY() operations).
<P>
This function has no effect in the case of standard eigenproblems.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../ST/STSetOperators.html#STSetOperators">STSetOperators</A>(), MatAXPY()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/sys/classes/st/interface/stset.c.html#STSetMatStructure">src/sys/classes/st/interface/stset.c</A>
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