1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD>
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<link rel="stylesheet" href="/slepc/slepc.css" type="text/css">
<TITLE>STSetMatStructure</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<H1>STSetMatStructure</H1>
Sets an internal MatStructure attribute to indicate which is the relation of the sparsity pattern of the two matrices A and B constituting the generalized eigenvalue problem.
<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>
<DT><B>-st_matstructure <str> </B> - Indicates the structure flag, where <str> is one
of 'same' (A and B have the same nonzero pattern), 'different' (A
and B have different nonzero pattern) or 'subset' (B's nonzero
pattern is a subset of A's).
<br>
<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/st/interface/stset.c.html#STSetMatStructure">src/st/interface/stset.c</A>
<BR><A HREF="./index.html">Index of all ST 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>
</BODY></HTML>
|
