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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>DSGetMatAndColumn</H1>
Returns a sequential dense <A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> object containing the requested matrix and one of its columns as a <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcds.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DS/DSGetMatAndColumn.html#DSGetMatAndColumn">DSGetMatAndColumn</A>(<A HREF="../DS/DS.html#DS">DS</A> ds,<A HREF="../DS/DSMatType.html#DSMatType">DSMatType</A> m,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> col,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> *A,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> *v)
</PRE>
Not Collective
<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>ds </B></TD><TD> - the direct solver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>m </B></TD><TD> - the requested matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>col </B></TD><TD> - the requested column
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD> - <A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>v </B></TD><TD> - <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> object (the column)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
This calls <A HREF="../DS/DSGetMat.html#DSGetMat">DSGetMat</A>() and then it extracts the selected column.
The user must call <A HREF="../DS/DSRestoreMatAndColumn.html#DSRestoreMatAndColumn">DSRestoreMatAndColumn</A>() to recover the original state.
For matrices <A HREF="../DS/DSMatType.html#DSMatType">DS_MAT_T</A> and <A HREF="../DS/DSMatType.html#DSMatType">DS_MAT_D</A>, in complex scalars this function implies
copying from real values stored internally to scalar values in the <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../DS/DSRestoreMatAndColumn.html#DSRestoreMatAndColumn">DSRestoreMatAndColumn</A>(), <A HREF="../DS/DSGetMat.html#DSGetMat">DSGetMat</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/sys/classes/ds/interface/dsops.c.html#DSGetMatAndColumn">src/sys/classes/ds/interface/dsops.c</A>
<BR><BR><A HREF="./index.html">Index of all DS routines</A>
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