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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>BVTensorGetFactors</H1>
Returns the two factors involved in the definition of the tensor basis vectors object, V = (I otimes U) S.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcbv.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../BV/BVTensorGetFactors.html#BVTensorGetFactors">BVTensorGetFactors</A>(<A HREF="../BV/BV.html#BV">BV</A> V,<A HREF="../BV/BV.html#BV">BV</A> *U,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> *S)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#883300">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>V </B></TD><TD> - the basis vectors context
</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>U </B></TD><TD> - the <A HREF="../BV/BV.html#BV">BV</A> factor
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>S </B></TD><TD> - the <A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> factor
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The returned factors are references (not copies) of the internal factors,
so modifying them will change the tensor <A HREF="../BV/BV.html#BV">BV</A> as well. Some operations of the
tensor <A HREF="../BV/BV.html#BV">BV</A> assume that U has orthonormal columns, so if the user modifies U
this restriction must be taken into account.
<P>
The returned factors must not be destroyed. <A HREF="../BV/BVTensorRestoreFactors.html#BVTensorRestoreFactors">BVTensorRestoreFactors</A>() must
be called when they are no longer needed.
<P>
Pass a NULL vector for any of the arguments that is not needed.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVTensorRestoreFactors.html#BVTensorRestoreFactors">BVTensorRestoreFactors</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/bv/impls/tensor/bvtensor.c.html#BVTensorGetFactors">src/sys/classes/bv/impls/tensor/bvtensor.c</A>
<BR><BR><A HREF="./index.html">Index of all BV routines</A>
<BR><A HREF="../../../docs/manual.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
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