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<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
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<H1>STShellSetBackTransform</H1>
Sets the routine to be called after the eigensolution process has finished in order to transform back the computed eigenvalues.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcst.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../ST/STShellSetBackTransform.html#STShellSetBackTransform">STShellSetBackTransform</A>(<A HREF="../ST/ST.html#ST">ST</A> st,<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*backtr)(<A HREF="../ST/ST.html#ST">ST</A> st,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> n,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigr,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigi))
</PRE>
Logically 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>st </B></TD><TD> - the spectral transformation context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>backtr </B></TD><TD> - the application-provided backtransform routine
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Calling sequence of backtr</FONT></H3>
<pre>
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> backtr(<A HREF="../ST/ST.html#ST">ST</A> st,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> n,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigr,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigi)
</pre>
<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>n </B></TD><TD> - number of eigenvalues to be backtransformed
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigr </B></TD><TD> - pointer ot the real parts of the eigenvalues to transform back
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigi </B></TD><TD> - pointer ot the imaginary parts
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../ST/STShellSetApply.html#STShellSetApply">STShellSetApply</A>(), <A HREF="../ST/STShellSetApplyTranspose.html#STShellSetApplyTranspose">STShellSetApplyTranspose</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/st/impls/shell/shell.c.html#STShellSetBackTransform">src/sys/classes/st/impls/shell/shell.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/eps/tutorials/ex10.c.html">src/eps/tutorials/ex10.c</A><BR>
<A HREF="../../../src/eps/tutorials/ex10f.F90.html">src/eps/tutorials/ex10f.F90</A><BR>
<A HREF="../../../src/eps/tutorials/ex36.c.html">src/eps/tutorials/ex36.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all ST routines</A>
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