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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<HEAD> <link rel="canonical" href="https://slepc.upv.es/documentation/current//Users/jroman/tmp/slepc-3.23.1/docs/manualpages/ST/STSHELL.html" />
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<TITLE>STSHELL</TITLE>
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<BODY BGCOLOR="FFFFFF">
<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
<div id="bugreport" align=right><a href="mailto:slepc-maint@upv.es?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: slepc-3.23.1 v3.23.1 /Users/jroman/tmp/slepc-3.23.1/docs/manualpages/ST/STSHELL.html "><small>Report Typos and Errors</small></a></div>
<H1>STSHELL</H1>
User-defined spectral transformation via callback functions for the application of the operator to a vector and (optionally) the backtransform operation.
<P>
<H3><FONT COLOR="#883300">Usage</FONT></H3>
<pre>
extern <A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*apply)(void*,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>);
</pre>
<pre>
extern <A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*applytrans)(void*,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>);
</pre>
<pre>
extern <A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*applyht)(void*,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A>);
</pre>
<pre>
extern <A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*backtr)(void*,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A>*,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A>*);
</pre>
<pre>
</pre>
<pre>
<A HREF="../ST/STCreate.html#STCreate">STCreate</A>(comm,&st);
</pre>
<pre>
<A HREF="../ST/STSetType.html#STSetType">STSetType</A>(st,<A HREF="../ST/STSHELL.html#STSHELL">STSHELL</A>);
</pre>
<pre>
<A HREF="../ST/STShellSetContext.html#STShellSetContext">STShellSetContext</A>(st,ctx);
</pre>
<pre>
<A HREF="../ST/STShellSetApply.html#STShellSetApply">STShellSetApply</A>(st,apply);
</pre>
<pre>
<A HREF="../ST/STShellSetApplyTranspose.html#STShellSetApplyTranspose">STShellSetApplyTranspose</A>(st,applytrans); (optional)
</pre>
<pre>
<A HREF="../ST/STShellSetApplyHermitianTranspose.html#STShellSetApplyHermitianTranspose">STShellSetApplyHermitianTranspose</A>(st,applyht); (optional, only in complex scalars)
</pre>
<pre>
<A HREF="../ST/STShellSetBackTransform.html#STShellSetBackTransform">STShellSetBackTransform</A>(st,backtr); (optional)
</pre>
<P>
<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#STSHELL">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/ex35.c.html">src/eps/tutorials/ex35.c</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>
<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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