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<head> <link rel="canonical" href="https://slepc.upv.es/documentation/current//Users/jroman/tmp/slepc-3.23.1/docs/manualpages/FN/index.html" />
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<title>Mathematical Function - FN</title>
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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<h2>Mathematical Function - FN</h2>
<p>
The FN package provides the functionality to represent a simple mathematical function such as an exponential, a polynomial or a rational function. This is used as a building block for defining the function associated to the nonlinear eigenproblem, as well as for specifying which function to use when computing the action of a matrix function on a vector.
</p>
<P>
<TABLE>
<TR><TD WIDTH=250 COLSPAN="3"><B>Beginner - Basic usage</B></TD></TR>
<TD WIDTH=250><A HREF="./FN.html">FN</A></TD>
<TD WIDTH=250><A HREF="./FNDestroy.html">FNDestroy</A></TD>
<TD WIDTH=250><A HREF="./FNType.html">FNType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNCreate.html">FNCreate</A></TD>
<TD WIDTH=250><A HREF="./FNSetFromOptions.html">FNSetFromOptions</A></TD>
<TD WIDTH=250><A HREF="./FNView.html">FNView</A></TD>
<TR>
<TR><TD WIDTH=250 COLSPAN="3"><B>Intermediate - Setting options for algorithms and data structures</B></TD></TR>
<TD WIDTH=250><A HREF="./FNCombineGetChildren.html">FNCombineGetChildren</A></TD>
<TD WIDTH=250><A HREF="./FNGetType.html">FNGetType</A></TD>
<TD WIDTH=250><A HREF="./FNRationalSetNumerator.html">FNRationalSetNumerator</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNCombineSetChildren.html">FNCombineSetChildren</A></TD>
<TD WIDTH=250><A HREF="./FNPhiGetIndex.html">FNPhiGetIndex</A></TD>
<TD WIDTH=250><A HREF="./FNSetMethod.html">FNSetMethod</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNEvaluateDerivative.html">FNEvaluateDerivative</A></TD>
<TD WIDTH=250><A HREF="./FNPhiSetIndex.html">FNPhiSetIndex</A></TD>
<TD WIDTH=250><A HREF="./FNSetScale.html">FNSetScale</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNEvaluateFunction.html">FNEvaluateFunction</A></TD>
<TD WIDTH=250><A HREF="./FNRationalGetDenominator.html">FNRationalGetDenominator</A></TD>
<TD WIDTH=250><A HREF="./FNSetType.html">FNSetType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNGetMethod.html">FNGetMethod</A></TD>
<TD WIDTH=250><A HREF="./FNRationalGetNumerator.html">FNRationalGetNumerator</A></TD>
<TD WIDTH=250><A HREF="./FNViewFromOptions.html">FNViewFromOptions</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNGetScale.html">FNGetScale</A></TD>
<TD WIDTH=250><A HREF="./FNRationalSetDenominator.html">FNRationalSetDenominator</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TR><TD WIDTH=250 COLSPAN="3"><B>Advanced - Setting more advanced options and customization</B></TD></TR>
<TD WIDTH=250><A HREF="./FNAppendOptionsPrefix.html">FNAppendOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./FNGetOptionsPrefix.html">FNGetOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./FNRegisterAll.html">FNRegisterAll</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNCombineType.html">FNCombineType</A></TD>
<TD WIDTH=250><A HREF="./FNGetParallel.html">FNGetParallel</A></TD>
<TD WIDTH=250><A HREF="./FNSetOptionsPrefix.html">FNSetOptionsPrefix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNEvaluateFunctionMat.html">FNEvaluateFunctionMat</A></TD>
<TD WIDTH=250><A HREF="./FNParallelType.html">FNParallelType</A></TD>
<TD WIDTH=250><A HREF="./FNSetParallel.html">FNSetParallel</A></TD>
<TR>
<TD WIDTH=250><A HREF="./FNEvaluateFunctionMatVec.html">FNEvaluateFunctionMatVec</A></TD>
<TD WIDTH=250><A HREF="./FNRegister.html">FNRegister</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TR><TD WIDTH=250 COLSPAN="3"><B>Developer - Interfaces intended primarily for library developers, not for typical applications programmers</B></TD></TR>
<TD WIDTH=250><A HREF="./FNDuplicate.html">FNDuplicate</A></TD>
<TD WIDTH=250><A HREF="./FNFinalizePackage.html">FNFinalizePackage</A></TD>
<TD WIDTH=250><A HREF="./FNInitializePackage.html">FNInitializePackage</A></TD>
<TR>
<TR><TD WIDTH=250 COLSPAN="3"><B>No deprecated routines</B></TD></TR>
</TABLE>
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