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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>RGIntervalSetEndpoints</H1>
Sets the parameters defining the interval region.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcrg.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../RG/RGIntervalSetEndpoints.html#RGIntervalSetEndpoints">RGIntervalSetEndpoints</A>(<A HREF="../RG/RG.html#RG">RG</A> rg,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> a,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> b,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> c,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> d)
</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>rg </B></TD><TD> - the region context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD> - left endpoint of the interval in the real axis
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>b </B></TD><TD> - right endpoint of the interval in the real axis
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>c </B></TD><TD> - bottom endpoint of the interval in the imaginary axis
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>d </B></TD><TD> - top endpoint of the interval in the imaginary axis
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-rg_interval_endpoints </B></TD><TD> - the four endpoints
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Note</FONT></H3>
The region is defined as [a,b]x[c,d]. Particular cases are an interval on
the real axis (c=d=0), similar for the imaginary axis (a=b=0), the whole
complex plane (a=-inf,b=inf,c=-inf,d=inf), and so on.
<P>
When PETSc is built with real scalars, the region must be symmetric with
respect to the real axis.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../RG/RGIntervalGetEndpoints.html#RGIntervalGetEndpoints">RGIntervalGetEndpoints</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/rg/impls/interval/rginterval.c.html#RGIntervalSetEndpoints">src/sys/classes/rg/impls/interval/rginterval.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/eps/tutorials/ex30.c.html">src/eps/tutorials/ex30.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex27.c.html">src/nep/tutorials/ex27.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex27f.F90.html">src/nep/tutorials/ex27f.F90</A><BR>
<A HREF="../../../src/nep/tutorials/ex42.c.html">src/nep/tutorials/ex42.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all RG routines</A>
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