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<H1>DSSetFN</H1>
Sets a number of functions to be used internally by <A HREF="../DS/DS.html#DS">DS</A>.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcds.h"
PetscErrorCode DSSetFN(DS ds,PetscInt n,FN f[])
</PRE>
Collective on <A HREF="../DS/DS.html#DS">DS</A> and <A HREF="../FN/FN.html#FN">FN</A>
<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>ds </B></TD><TD> - the direct solver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD> - number of functions
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD> - array of functions
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
In the basic usage, only one function is used, for instance to
evaluate a function of the projected matrix. In the context of nonlinear
eigensolvers, there are as many functions as terms in the split
nonlinear operator T(lambda) = sum_i A_i*f_i(lambda).
<P>
This function must be called before <A HREF="../DS/DSAllocate.html#DSAllocate">DSAllocate</A>(). Then <A HREF="../DS/DSAllocate.html#DSAllocate">DSAllocate</A>()
will allocate an extra matrix per each function.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../DS/DSGetFN.html#DSGetFN">DSGetFN</A>(), <A HREF="../DS/DSGetFN.html#DSGetFN">DSGetFN</A>(), <A HREF="../DS/DSAllocate.html#DSAllocate">DSAllocate</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/ds/interface/dsbasic.c.html#DSSetFN">src/ds/interface/dsbasic.c</A>
<BR><A HREF="./index.html">Index of all DS routines</A>
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