slepc-3.22.2 2024-12-02

FNRationalSetDenominator

Sets the parameters defining the denominator of the rational function.

Synopsis

#include "slepcfn.h" 
PetscErrorCode FNRationalSetDenominator(FN fn,PetscInt nq,PetscScalar qcoeff[])

Logically Collective

Input Parameters

	fn	- the math function context
	nq	- number of coefficients
	qcoeff	- coefficients (array of scalar values)

Notes

Let the rational function r(x) = p(x)/q(x), where p(x) and q(x) are polynomials. This function provides the coefficients of the denominator q(x). Hence, q(x) is of degree nq-1. If nq is zero, then the function is assumed to be polynomial, r(x) = p(x).

In polynomials, high order coefficients are stored in the first positions of the array, e.g. to represent x^2-3 use {1,0,-3}.

Level

intermediate

Location

src/sys/classes/fn/impls/rational/fnrational.c

Examples

src/nep/tutorials/ex42.c
src/nep/tutorials/nlevp/loaded_string.c

Index of all FN routines
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Index of all manual pages