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}.