FNRationalSetNumerator#

Sets the parameters defining the numerator of the rational function.

Synopsis#

#include "slepcfn.h" 
PetscErrorCode FNRationalSetNumerator(FN fn,PetscInt np,PetscScalar pcoeff[])

Logically Collective

Input Parameters#

fn - the math function context
np - number of coefficients
pcoeff - coefficients (array of scalar values)

Notes#

Let the rational function be \(f(x) = p(x)/q(x)\), where \(p(x)\) and \(q(x)\) are polynomials. This function provides the coefficients of the numerator \(p(x)\). Hence, \(p(x)\) is of degree np-1. If np is zero, or this function is not called, then the numerator is assumed to be \(p(x)=1\).

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}.