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}.
See Also#
FN: Mathematical Functions, FNRationalSetDenominator(), FNRationalGetNumerator()
Level#
intermediate
Location#
Examples#
src/nep/tutorials/ex27f.F90
src/nep/tutorials/ex42.c
src/mfn/tutorials/ex39.c
src/nep/tutorials/ex22f.F90
src/nep/tutorials/ex22.c
src/nep/tutorials/ex27.c
Implementations#
FNRationalSetNumerator_Rational() in src/sys/classes/fn/impls/rational/fnrational.c
Index of all FN routines Table of Contents for all manual pages Index of all manual pages