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 r(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, 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#

FNRationalSetDenominator(), FNRationalGetNumerator()

Level#

intermediate

Location#

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

Examples#

src/mfn/tutorials/ex39.c
src/nep/tutorials/ex42.c
src/nep/tutorials/ex27f.F90
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

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