PetscDTGaussQuadrature

create Gauss-Legendre quadrature

Synopsis

#include "petscdt.h" 
PetscErrorCode PetscDTGaussQuadrature(PetscInt npoints, PetscReal a, PetscReal b, PetscReal *x, PetscReal *w)

Not Collective

Input Parameters

• npoints - number of points

• a - left end of interval (often-1)

• b - right end of interval (often +1)

Output Parameters

• x - quadrature points

• w - quadrature weights

Note

See [GW69]

References

[GW69]

Gene H Golub and John H Welsch. Calculation of Gauss quadrature rules. Mathematics of computation, 23(106):221–230, 1969.

See Also

PetscDTLegendreEval(), PetscDTGaussJacobiQuadrature()

Level

intermediate

Location

src/dm/dt/interface/dt.c

Examples

src/ksp/ksp/tutorials/ex74.c
src/snes/tutorials/ex31.c

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Index of all DT routines
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Index of all manual pages