petsc-3.14.5 2021-03-03
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# PetscDTGaussQuadrature

create Gauss-Legendre quadrature

### Synopsis

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

Not Collective

### Input Arguments

| npoints | - number of points
| a | - left end of interval (often-1)
| b | - right end of interval (often +1)

### Output Arguments

| x | - quadrature points
| w | - quadrature weights

### References

| 1. | - Golub and Welsch, Calculation of Quadrature Rules, Math. Comp. 23(106), 1969.

### See Also

PetscDTLegendreEval()

### Level

intermediate

### Location

src/dm/dt/interface/dt.c

### Examples

src/ksp/ksp/tutorials/ex74.c.html
Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages