PetscGaussLobattoLegendreElementLaplacianCreate#

computes the Laplacian for a single 1d GLL element

Synopsis#

#include "petscdt.h" 
PetscErrorCode PetscGaussLobattoLegendreElementLaplacianCreate(PetscInt n, PetscReal nodes[], PetscReal weights[], PetscReal ***AA)

Not Collective

Input Parameters#

n - the number of GLL nodes
nodes - the GLL nodes, of length n
weights - the GLL weights, of length n

Output Parameter#

AA - the stiffness element, of size n by n

Notes#

Destroy this with PetscGaussLobattoLegendreElementLaplacianDestroy()

You can access entries in this array with AA[i][j] but in memory it is stored in contiguous memory, row-oriented (the array is symmetric)

Level#

beginner

Location#

src/dm/dt/interface/dt.c

Examples#

src/ksp/ksp/tutorials/ex69.c
src/ksp/ksp/tutorials/ex68.c
src/ts/tutorials/ex50.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c

Index of all DT routines
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Index of all manual pages