petsc-3.14.5 2021-03-03
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Compute the wedge product of a j-form and a k-form, giving a (j+k) form


#include "petscdt.h" 
PetscErrorCode PetscDTAltVWedge(PetscInt N, PetscInt j, PetscInt k, const PetscReal *a, const PetscReal *b, PetscReal *awedgeb)

Input Arguments

N - the dimension of the vector space, N >= 0
j - the degree j of the j-form a, 0 <= j <= N
k - the degree k of the k-form b, 0 <= k <= N and 0 <= j+k <= N
a - a j-form, size [N choose j]
b - a k-form, size [N choose k]

Output Arguments

awedgeb - the (j+k)-form a wedge b, size [N choose (j+k)]: (a wedge b)(v_1,...,v_{j+k}) = \sum_{s} sign(s) a(v_{s_1},...,v_{s_j}) b(v_{s_{j+1}},...,v_{s_{j+k}}), where the sum is over permutations s such that s_1 < s_2 < ... < s_j and s_{j+1} < s_{j+2} < ... < s_{j+k}.

See Also

PetscDTAltV, PetscDTAltVWedgeMatrix(), PetscDTAltVPullback(), PetscDTAltVPullbackMatrix()




Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages