Description

BDRNEU Compute Neumann (flux) boundary condition vector.

[ F, T ] = BDRNEU( PROB, I_CUB ) Computes a load vector F with Neumann/flux boundary condition contributions for the boundary expressions defined in PROB.BDR.N.

Boundary coefficients are specified as (1 x n_dvar) cell arrays in the BDR.N field where the entry for each boundary is a (n_bc_groups x n_bdr) nested cell array containing the coefficients (n_bc_groups is 1, except for special element types such as Hermite basis functions). The coefficient entries can be specified either as constant numeric values, or string expressions which will be evaluated during the simulation.

Input       Value/(Size)           Description
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prob        struct                 Problem data struct
i_cub       scalar {2}             Numerical integration rule
                                                                                  .
Output      Value/(Size)           Description
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f           (neq,1)                Neumann boundary condition load vector
t           scalar                 Time spent in function