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Refactor loop of filling of matrix A.

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- make now use of another variable 'j' for c, bc and alpha indexing
instead of always incrementing with =i= and the negation of =left_is_constant=
This commit is contained in:
Max Luebke 2022-02-03 15:10:03 +01:00
parent e3d10336a9
commit e2707858c1
1 changed files with 7 additions and 7 deletions
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12
src/BTCSDiffusion.cpp
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@ -133,21 +133,21 @@ void BTCSDiffusion::simulate1D(std::vector<double> &c, boundary_condition left,
// A_matrix.insert(0, 0) = 1; // A_matrix.insert(0, 0) = 1;
// A_matrix.insert(size + 1, size + 1) = 1; // A_matrix.insert(size + 1, size + 1) = 1;
for (int i = 1; i < size - right_is_constant; i++) { for (int i = 1, j = i + !(left_is_constant); i < size - right_is_constant;
if (bc[i + !(left_is_constant)].type == BTCSDiffusion::BC_CONSTANT) { i++, j++) {
if (bc[j].type == BTCSDiffusion::BC_CONSTANT) {
A_matrix.insert(i, i) = 1; A_matrix.insert(i, i) = 1;
b_vector[i] = bc[i + !(left_is_constant)].value; b_vector[i] = bc[j].value;
continue; continue;
} }
double sx = (alpha[j] * time_step) / (dx * dx);
double sx = (alpha[i + !(left_is_constant)] * time_step) / (dx * dx);
A_matrix.insert(i, i) = -1. - 2. * sx; A_matrix.insert(i, i) = -1. - 2. * sx;
A_matrix.insert(i, i - 1) = sx; A_matrix.insert(i, i - 1) = sx;
A_matrix.insert(i, i + 1) = sx; A_matrix.insert(i, i + 1) = sx;
b_vector[i] = -c[i + !(left_is_constant)]; b_vector[i] = -c[j];
} }
Eigen::SparseLU<Eigen::SparseMatrix<double>, Eigen::COLAMDOrdering<int>> Eigen::SparseLU<Eigen::SparseMatrix<double>, Eigen::COLAMDOrdering<int>>