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Fix uncommenting solving function.

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Now x is actually solved with the help of the equation system.
This commit is contained in:
Max Luebke 2022-01-25 09:55:54 +01:00
parent f6dbc3fb16
commit 6308cd52af
2 changed files with 12 additions and 9 deletions
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11
src/BTCSDiffusion.cpp
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@ -112,11 +112,13 @@ void BTCSDiffusion::simulate1D(std::vector<double> &c, boundary_condition left,
A_matrix.reserve(Eigen::VectorXi::Constant(size + bc_offset, 3)); A_matrix.reserve(Eigen::VectorXi::Constant(size + bc_offset, 3));
A_matrix.insert(0, 0) = 1; A_matrix.insert(0, 0) = 1;
b_vector[0] = (left_is_constant ? left.value : getBCFromFlux(left, c[0], alpha[0])); b_vector[0] =
(left_is_constant ? left.value : getBCFromFlux(left, c[0], alpha[0]));
A_matrix.insert((size + bc_offset) - 1, (size + bc_offset) - 1) = 1; A_matrix.insert((size + bc_offset) - 1, (size + bc_offset) - 1) = 1;
b_vector[size + bc_offset - 1] = b_vector[size + bc_offset - 1] =
(right_is_constant ? right.value : getBCFromFlux(right, c[size - 1], alpha[size - 1])); (right_is_constant ? right.value
: getBCFromFlux(right, c[size - 1], alpha[size - 1]));
// 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;
@ -141,7 +143,7 @@ std::cout << b_vector << "\n" << A_matrix << std::endl;
std::cout << solver.lastErrorMessage() << std::endl; std::cout << solver.lastErrorMessage() << std::endl;
// x_vector = solver.solve(b_vector); x_vector = solver.solve(b_vector);
std::cout << std::setprecision(10) << x_vector << std::endl << std::endl; std::cout << std::setprecision(10) << x_vector << std::endl << std::endl;
@ -165,7 +167,8 @@ void BTCSDiffusion::simulate(std::vector<double> &c,
} }
} }
inline double BTCSDiffusion::getBCFromFlux(boundary_condition bc, double neighbor_c, inline double BTCSDiffusion::getBCFromFlux(boundary_condition bc,
double neighbor_c,
double neighbor_alpha) { double neighbor_alpha) {
double val; double val;

2
src/main.cpp
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@ -33,7 +33,7 @@ int main(int argc, char *argv[]) {
// loop 100 times // loop 100 times
// output is currently generated by the method itself // output is currently generated by the method itself
for (int i = 0; i < 1; i++) { for (int i = 0; i < 100; i++) {
diffu.simulate(field, alpha); diffu.simulate(field, alpha);
} }