20 lines
655 B
C++
20 lines
655 B
C++
#include <iostream>
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#include <Eigen/Dense>
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int main() {
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Eigen::Matrix2f A, b;
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Eigen::LLT<Eigen::Matrix2f> llt;
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A << 2, -1, -1, 3;
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b << 1, 2, 3, 1;
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std::cout << "Here is the matrix A:\n" << A << std::endl;
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std::cout << "Here is the right hand side b:\n" << b << std::endl;
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std::cout << "Computing LLT decomposition..." << std::endl;
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llt.compute(A);
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std::cout << "The solution is:\n" << llt.solve(b) << std::endl;
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A(1, 1)++;
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std::cout << "The matrix A is now:\n" << A << std::endl;
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std::cout << "Computing LLT decomposition..." << std::endl;
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llt.compute(A);
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std::cout << "The solution is now:\n" << llt.solve(b) << std::endl;
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}
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