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							14 lines
						
					
					
						
							371 B
						
					
					
				
			
		
		
		
			
			
			
				
					
				
				
					
				
			
		
		
	
	
							14 lines
						
					
					
						
							371 B
						
					
					
				
								#include <iostream>
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								#include <Eigen/Dense>
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								using namespace std;
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								using namespace Eigen;
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								int main()
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								{
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								   MatrixXd A = MatrixXd::Random(100,100);
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								   MatrixXd b = MatrixXd::Random(100,50);
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								   MatrixXd x = A.fullPivLu().solve(b);
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								   double relative_error = (A*x - b).norm() / b.norm(); // norm() is L2 norm
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								   cout << "The relative error is:\n" << relative_error << endl;
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								}
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