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19 lines
583 B
C++
19 lines
583 B
C++
#include <Eigen/SVD>
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#include <iostream>
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using namespace Eigen;
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using namespace std;
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float inv_cond(const Ref<const MatrixXf>& a) {
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const VectorXf sing_vals = a.jacobiSvd().singularValues();
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return sing_vals(sing_vals.size() - 1) / sing_vals(0);
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}
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int main() {
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Matrix4f m = Matrix4f::Random();
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cout << "matrix m:" << endl << m << endl << endl;
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cout << "inv_cond(m): " << inv_cond(m) << endl;
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cout << "inv_cond(m(1:3,1:3)): " << inv_cond(m.topLeftCorner(3, 3)) << endl;
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cout << "inv_cond(m+I): " << inv_cond(m + Matrix4f::Identity())
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<< endl;
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}
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