eigen: svd example, use pkg-config

kernel_module/user/eigen_svd.cpp

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+/* Adapted from: https://eigen.tuxfamily.org/dox/classEigen_1_1JacobiSVD.html */
+
+#include <iostream>
+using std::cout;
+using std::endl;
+
+#include <Eigen/Core>
+#include <Eigen/SVD>
+using Eigen::ComputeThinU;
+using Eigen::ComputeThinV;
+using Eigen::JacobiSVD;
+using Eigen::MatrixXf;
+using Eigen::Vector3f;
+
+int main() {
+	MatrixXf m = MatrixXf::Random(3,2);
+	JacobiSVD<MatrixXf> svd(m, ComputeThinU | ComputeThinV);
+	Vector3f rhs(1, 0, 0);
+	cout << "m = " << endl << m << endl << endl;
+	cout << "svd.singularValues() = " << endl << svd.singularValues() << endl << endl;
+	cout << "svd.MatrixU() = " << endl << svd.matrixU() << endl << endl;
+	cout << "svd.MatrixV() = " << endl << svd.matrixV() << endl << endl;
+	cout << "svd.solve() = " << endl << svd.solve(rhs) << endl << endl;
+}