Initial commit

Eigen3/doc/special_examples/random_cpp11.cpp

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+#include <Eigen/Core>
+#include <iostream>
+#include <random>
+
+using namespace Eigen;
+
+int main() {
+  std::default_random_engine generator;
+  std::poisson_distribution<int> distribution(4.1);
+  auto poisson = [&] () {return distribution(generator);};
+
+  RowVectorXi v = RowVectorXi::NullaryExpr(10, poisson );
+  std::cout << v << "\n";
+}