initial commit

third_party/eigen/doc/examples/class_CwiseUnaryOp.cpp

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+#include <Eigen/Core>
+#include <iostream>
+
+// define a custom template unary functor
+template <typename Scalar>
+struct CwiseClampOp {
+  CwiseClampOp(const Scalar& inf, const Scalar& sup) : m_inf(inf), m_sup(sup) {}
+  const Scalar operator()(const Scalar& x) const { return x < m_inf ? m_inf : (x > m_sup ? m_sup : x); }
+  Scalar m_inf, m_sup;
+};
+
+int main(int, char**) {
+  Eigen::Matrix4d m1 = Eigen::Matrix4d::Random();
+  std::cout << m1 << std::endl
+            << "becomes: " << std::endl
+            << m1.unaryExpr(CwiseClampOp<double>(-0.5, 0.5)) << std::endl;
+  return 0;
+}