initial commit

third_party/eigen/doc/examples/class_CwiseUnaryOp_ptrfun.cpp

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+#include <Eigen/Core>
+#include <iostream>
+
+// define function to be applied coefficient-wise
+double ramp(double x) {
+  if (x > 0)
+    return x;
+  else
+    return 0;
+}
+
+int main(int, char**) {
+  Eigen::Matrix4d m1 = Eigen::Matrix4d::Random();
+  std::cout << m1 << std::endl << "becomes: " << std::endl << m1.unaryExpr(std::ptr_fun(ramp)) << std::endl;
+  return 0;
+}