* update redux section

* fix output precision to 3 for the snippets

doc/snippets/compile_snippet.cpp.in

@@ -11,6 +11,7 @@ using namespace std;
 
 int main(int, char**)
 {
+  cout.precision(3);
   ${snippet_source_code}
   return 0;
 }

doc/snippets/tut_arithmetic_redux_minmax.cpp

@@ -0,0 +1,10 @@
+  Matrix3f m = Matrix3f::Random();
+  std::ptrdiff_t i, j;
+  float minOfM = m.minCoeff(&i,&j);
+  cout << "Here is the matrix m:\n" << m << endl;
+  cout << "Its minimum coefficient (" << minOfM << ") is at position (" << i << "," << j << ")\n\n";
+
+  RowVector4i v = RowVector4i::Random();
+  int maxOfV = v.maxCoeff(&i);
+  cout << "Here is the vector v: " << v << endl;
+  cout << "Its maximum coefficient (" << maxOfV << ") is at position " << i << endl;

doc/snippets/tut_arithmetic_transpose_aliasing.cpp

@@ -1,4 +1,5 @@
 Matrix2i a; a << 1, 2, 3, 4;
 cout << "Here is the matrix a:\n" << a << endl;
-a = a.transpose(); // fails
-cout << "and the aliasing effect:\n" << a << endl;
+
+a = a.transpose(); // !!! do NOT do this !!!
+cout << "and the result of the aliasing effect:\n" << a << endl;

doc/snippets/tut_arithmetic_transpose_inplace.cpp

@@ -1,4 +1,6 @@
 MatrixXf a(2,3); a << 1, 2, 3, 4, 5, 6;
 cout << "Here is the initial matrix a:\n" << a << endl;
+
+
 a.transposeInPlace();
 cout << "and after being transposed:\n" << a << endl;