DOC: Update documentation for 3.4.x

doc/TutorialSlicingIndexing.dox

@@ -14,7 +14,7 @@ In particular, it supports \b slicing that consists in taking a set of rows, col
 All the aforementioned operations are handled through the generic DenseBase::operator()(const RowIndices&, const ColIndices&) method.
 Each argument can be:
   - An integer indexing a single row or column, including symbolic indices.
-  - The symbol Eigen::all representing the whole set of respective rows or columns in increasing order.
+  - The symbol Eigen::placeholders::all representing the whole set of respective rows or columns in increasing order.
   - An ArithmeticSequence as constructed by the Eigen::seq, Eigen::seqN, or Eigen::placeholders::lastN functions.
   - Any 1D vector/array of integers including %Eigen's vector/array, expressions, std::vector, std::array, as well as plain C arrays: `int[N]`.
 

doc/examples/matrixfree_cg.cpp

@@ -66,7 +66,7 @@ namespace internal {
     {
       // This method should implement "dst += alpha * lhs * rhs" inplace,
       // however, for iterative solvers, alpha is always equal to 1, so let's not bother about it.
-      assert(alpha==Scalar(1) && "scaling is not implemented");
+      eigen_assert(alpha==Scalar(1) && "scaling is not implemented");
       EIGEN_ONLY_USED_FOR_DEBUG(alpha);
 
       // Here we could simply call dst.noalias() += lhs.my_matrix() * rhs,

doc/snippets/Tridiagonalization_decomposeInPlace.cpp

@@ -5,7 +5,8 @@ cout << "Here is a random symmetric 5x5 matrix:" << endl << A << endl << endl;
 VectorXd diag(5);
 VectorXd subdiag(4);
 VectorXd hcoeffs(4);  // Scratch space for householder reflector.
-internal::tridiagonalization_inplace(A, diag, subdiag, hcoeffs, true);
+VectorXd workspace(5);
+internal::tridiagonalization_inplace(A, diag, subdiag, hcoeffs, workspace, true);
 cout << "The orthogonal matrix Q is:" << endl << A << endl;
 cout << "The diagonal of the tridiagonal matrix T is:" << endl << diag << endl;
 cout << "The subdiagonal of the tridiagonal matrix T is:" << endl << subdiag << endl;

doc/snippets/compile_snippet.cpp.in

@@ -2,6 +2,7 @@ static bool eigen_did_assert = false;
 #define eigen_assert(X) if(!eigen_did_assert && !(X)){ std::cout << "### Assertion raised in " << __FILE__ << ":" << __LINE__ << ":\n" #X << "\n### The following would happen without assertions:\n"; eigen_did_assert = true;}
 
 #include <iostream>
+#include <cassert>
 #include <Eigen/Eigen>
 
 #ifndef M_PI