Implement mixed static/dynamic-size .block() (bug #579)

doc/LinearLeastSquares.dox

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+namespace Eigen {
+
+/** \eigenManualPage LinearLeastSquares Solving linear least squares problems
+
+lede
+
+\eigenAutoToc
+
+\section LinearLeastSquaresCopied Copied
+
+The best way to do least squares solving is with a SVD decomposition. Eigen provides one as the JacobiSVD class, and its solve()
+is doing least-squares solving.
+
+Here is an example:
+<table class="example">
+<tr><th>Example:</th><th>Output:</th></tr>
+<tr>
+  <td>\include TutorialLinAlgSVDSolve.cpp </td>
+  <td>\verbinclude TutorialLinAlgSVDSolve.out </td>
+</tr>
+</table>
+
+For more information, including faster but less reliable methods, read our page concentrating on \ref LinearLeastSquares "linear least squares problems".
+
+*/
+
+}

doc/snippets/MatrixBase_template_int_int_block_int_int_int_int.cpp

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+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is the block:" << endl << m.block<2, Dynamic>(1, 1, 2, 3) << endl;
+m.block<2, Dynamic>(1, 1, 2, 3).setZero();
+cout << "Now the matrix m is:" << endl << m << endl;

doc/snippets/MatrixBase_template_int_int_bottomLeftCorner_int_int.cpp

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+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is m.bottomLeftCorner<2,Dynamic>(2,2):" << endl;
+cout << m.bottomLeftCorner<2,Dynamic>(2,2) << endl;
+m.bottomLeftCorner<2,Dynamic>(2,2).setZero();
+cout << "Now the matrix m is:" << endl << m << endl;

doc/snippets/MatrixBase_template_int_int_bottomRightCorner_int_int.cpp

@@ -0,0 +1,6 @@
+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is m.bottomRightCorner<2,Dynamic>(2,2):" << endl;
+cout << m.bottomRightCorner<2,Dynamic>(2,2) << endl;
+m.bottomRightCorner<2,Dynamic>(2,2).setZero();
+cout << "Now the matrix m is:" << endl << m << endl;

doc/snippets/MatrixBase_template_int_int_topLeftCorner_int_int.cpp

@@ -0,0 +1,6 @@
+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is m.topLeftCorner<2,Dynamic>(2,2):" << endl;
+cout << m.topLeftCorner<2,Dynamic>(2,2) << endl;
+m.topLeftCorner<2,Dynamic>(2,2).setZero();
+cout << "Now the matrix m is:" << endl << m << endl;

doc/snippets/MatrixBase_template_int_int_topRightCorner_int_int.cpp

@@ -0,0 +1,6 @@
+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is m.topRightCorner<2,Dynamic>(2,2):" << endl;
+cout << m.topRightCorner<2,Dynamic>(2,2) << endl;
+m.topRightCorner<2,Dynamic>(2,2).setZero();
+cout << "Now the matrix m is:" << endl << m << endl;