From 35f7829af10c61e33dd2e2a7a015058e11a11ea0 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 25 Mar 2017 14:17:07 +0100
Subject: update

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 eigen/doc/TutorialReshapeSlicing.dox | 65 ++++++++++++++++++++++++++++++++++++
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 create mode 100644 eigen/doc/TutorialReshapeSlicing.dox

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diff --git a/eigen/doc/TutorialReshapeSlicing.dox b/eigen/doc/TutorialReshapeSlicing.dox
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+namespace Eigen {
+
+/** \eigenManualPage TutorialReshapeSlicing Reshape and Slicing
+
+%Eigen does not expose convenient methods to take slices or to reshape a matrix yet.
+Nonetheless, such features can easily be emulated using the Map class.
+
+\eigenAutoToc
+
+\section TutorialReshape Reshape
+
+A reshape operation consists in modifying the sizes of a matrix while keeping the same coefficients.
+Instead of modifying the input matrix itself, which is not possible for compile-time sizes, the approach consist in creating a different \em view on the storage using class Map.
+Here is a typical example creating a 1D linear view of a matrix:
+
+<table class="example">
+<tr><th>Example:</th><th>Output:</th></tr>
+<tr><td>
+\include Tutorial_ReshapeMat2Vec.cpp
+</td>
+<td>
+\verbinclude Tutorial_ReshapeMat2Vec.out
+</td></tr></table>
+
+Remark how the storage order of the input matrix modifies the order of the coefficients in the linear view.
+Here is another example reshaping a 2x6 matrix to a 6x2 one:
+<table class="example">
+<tr><th>Example:</th><th>Output:</th></tr>
+<tr><td>
+\include Tutorial_ReshapeMat2Mat.cpp
+</td>
+<td>
+\verbinclude Tutorial_ReshapeMat2Mat.out
+</td></tr></table>
+
+
+
+\section TutorialSlicing Slicing
+
+Slicing consists in taking a set of rows, columns, or elements, uniformly spaced within a matrix.
+Again, the class Map allows to easily mimic this feature.
+
+For instance, one can skip every P elements in a vector:
+<table class="example">
+<tr><th>Example:</th><th>Output:</th></tr>
+<tr><td>
+\include Tutorial_SlicingVec.cpp
+</td>
+<td>
+\verbinclude Tutorial_SlicingVec.out
+</td></tr></table>
+
+One can olso take one column over three using an adequate outer-stride or inner-stride depending on the actual storage order:
+<table class="example">
+<tr><th>Example:</th><th>Output:</th></tr>
+<tr><td>
+\include Tutorial_SlicingCol.cpp
+</td>
+<td>
+\verbinclude Tutorial_SlicingCol.out
+</td></tr></table>
+
+*/
+
+}
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