From 010afe1619c9200b885f74d3c3937e000ec76b1d Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sat, 6 Feb 2016 22:49:18 +0100
Subject: Add exemples for reshaping/slicing with Map.

---
 doc/snippets/Tutorial_ReshapeMat2Mat.cpp |  6 ++++++
 doc/snippets/Tutorial_ReshapeMat2Vec.cpp | 11 +++++++++++
 doc/snippets/Tutorial_SlicingCol.cpp     | 11 +++++++++++
 doc/snippets/Tutorial_SlicingVec.cpp     |  4 ++++
 4 files changed, 32 insertions(+)
 create mode 100644 doc/snippets/Tutorial_ReshapeMat2Mat.cpp
 create mode 100644 doc/snippets/Tutorial_ReshapeMat2Vec.cpp
 create mode 100644 doc/snippets/Tutorial_SlicingCol.cpp
 create mode 100644 doc/snippets/Tutorial_SlicingVec.cpp

(limited to 'doc/snippets')

diff --git a/doc/snippets/Tutorial_ReshapeMat2Mat.cpp b/doc/snippets/Tutorial_ReshapeMat2Mat.cpp
new file mode 100644
index 000000000..f84d6e76d
--- /dev/null
+++ b/doc/snippets/Tutorial_ReshapeMat2Mat.cpp
@@ -0,0 +1,6 @@
+MatrixXf M1(2,6);    // Column-major storage
+M1 << 1, 2, 3,  4,  5,  6,
+      7, 8, 9, 10, 11, 12;
+
+Map<MatrixXf> M2(M1.data(), 6,2);
+cout << "M2:" << endl << M2 << endl;
\ No newline at end of file
diff --git a/doc/snippets/Tutorial_ReshapeMat2Vec.cpp b/doc/snippets/Tutorial_ReshapeMat2Vec.cpp
new file mode 100644
index 000000000..95bd4e0e6
--- /dev/null
+++ b/doc/snippets/Tutorial_ReshapeMat2Vec.cpp
@@ -0,0 +1,11 @@
+MatrixXf M1(3,3);    // Column-major storage
+M1 << 1, 2, 3,
+      4, 5, 6,
+      7, 8, 9;
+
+Map<RowVectorXf> v1(M1.data(), M1.size());
+cout << "v1:" << endl << v1 << endl;
+
+Matrix<float,Dynamic,Dynamic,RowMajor> M2(M1);
+Map<RowVectorXf> v2(M2.data(), M2.size());
+cout << "v2:" << endl << v2 << endl;
\ No newline at end of file
diff --git a/doc/snippets/Tutorial_SlicingCol.cpp b/doc/snippets/Tutorial_SlicingCol.cpp
new file mode 100644
index 000000000..f667ff689
--- /dev/null
+++ b/doc/snippets/Tutorial_SlicingCol.cpp
@@ -0,0 +1,11 @@
+MatrixXf M1 = MatrixXf::Random(3,8);
+cout << "Column major input:" << endl << M1 << "\n";
+Map<MatrixXf,0,OuterStride<> > M2(M1.data(), M1.rows(), (M1.cols()+2)/3, OuterStride<>(M1.outerStride()*3));
+cout << "1 column over 3:" << endl << M2 << "\n";
+
+typedef Matrix<float,Dynamic,Dynamic,RowMajor> RowMajorMatrixXf;
+RowMajorMatrixXf M3(M1);
+cout << "Row major input:" << endl << M3 << "\n";
+Map<RowMajorMatrixXf,0,Stride<Dynamic,3> > M4(M3.data(), M3.rows(), (M3.cols()+2)/3,
+                                              Stride<Dynamic,3>(M3.outerStride(),3));
+cout << "1 column over 3:" << endl << M4 << "\n";
\ No newline at end of file
diff --git a/doc/snippets/Tutorial_SlicingVec.cpp b/doc/snippets/Tutorial_SlicingVec.cpp
new file mode 100644
index 000000000..07e10bf69
--- /dev/null
+++ b/doc/snippets/Tutorial_SlicingVec.cpp
@@ -0,0 +1,4 @@
+RowVectorXf v = RowVectorXf::LinSpaced(20,0,19);
+cout << "Input:" << endl << v << endl;
+Map<RowVectorXf,0,InnerStride<2> > v2(v.data(), v.size()/2);
+cout << "Even:" << v2 << endl;
\ No newline at end of file
-- 
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