ground/gcs/src/libs/eigen/test/array_reverse.cpp

   1 // This file is part of Eigen, a lightweight C++ template library
   2 // for linear algebra.
   3 //
   4 // Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
   5 // Copyright (C) 2009 Ricard Marxer <email@ricardmarxer.com>
   6 //
   7 // This Source Code Form is subject to the terms of the Mozilla
   8 // Public License v. 2.0. If a copy of the MPL was not distributed
   9 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
  10
  11 #include "main.h"
  12 #include <iostream>
  13
  14 using namespace std;
  15
  16 template<typename MatrixType> void reverse(const MatrixType& m)
  17 {
  18   typedef typename MatrixType::Index Index;
  19   typedef typename MatrixType::Scalar Scalar;
  20   typedef Matrix<Scalar, MatrixType::RowsAtCompileTime, 1> VectorType;
  21
  22   Index rows = m.rows();
  23   Index cols = m.cols();
  24
  25   // this test relies a lot on Random.h, and there's not much more that we can do
  26   // to test it, hence I consider that we will have tested Random.h
  27   MatrixType m1 = MatrixType::Random(rows, cols);
  28   VectorType v1 = VectorType::Random(rows);
  29
  30   MatrixType m1_r = m1.reverse();
  31   // Verify that MatrixBase::reverse() works
  32   for ( int i = 0; i < rows; i++ ) {
  33     for ( int j = 0; j < cols; j++ ) {
  34       VERIFY_IS_APPROX(m1_r(i, j), m1(rows - 1 - i, cols - 1 - j));
  35     }
  36   }
  37
  38   Reverse<MatrixType> m1_rd(m1);
  39   // Verify that a Reverse default (in both directions) of an expression works
  40   for ( int i = 0; i < rows; i++ ) {
  41     for ( int j = 0; j < cols; j++ ) {
  42       VERIFY_IS_APPROX(m1_rd(i, j), m1(rows - 1 - i, cols - 1 - j));
  43     }
  44   }
  45
  46   Reverse<MatrixType, BothDirections> m1_rb(m1);
  47   // Verify that a Reverse in both directions of an expression works
  48   for ( int i = 0; i < rows; i++ ) {
  49     for ( int j = 0; j < cols; j++ ) {
  50       VERIFY_IS_APPROX(m1_rb(i, j), m1(rows - 1 - i, cols - 1 - j));
  51     }
  52   }
  53
  54   Reverse<MatrixType, Vertical> m1_rv(m1);
  55   // Verify that a Reverse in the vertical directions of an expression works
  56   for ( int i = 0; i < rows; i++ ) {
  57     for ( int j = 0; j < cols; j++ ) {
  58       VERIFY_IS_APPROX(m1_rv(i, j), m1(rows - 1 - i, j));
  59     }
  60   }
  61
  62   Reverse<MatrixType, Horizontal> m1_rh(m1);
  63   // Verify that a Reverse in the horizontal directions of an expression works
  64   for ( int i = 0; i < rows; i++ ) {
  65     for ( int j = 0; j < cols; j++ ) {
  66       VERIFY_IS_APPROX(m1_rh(i, j), m1(i, cols - 1 - j));
  67     }
  68   }
  69
  70   VectorType v1_r = v1.reverse();
  71   // Verify that a VectorType::reverse() of an expression works
  72   for ( int i = 0; i < rows; i++ ) {
  73     VERIFY_IS_APPROX(v1_r(i), v1(rows - 1 - i));
  74   }
  75
  76   MatrixType m1_cr = m1.colwise().reverse();
  77   // Verify that PartialRedux::reverse() works (for colwise())
  78   for ( int i = 0; i < rows; i++ ) {
  79     for ( int j = 0; j < cols; j++ ) {
  80       VERIFY_IS_APPROX(m1_cr(i, j), m1(rows - 1 - i, j));
  81     }
  82   }
  83
  84   MatrixType m1_rr = m1.rowwise().reverse();
  85   // Verify that PartialRedux::reverse() works (for rowwise())
  86   for ( int i = 0; i < rows; i++ ) {
  87     for ( int j = 0; j < cols; j++ ) {
  88       VERIFY_IS_APPROX(m1_rr(i, j), m1(i, cols - 1 - j));
  89     }
  90   }
  91
  92   Scalar x = internal::random<Scalar>();
  93
  94   Index r = internal::random<Index>(0, rows-1),
  95         c = internal::random<Index>(0, cols-1);
  96
  97   m1.reverse()(r, c) = x;
  98   VERIFY_IS_APPROX(x, m1(rows - 1 - r, cols - 1 - c));
  99
 100   /*
 101   m1.colwise().reverse()(r, c) = x;
 102   VERIFY_IS_APPROX(x, m1(rows - 1 - r, c));
 103
 104   m1.rowwise().reverse()(r, c) = x;
 105   VERIFY_IS_APPROX(x, m1(r, cols - 1 - c));
 106   */
 107 }
 108
 109 void test_array_reverse()
 110 {
 111   for(int i = 0; i < g_repeat; i++) {
 112     CALL_SUBTEST_1( reverse(Matrix<float, 1, 1>()) );
 113     CALL_SUBTEST_2( reverse(Matrix2f()) );
 114     CALL_SUBTEST_3( reverse(Matrix4f()) );
 115     CALL_SUBTEST_4( reverse(Matrix4d()) );
 116     CALL_SUBTEST_5( reverse(MatrixXcf(3, 3)) );
 117     CALL_SUBTEST_6( reverse(MatrixXi(6, 3)) );
 118     CALL_SUBTEST_7( reverse(MatrixXcd(20, 20)) );
 119     CALL_SUBTEST_8( reverse(Matrix<float, 100, 100>()) );
 120     CALL_SUBTEST_9( reverse(Matrix<float,Dynamic,Dynamic,RowMajor>(6,3)) );
 121   }
 122 #ifdef EIGEN_TEST_PART_3
 123   Vector4f x; x << 1, 2, 3, 4;
 124   Vector4f y; y << 4, 3, 2, 1;
 125   VERIFY(x.reverse()[1] == 3);
 126   VERIFY(x.reverse() == y);
 127 #endif
 128 }