1c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// This file is part of Eigen, a lightweight C++ template library 2c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// for linear algebra. 3c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// 4c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr> 5c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com> 6c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// 7c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// This Source Code Form is subject to the terms of the Mozilla 8c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// Public License v. 2.0. If a copy of the MPL was not distributed 9c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 10c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 11c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath#ifndef EIGEN_BLOCK2_H 12c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath#define EIGEN_BLOCK2_H 13c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 14c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathnamespace Eigen { 15c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 16c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath/** \returns a dynamic-size expression of a corner of *this. 17c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 18c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight, 19c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \a Eigen::BottomLeft, \a Eigen::BottomRight. 20c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \param cRows the number of rows in the corner 21c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \param cCols the number of columns in the corner 22c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 23c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * Example: \include MatrixBase_corner_enum_int_int.cpp 24c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * Output: \verbinclude MatrixBase_corner_enum_int_int.out 25c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 26c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \note Even though the returned expression has dynamic size, in the case 27c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * when it is applied to a fixed-size matrix, it inherits a fixed maximal size, 28c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * which means that evaluating it does not cause a dynamic memory allocation. 29c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 30c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \sa class Block, block(Index,Index,Index,Index) 31c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath */ 32c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<typename Derived> 33c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathinline Block<Derived> DenseBase<Derived> 34c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ::corner(CornerType type, Index cRows, Index cCols) 35c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath{ 36c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath switch(type) 37c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath { 38c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath default: 39c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath eigen_assert(false && "Bad corner type."); 40c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopLeft: 41c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), 0, 0, cRows, cCols); 42c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopRight: 43c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols); 44c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomLeft: 45c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols); 46c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomRight: 47c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols); 48c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath } 49c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath} 50c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 51c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath/** This is the const version of corner(CornerType, Index, Index).*/ 52c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<typename Derived> 53c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathinline const Block<Derived> 54c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan KamathDenseBase<Derived>::corner(CornerType type, Index cRows, Index cCols) const 55c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath{ 56c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath switch(type) 57c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath { 58c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath default: 59c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath eigen_assert(false && "Bad corner type."); 60c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopLeft: 61c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), 0, 0, cRows, cCols); 62c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopRight: 63c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols); 64c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomLeft: 65c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols); 66c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomRight: 67c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols); 68c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath } 69c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath} 70c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 71c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath/** \returns a fixed-size expression of a corner of *this. 72c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 73c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight, 74c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \a Eigen::BottomLeft, \a Eigen::BottomRight. 75c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 76c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * The template parameters CRows and CCols arethe number of rows and columns in the corner. 77c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 78c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * Example: \include MatrixBase_template_int_int_corner_enum.cpp 79c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * Output: \verbinclude MatrixBase_template_int_int_corner_enum.out 80c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * 81c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath * \sa class Block, block(Index,Index,Index,Index) 82c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath */ 83c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<typename Derived> 84c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<int CRows, int CCols> 85c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathinline Block<Derived, CRows, CCols> 86c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan KamathDenseBase<Derived>::corner(CornerType type) 87c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath{ 88c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath switch(type) 89c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath { 90c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath default: 91c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath eigen_assert(false && "Bad corner type."); 92c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopLeft: 93c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), 0, 0); 94c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopRight: 95c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols); 96c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomLeft: 97c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0); 98c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomRight: 99c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols); 100c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath } 101c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath} 102c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 103c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath/** This is the const version of corner<int, int>(CornerType).*/ 104c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<typename Derived> 105c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathtemplate<int CRows, int CCols> 106c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamathinline const Block<Derived, CRows, CCols> 107c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan KamathDenseBase<Derived>::corner(CornerType type) const 108c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath{ 109c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath switch(type) 110c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath { 111c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath default: 112c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath eigen_assert(false && "Bad corner type."); 113c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopLeft: 114c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), 0, 0); 115c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case TopRight: 116c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols); 117c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomLeft: 118c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0); 119c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath case BottomRight: 120c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols); 121c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath } 122c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath} 123c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 124c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath} // end namespace Eigen 125c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 126c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath#endif // EIGEN_BLOCK2_H 127