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88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef IGL_SORT_H
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#define IGL_SORT_H
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#include "igl_inline.h"
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#include <vector>
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#include <Eigen/Core>
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namespace igl
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{
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// Sort the elements of a matrix X along a given dimension like matlabs sort
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// function
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//
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// Templates:
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// DerivedX derived scalar type, e.g. MatrixXi or MatrixXd
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// DerivedIX derived integer type, e.g. MatrixXi
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// Inputs:
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// X m by n matrix whose entries are to be sorted
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// dim dimensional along which to sort:
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// 1 sort each column (matlab default)
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// 2 sort each row
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// ascending sort ascending (true, matlab default) or descending (false)
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// Outputs:
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// Y m by n matrix whose entries are sorted
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// IX m by n matrix of indices so that if dim = 1, then in matlab notation
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// for j = 1:n, Y(:,j) = X(I(:,j),j); end
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template <typename DerivedX, typename DerivedY, typename DerivedIX>
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IGL_INLINE void sort(
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const Eigen::DenseBase<DerivedX>& X,
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const int dim,
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const bool ascending,
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Eigen::PlainObjectBase<DerivedY>& Y,
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Eigen::PlainObjectBase<DerivedIX>& IX);
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template <typename DerivedX, typename DerivedY, typename DerivedIX>
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// Only better if size(X,dim) is small
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IGL_INLINE void sort_new(
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const Eigen::DenseBase<DerivedX>& X,
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const int dim,
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const bool ascending,
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Eigen::PlainObjectBase<DerivedY>& Y,
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Eigen::PlainObjectBase<DerivedIX>& IX);
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// Special case if size(X,dim) == 2
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template <typename DerivedX, typename DerivedY, typename DerivedIX>
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IGL_INLINE void sort2(
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const Eigen::DenseBase<DerivedX>& X,
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const int dim,
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const bool ascending,
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Eigen::PlainObjectBase<DerivedY>& Y,
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Eigen::PlainObjectBase<DerivedIX>& IX);
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// Special case if size(X,dim) == 3
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template <typename DerivedX, typename DerivedY, typename DerivedIX>
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IGL_INLINE void sort3(
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const Eigen::DenseBase<DerivedX>& X,
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const int dim,
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const bool ascending,
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Eigen::PlainObjectBase<DerivedY>& Y,
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Eigen::PlainObjectBase<DerivedIX>& IX);
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// Act like matlab's [Y,I] = SORT(X) for std library vectors
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// Templates:
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// T should be a class that implements the '<' comparator operator
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// Input:
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// unsorted unsorted vector
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// ascending sort ascending (true, matlab default) or descending (false)
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// Output:
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// sorted sorted vector, allowed to be same as unsorted
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// index_map an index map such that sorted[i] = unsorted[index_map[i]]
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template <class T>
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IGL_INLINE void sort(
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const std::vector<T> &unsorted,
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const bool ascending,
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std::vector<T> &sorted,
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std::vector<size_t> &index_map);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "sort.cpp"
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#endif
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#endif
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