64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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// 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_SLICE_INTO_H
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#define IGL_SLICE_INTO_H
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#include "igl_inline.h"
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#define EIGEN_YES_I_KNOW_SPARSE_MODULE_IS_NOT_STABLE_YET
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#include <Eigen/Dense>
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#include <Eigen/Sparse>
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namespace igl
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{
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// Act like the matlab Y(row_indices,col_indices) = X
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//
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// Inputs:
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// X xm by xn rhs matrix
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// R list of row indices
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// C list of column indices
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// Y ym by yn lhs matrix
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// Output:
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// Y ym by yn lhs matrix, same as input but Y(R,C) = X
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template <typename T>
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IGL_INLINE void slice_into(
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const Eigen::SparseMatrix<T>& X,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & C,
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Eigen::SparseMatrix<T>& Y);
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template <typename DerivedX, typename DerivedY>
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IGL_INLINE void slice_into(
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const Eigen::DenseBase<DerivedX> & X,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & C,
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Eigen::PlainObjectBase<DerivedY> & Y);
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// Wrapper to only slice in one direction
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//
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// Inputs:
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// dim dimension to slice in 1 or 2, dim=1 --> X(R,:), dim=2 --> X(:,R)
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//
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// Note: For now this is just a cheap wrapper.
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template <typename MatX, typename MatY>
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IGL_INLINE void slice_into(
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const MatX & X,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
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const int dim,
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MatY& Y);
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template <typename DerivedX, typename DerivedY>
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IGL_INLINE void slice_into(
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const Eigen::DenseBase<DerivedX> & X,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
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Eigen::PlainObjectBase<DerivedY> & Y);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "slice_into.cpp"
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#endif
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#endif
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