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87 lines
2.5 KiB
C++
87 lines
2.5 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_SLICE_H
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#define IGL_SLICE_H
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#include "igl_inline.h"
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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 X(row_indices,col_indices) operator, where
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// row_indices, col_indices are non-negative integer indices.
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//
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// Inputs:
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// X m by n matrix
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// R list of row indices
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// C list of column indices
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// Output:
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// Y #R by #C matrix
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//
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// See also: slice_mask
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template <
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typename TX,
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typename TY>
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IGL_INLINE void slice(
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const Eigen::SparseMatrix<TX>& 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<TY>& 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 <
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typename MatX,
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typename DerivedR,
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typename MatY>
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IGL_INLINE void slice(
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const MatX& X,
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const Eigen::DenseBase<DerivedR> & R,
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const int dim,
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MatY& Y);
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template <
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typename DerivedX,
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typename DerivedR,
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typename DerivedC,
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typename DerivedY>
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IGL_INLINE void slice(
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const Eigen::DenseBase<DerivedX> & X,
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const Eigen::DenseBase<DerivedR> & R,
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const Eigen::DenseBase<DerivedC> & C,
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Eigen::PlainObjectBase<DerivedY> & Y);
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template <typename DerivedX, typename DerivedY>
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IGL_INLINE void slice(
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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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// VectorXi Y = slice(X,R);
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//
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// This templating is bad because the return type might not have the same
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// size as `DerivedX`. This will probably only work if DerivedX has Dynamic
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// as it's non-trivial sizes or if the number of rows in R happens to equal
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// the number of rows in `DerivedX`.
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template <typename DerivedX>
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IGL_INLINE DerivedX slice(
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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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template <typename DerivedX>
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IGL_INLINE DerivedX slice(
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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 int dim);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "slice.cpp"
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#endif
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#endif
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