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41 lines
1.3 KiB
C++
41 lines
1.3 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_COLUMNIZE_H
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#define IGL_COLUMNIZE_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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namespace igl
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{
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// "Columnize" a stack of block matrices. If A = [A1,A2,A3,...,Ak] with each A*
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// an m by n block then this produces the column vector whose entries are
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// B(j*m*k+i*k+b) = A(i,b*n+j);
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// or if A = [A1;A2;...;Ak] then
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// B(j*m*k+i*k+b) = A(i+b*m,j);
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//
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// Templates:
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// T should be a eigen matrix primitive type like int or double
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// Inputs:
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// A m*k by n (dim: 1) or m by n*k (dim: 2) eigen Matrix of type T values
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// k number of blocks
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// dim dimension in which blocks are stacked
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// Output
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// B m*n*k eigen vector of type T values,
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//
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// See also: transpose_blocks
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template <typename DerivedA, typename DerivedB>
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IGL_INLINE void columnize(
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const Eigen::PlainObjectBase<DerivedA> & A,
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const int k,
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const int dim,
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Eigen::PlainObjectBase<DerivedB> & B);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "columnize.cpp"
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#endif
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#endif
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