57 lines
1.7 KiB
C++
57 lines
1.7 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_HISTC_H
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#define IGL_HISTC_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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// Like matlab's histc. Count occurrences of values in X between consecutive
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// entries in E
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//
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// Inputs:
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// X m-long Vector of values
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// E n-long Monotonically increasing vector of edges
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// Outputs:
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// N n-long vector where N(k) reveals how many values in X fall between
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// E(k) <= X < E(k+1)
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// B m-long vector of bin ids so that B(j) = k if E(k) <= X(j) < E(k+1).
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// B(j) = -1 if X(j) is outside of E.
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//
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// O(n+m*log(n))
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template <typename DerivedX, typename DerivedE, typename DerivedN, typename DerivedB>
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IGL_INLINE void histc(
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const Eigen::MatrixBase<DerivedX > & X,
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const Eigen::MatrixBase<DerivedE > & E,
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Eigen::PlainObjectBase<DerivedN > & N,
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Eigen::PlainObjectBase<DerivedB > & B);
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// Truly O(m*log(n))
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template <typename DerivedX, typename DerivedE, typename DerivedB>
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IGL_INLINE void histc(
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const Eigen::MatrixBase<DerivedX > & X,
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const Eigen::MatrixBase<DerivedE > & E,
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Eigen::PlainObjectBase<DerivedB > & B);
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// Scalar search wrapper
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template <typename DerivedE>
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IGL_INLINE void histc(
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const typename DerivedE::Scalar & x,
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const Eigen::MatrixBase<DerivedE > & E,
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typename DerivedE::Index & b);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "histc.cpp"
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#endif
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#endif
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