66 lines
2.3 KiB
C
66 lines
2.3 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_COLON_H
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#define IGL_COLON_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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namespace igl
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{
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// Note:
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// This should be potentially replaced with eigen's LinSpaced() function
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//
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// If step = 1, it's about 5 times faster to use:
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// X = Eigen::VectorXi::LinSpaced(n,0,n-1);
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// than
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// X = igl::colon<int>(0,n-1);
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//
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// Colon operator like matlab's colon operator. Enumerats values between low
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// and hi with step step.
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// Templates:
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// L should be a eigen matrix primitive type like int or double
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// S should be a eigen matrix primitive type like int or double
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// H should be a eigen matrix primitive type like int or double
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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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// low starting value if step is valid then this is *always* the first
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// element of I
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// step step difference between sequential elements returned in I,
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// remember this will be cast to template T at compile time. If low<hi
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// then step must be positive. If low>hi then step must be negative.
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// Otherwise I will be set to empty.
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// hi ending value, if (hi-low)%step is zero then this will be the last
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// element in I. If step is positive there will be no elements greater
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// than hi, vice versa if hi<low
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// Output:
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// I list of values from low to hi with step size step
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template <typename L,typename S,typename H,typename T>
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IGL_INLINE void colon(
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const L low,
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const S step,
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const H hi,
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Eigen::Matrix<T,Eigen::Dynamic,1> & I);
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// Same as above but step == (T)1
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template <typename L,typename H,typename T>
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IGL_INLINE void colon(
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const L low,
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const H hi,
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Eigen::Matrix<T,Eigen::Dynamic,1> & I);
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// Return output rather than set in reference
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template <typename T,typename L,typename H>
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IGL_INLINE Eigen::Matrix<T,Eigen::Dynamic,1> colon(
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const L low,
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const H hi);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "colon.cpp"
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#endif
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#endif
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