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71 lines
2.0 KiB
71 lines
2.0 KiB
1 year ago
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#ifndef IGL_LINSPACED_H
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#define IGL_LINSPACED_H
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#include <Eigen/Core>
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/// @file LinSpaced.h
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///
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/// This function is not intended to be a permanent function of libigl. Rather
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/// it is a "drop-in" workaround for documented bug in Eigen:
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/// http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1383
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///
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/// Replace:
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///
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/// Eigen::VectorXi::LinSpaced(size,low,high);
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///
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/// With:
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///
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/// igl::LinSpaced<Eigen::VectorXi>(size,low,high);
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///
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/// Specifcally, this version will _always_ return an empty vector if size==0,
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/// regardless of the values for low and high. If size != 0, then this simply
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/// returns the result of Eigen::Derived::LinSpaced.
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///
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/// Until this bug is fixed, we should also avoid calls to the member function
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/// `.setLinSpaced`. This means replacing:
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///
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/// a.setLinSpaced(size,low,high);
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///
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/// with
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///
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/// a = igl::LinSpaced<decltype(a) >(size,low,high);
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///
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namespace igl
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{
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/// Replacement for Eigen::DenseBase::LinSpaced
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/// @param[in] size number of elements
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/// @param[in] low first element
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/// @param[in] high last element
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/// @return vector of size elements linearly spaced between low and
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///
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/// \fileinfo
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template <typename Derived>
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//inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType
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inline Derived LinSpaced(
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typename Derived::Index size,
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const typename Derived::Scalar & low,
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const typename Derived::Scalar & high);
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}
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// Implementation
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template <typename Derived>
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//inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType
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inline Derived
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igl::LinSpaced(
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typename Derived::Index size,
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const typename Derived::Scalar & low,
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const typename Derived::Scalar & high)
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{
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if(size == 0)
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{
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// Force empty vector with correct "RandomAccessLinSpacedReturnType" type.
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return Derived::LinSpaced(0,0,1);
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}else if(high < low)
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{
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return low-Derived::LinSpaced(size,low-low,low-high).array();
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}else{
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return Derived::LinSpaced(size,low,high);
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}
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}
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#endif
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