| // This function is not intended to be a permanent function of libigl. Rather | |
| // it is a "drop-in" workaround for documented bug in Eigen: | |
| // http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1383 | |
| // | |
| // Replace: | |
| // | |
| // Eigen::VectorXi::LinSpaced(size,low,high); | |
| // | |
| // With: | |
| // | |
| // igl::LinSpaced<Eigen::VectorXi>(size,low,high); | |
| // | |
| // Specifcally, this version will _always_ return an empty vector if size==0, | |
| // regardless of the values for low and high. If size != 0, then this simply | |
| // returns the result of Eigen::Derived::LinSpaced. | |
| // | |
| // Until this bug is fixed, we should also avoid calls to the member function | |
| // `.setLinSpaced`. This means replacing: | |
| // | |
| // a.setLinSpaced(size,low,high); | |
| // | |
| // with | |
| // | |
| // a = igl::LinSpaced<decltype(a) >(size,low,high); | |
| // | |
| namespace igl | |
| { | |
| template <typename Derived> | |
| //inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType | |
| inline Derived LinSpaced( | |
| typename Derived::Index size, | |
| const typename Derived::Scalar & low, | |
| const typename Derived::Scalar & high); | |
| } | |
| // Implementation | |
| template <typename Derived> | |
| //inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType | |
| inline Derived | |
| igl::LinSpaced( | |
| typename Derived::Index size, | |
| const typename Derived::Scalar & low, | |
| const typename Derived::Scalar & high) | |
| { | |
| if(size == 0) | |
| { | |
| // Force empty vector with correct "RandomAccessLinSpacedReturnType" type. | |
| return Derived::LinSpaced(0,0,1); | |
| }else if(high < low) | |
| { | |
| return low-Derived::LinSpaced(size,low-low,low-high).array(); | |
| }else{ | |
| return Derived::LinSpaced(size,low,high); | |
| } | |
| } | |