BTW: What happens if you do Mat x = Mat::Zero(10.0); ? Perhaps conversion from double or float work, because those types are "differentiable", as opposed to int.
On Wed, Jun 22, 2022 at 5:13 AM Oleg Shirokobrod <[email protected]> wrote: > Hi, > > In the file CwiseNullaryOp.h the functions DenseBase<Derived>::Zero call > function DenseBase<Derived>::Constant which uses Scalar(0) for > zero-initialization. It gives compilation error for this line > using Mat = Eigen::Matrix<std::complex<ceres::Jet<double, 3>>, -1, 1, 0, > -1, 1>; > Mat x = Mat::Zero(10); > Here ceres::Jet<double, 3> is autodif type in ceres-solver. The problem is > that it is not always possible to make conversion from int. From the other > side for non-class-type scalar values, Scalar() provides a temporary which > is zero-initialized. It is likely that for custom numerical class types > Scalar() provides zero-initialized temporary. This is the case for Jet. > When I replaced > > return Constant(size, Scalar(0)); > > with > > return Constant(size, Scalar()); > > in all Zero and setZero functions, code was compiled without errors. > > Best, > > Oleg > >
