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I have run into the following error using CppAD with eigen's Sparse
Cholesky solver
/home/bradbell/prefix/eigen/include/Eigen/src/SparseCore/TriangularSolver.h:72:23:
error: conversion from ‘int’ to non-scalar type
‘Eigen::internal::sparse_solve_triangular_selector<Eigen::Transpose<const Eigen::SparseMatrix<CppAD::AD<CppAD::AD<double>
> > >, Eigen::Matrix<CppAD::AD<CppAD::AD<double> >, -1, -1>, 6, 2,
1>::Scalar {aka CppAD::AD<CppAD::AD<double> >}’ requested
Scalar l_ii = 0;
Changing this line to
Scalar l_ii = Scalar(0);
solves the problem.