trace.hpp

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#ifndef STAN_MATH_OPENCL_PRIM_TRACE_HPP
#define STAN_MATH_OPENCL_PRIM_TRACE_HPP
#ifdef STAN_OPENCL
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/sum.hpp>
#include <stan/math/opencl/matrix_cl.hpp>
#include <stan/math/opencl/kernel_generator.hpp>
#include <stan/math/opencl/prim/sum.hpp>
 
namespace stan {
namespace math {
 
template <typename T,
          require_all_kernel_expressions_and_none_scalar_t<T>* = nullptr>
value_type_t<T> trace(const T& m) {
  return sum(diagonal(m));
}
 
}  // namespace math
}  // namespace stan
 
#endif
#endif