quad_form_sym() [5/5]

template<typename EigMat1 , typename EigMat2 , require_all_eigen_t< EigMat1, EigMat2 > * = nullptr, require_any_vt_var< EigMat1, EigMat2 > * = nullptr>

auto stan::math::quad_form_sym ( const EigMat1 &  A, const EigMat2 &  B  )

inline

Return the quadratic form \( B^T A B \) of a symmetric matrix.

Symmetry of the resulting matrix is guaranteed.

Template Parameters

EigMat1	type of the first (symmetric) matrix
EigMat2	type of the second matrix

Parameters

A	symmetric matrix
B	second matrix

Returns

The quadratic form, which is a symmetric matrix of size Cb. If B is a column vector returns a scalar.

Exceptions

std::invalid_argument

if A is not symmetric, or if A cannot be multiplied by B

Definition at line 34 of file quad_form_sym.hpp.