as_array_or_scalar() [3/4]

template<typename T , typename = require_eigen_t<T>, require_not_eigen_array_t< T > * = nullptr>

auto stan::math::as_array_or_scalar ( T &&  v )

inline

Converts a matrix type to an array.

Converts an std::vector<std::vector> to an Eigen Array.

Converts a std::vector type to an array.

Template Parameters

T	Type of Eigen Matrix or expression

Parameters

v	Specified Eigen Matrix or expression.

Returns

Matrix converted to an array.

Note

The math library's reverse mode assumes that Eigen::Map types are allocated and owned elsewhere so we cannot just return back a map here else the reverse mode library may try to access into a dangling pointer. Instead we wrap the Eigen::Map in a Holder to trick the reverse mode library into not thinking this is a map. The .array().matrix() inside the holder is so that the holder thinks it is returning an expression.

Template Parameters

T	Type of scalar element.

Parameters

v	Specified vector.

Returns

Matrix converted to an array.

Template Parameters

T	A standard vector with inner container of a standard vector with an inner stan scalar.

Parameters

v	specified vector of vectorized

Returns

An Eigen Array with dynamic rows and columns.

Definition at line 56 of file as_array_or_scalar.hpp.