as_column_vector_or_scalar of a kernel generator expression.
Converts input argument to a var_value<> with column vector or a scalar.
Converts std::vector to a column vector.
- Template Parameters
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- Parameters
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| a | input argument (must be a row or a column vector) |
- Returns
- as_column_vector_or_scalar of given expression
- 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
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- Parameters
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- Returns
- input converted to a column vector.
For column vector inputs this is an identity function.
- Template Parameters
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- Parameters
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- Returns
- Same vector.
Definition at line 325 of file as_column_vector_or_scalar.hpp.
