head() [1/3]

template<typename T_x , typename = require_nonscalar_prim_or_rev_kernel_expression_t<T_x>>

auto stan::math::head ( T_x &&  x, size_t  n  )

inline

Return the specified number of elements as a vector or row vector (same as input) from the front of the specified vector or row vector.

Template Parameters

T_x	type of input kernel generator expression.

Parameters

x	input kernel generator expression.
n	Size of return.

Returns

The first n elements of v.

Exceptions

std::out_of_range

if n is out of range.

Definition at line 24 of file head.hpp.