< cpp‎ | numeric‎ | valarray
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Defined in header <valarray>
template< class T >
valarray<T> tanh( const valarray<T>& va );

For each element in va computes hyperbolic tangent of the value of the element.


[edit] Parameters

va - value array to apply the operation to

[edit] Return value

Value array containing hyperbolic tangent of the values in va.

[edit] Notes

Unqualified function (tanh) is used to perform the computation. If such function is not available, std::tanh is used due to argument dependent lookup.

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

  • All const member functions of std::valarray are provided.
  • std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
  • All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
  • All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.
  • The return type does not add more than two levels of template nesting over the most deeply-nested argument type.

[edit] Possible implementation

template<class T>
valarray<T> tanh(const valarray<T>& va)
    valarray<T> other = va;
    for (T &i : other) {
        i = tanh(i);

[edit] Example

[edit] See also

hyperbolic tangent
(function) [edit]