Difference between revisions of "cpp/numeric/valarray/atan2"
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Revision as of 22:21, 31 May 2013
| Defined in header <valarray>
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| template< class T > valarray<T> atan2( const valarray<T>& y, const valarray<T>& x ); |
(1) | |
| template< class T > valarray<T> atan2( const valarray<T>& y, const T& vx ); |
(2) | |
| template< class T > valarray<T> atan2( const T& vy, const valarray<T>& x ); |
(3) | |
Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.
1) Computes the inverse tangent of each pair of corresponding values from
y and x.The behavior is undefined if x.size() != y.size().
2) Computes the inverse tangent of
vx and each value in the numeric array y.3) Computes the inverse tangent of
vy and each value in the numeric array x.Contents |
Parameters
| x, y | - | numeric arrays to compute inverse tangent of |
| vy, vx | - | values to compute inverse tangent of |
Return value
A numeric array containing the results of computation of inverse tangent.
Notes
Unqualified function (atan2) is used to perform the computation. If such function is not available, std::atan2 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.
- For every function taking a const std::valarray<T>& except begin() and end()(since C++11), identical functions taking the replacement types shall be added;
- For every function taking two const std::valarray<T>& arguments, identical functions taking every combination of const std::valarray<T>& and replacement types shall be added.
- The return type does not add more than two levels of template nesting over the most deeply-nested argument type.
Example
| This section is incomplete Reason: no example |
See also
| (C++11)(C++11) |
arc tangent, using signs to determine quadrants (function) |
