std::atan2(std::valarray)

 

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Template:ddcl list begin <tr class="t-dsc-header">

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Defined in header <valarray>

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<td></td> <td></td> </tr> <tr class="t-dcl ">

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template< class T >
valarray<T> atan2( const valarray<T>& y, const valarray<T>& x );

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<td > (1) </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl ">

<td >

template< class T >
valarray<T> atan2( const valarray<T>& y, const T& vx );

</td>

<td > (2) </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl ">

<td >

template< class T >
valarray<T> atan2( const T& vy, const valarray<T>& x );

</td>

<td > (3) </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end

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.

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.

See also

Template:cpp/numeric/math/dcl list atan2