| Common mathematical functions | |||||||||||||||||||||||||||||||
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Numeric array (valarray) | |||||||||||||||||||||||||||||||
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| Generic numeric operations | |||||||||||||||||||||||||||||||
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| C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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Defined in header <valarray> | ||
template<class T> valarray<T> acos(const valarray<T>& va); | ||
For each element inva computes arc cosine of the value of the element.
Contents |
| va | - | value array to apply the operation to |
Value array containing arc cosines of the values inva.
Unqualified function (acos) is used to perform the computation. If such function is not available,std::acos is used due toargument-dependent lookup.
The function can be implemented with the return type different fromstd::valarray. In this case, the replacement type has the following properties:
template<class T>valarray<T> acos(const valarray<T>& va){ valarray<T> other= va;for(T& i: other) i= acos(i); return other;// proxy object may be returned} |
#include <cmath>#include <iostream>#include <numbers>#include <valarray> int main(){// take common x-values from unit circleconstdouble s32=std::sqrt(3.0)/2.0;constdouble s22=std::sqrt(2.0)/2.0;std::valarray<double> v1={-1.0,-s32,-s22,-0.5,0.0,0.5, s22, s32,1.0};std::valarray<double> v2=std::acos(v1)*180.0/std::numbers::pi; for(double n: v2)std::cout<< n<<"° ";std::cout<<'\n';}
Output:
180° 150° 135° 120° 90° 60° 45° 30° 0°
| applies the functionstd::asin to each element of valarray (function template)[edit] | |
| applies the functionstd::atan to each element of valarray (function template)[edit] | |
| applies the functionstd::atan2 to a valarray and a value (function template)[edit] | |
| applies the functionstd::cos to each element of valarray (function template)[edit] | |
(C++11)(C++11) | computes arc cosine (\({\small\arccos{x}}\)arccos(x)) (function)[edit] |
(C++11) | computes arc cosine of a complex number (\({\small\arccos{z}}\)arccos(z)) (function template)[edit] |
