| Common mathematical functions | |||||||||||||||||||||||||||||||
| Mathematical special functions(C++17) | |||||||||||||||||||||||||||||||
| Mathematical constants(C++20) | |||||||||||||||||||||||||||||||
| Basic linear algebra algorithms(C++26) | |||||||||||||||||||||||||||||||
| Data-parallel types (SIMD)(C++26) | |||||||||||||||||||||||||||||||
| Floating-point environment(C++11) | |||||||||||||||||||||||||||||||
| Complex numbers | |||||||||||||||||||||||||||||||
Numeric array (valarray) | |||||||||||||||||||||||||||||||
| Pseudo-random number generation | |||||||||||||||||||||||||||||||
| Bit manipulation(C++20) | |||||||||||||||||||||||||||||||
| Saturation arithmetic(C++26) | |||||||||||||||||||||||||||||||
| Factor operations | |||||||||||||||||||||||||||||||
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| Interpolations | |||||||||||||||||||||||||||||||
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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> atan(const valarray<T>& va); | ||
For each element inva computes arc tangent of the value of the element.
Contents |
| va | - | value array to apply the operation to |
Value array containing arc tangents of the values inva.
Unqualified function (atan) is used to perform the computation. If such function is not available,std::atan 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> atan(const valarray<T>& va){ valarray<T> other= va;for(T& i: other) i= atan(i); return other;// proxy object may be returned} |
#include <algorithm>#include <cmath>#include <iostream>#include <valarray> auto show=[](charconst* title,conststd::valarray<float>& va){std::cout<< title<<" :";std::for_each(std::begin(va),std::end(va),[](constfloat x){std::cout<<" "<<std::fixed<< x;});std::cout<<'\n';}; int main(){conststd::valarray<float> x={.1f,.3f,.6f,.9f};conststd::valarray<float> f=std::atan(x);conststd::valarray<float> g=std::tan(f); show("x ", x); show("f = atan(x)", f); show("g = tan(f) ", g);}
Output:
x : 0.100000 0.300000 0.600000 0.900000f = atan(x) : 0.099669 0.291457 0.540420 0.732815g = tan(f) : 0.100000 0.300000 0.600000 0.900000
| applies the functionstd::asin to each element of valarray (function template)[edit] | |
| applies the functionstd::acos to each element of valarray (function template)[edit] | |
| applies the functionstd::atan2 to a valarray and a value (function template)[edit] | |
| applies the functionstd::tan to each element of valarray (function template)[edit] | |
(C++11)(C++11) | computes arc tangent (\({\small\arctan{x}}\)arctan(x)) (function)[edit] |
(C++11) | computes arc tangent of a complex number (\({\small\arctan{z}}\)arctan(z)) (function template)[edit] |
