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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valarray<T> apply( T func(T))const; | ||
valarray<T> apply( T func(const T&))const; | ||
Returns a new valarray of the same size with values which are acquired by applying functionfunc
to the previous values of the elements.
Contents |
func | - | function to apply to the values |
The resulting valarray with values acquired by applying functionfunc
.
The function can be implemented with the return type different fromstd::valarray. In this case, the replacement type has the following properties:
Following straightforward implementations can be replaced by expression templates for a higher efficiency.
template<class T>valarray<T> valarray<T>::apply(T func(T))const{ valarray<T> other=*this;for(T& i: other) i= func(i);return other;} template<class T>valarray<T> valarray<T>::apply(T func(const T&))const{ valarray<T> other=*this;for(T& i: other) i= func(i);return other;} |
Calculates and prints the first 10 factorials.
#include <cmath>#include <iostream>#include <valarray> int main(){std::valarray<int> v={1,2,3,4,5,6,7,8,9,10}; v= v.apply([](int n)->int{returnstd::round(std::tgamma(n+1));});for(auto n: v)std::cout<< n<<' ';std::cout<<'\n';}
Output:
1 2 6 24 120 720 5040 40320 362880 3628800
applies a unaryfunction object to elements from arange (function template)[edit] | |
(C++20) | applies a unaryfunction object to elements from arange (algorithm function object)[edit] |