C++ <valarray> - atan() Function
The C++ <valarray> atan() function returns a valarray containing arc tangent value of all the elements of valarray va, in the same order. This function overloads with cmath's atan() function and calls this function once for each element.
Syntax
template<class T> valarray<T> atan (const valarray<T>& va);
Parameters
va |
Specify valarray containing elements of a type for which the function atan() is defined. |
Return Value
Returns valarray containing arc tangent value of all the elements of va.
Example:
The example below shows the usage of atan() function.
#include <iostream>
#include <valarray>
using namespace std;
int main (){
valarray<double> va1 = {0, 0.25, 0.5, 1};
//va2 will contain arc tangent value
//of all elements of va1
valarray<double> va2 = atan(va1);
cout<<fixed;
cout<<"va1 contains: ";
for(int i = 0; i < va1.size(); i++)
cout<<va1[i]<<" ";
cout<<"\nva2 contains: ";
for(int i = 0; i < va2.size(); i++)
cout<<va2[i]<<" ";
return 0;
}
The output of the above code will be:
va1 contains: 0.000000 0.250000 0.500000 1.000000 va2 contains: 0.000000 0.244979 0.463648 0.785398
❮ C++ <valarray> Library
