valarray cos() function in C++

valarray atan() function in C++

Last Updated : 24 Oct, 2018

The atan() function is defined in valarray header file. This function is used to calculate arc tangent of the value of each element in valarray and returns a valarray containing the arc tangent of all the elements.

Syntax:

atan(varr);

Parameter: This function takes a mandatory parameter varr which represents valarray.

Returns: This function returns a valarray containing the arc tangent of all the elements.

Below programs illustrate the above function:

Example 1:-

// C++ program to demonstrate 
// example of atan() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Initializing valarray 
    valarray<double> 
        varr = { 0, 0.25, 0.5, 0.75, 1 }; 
  
    // Declaring new valarray 
    valarray<double> varr1; 
  
    // use of atan() function 
    varr1 = atan(varr); 
  
    // Displaying new elements value 
    cout << "The new valarray with"
         << " manipulated values is : "
         << endl; 
  
    for (double& x : varr1) { 
        cout << x << " "; 
    } 
  
    cout << endl; 
  
    return 0; 
} 

Output:

The new valarray with manipulated values is : 
0 0.244979 0.463648 0.643501 0.785398

Example 2:-

// C++ program to demonstrate 
// example of atan() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
int main() 
{ 
    // Initializing valarray 
    valarray<double> 
        varr = { 0.2, 0.14, 5.0, 0.0 }; 
  
    // Declaring new valarray 
    valarray<double> varr1; 
  
    // use of atan() function 
    varr1 = atan(varr); 
  
    // Displaying new elements value 
    cout << "The new valarray with"
         << " manipulated values is : "
         << endl; 
  
    for (double& x : varr1) { 
        cout << x << " "; 
    } 
  
    cout << endl; 
  
    return 0; 
} 

Output:

The new valarray with manipulated values is : 
0.197396 0.139096 1.3734 0

valarray cos() function in C++

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