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valarray tanh() function in C++
  • Last Updated : 24 Oct, 2018

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

Syntax:

tanh(varr);

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

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

Below programs illustrate the above function:



Example 1:-




// C++ program to demonstrate
// example of tanh() 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 tanh() function
    varr1 = tanh(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 0.244919 0.462117 0.635149 0.761594

Example 2:-




// C++ program to demonstrate
// example of tanh() function.
  
#include <bits/stdc++.h>
using namespace std;
int main()
{
    // Initializing valarray
    valarray<double>
        varr = { 0.2, 0.14, 1.0, 0.0 };
  
    // Declaring new valarray
    valarray<double> varr1;
  
    // use of tanh() function
    varr1 = tanh(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 : 
0.197375 0.139092 0.761594 0
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