C++ Math erf
The erf function computes the error function value of a parameter passed to the function.
Syntax
Suppose a number is 'x':
float erf( float x);
double erf( double x);
long double erf( long double x);
double erf( integral x);
Parameter
x : It is a floating point value.
Return value
It returns the error function value of x.
| Parameter | Return value | |
|---|---|---|
| x=±0 | ±0 | |
| x=± infinite | ±1 | |
| x=nan | nan |
Example 1
Let's see the simple example.
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
double x= 6.2;
cout<<"Value of x is : "<<x<<'\n';
cout<<"erf(x) : "<<erf(x);
return 0;}
Output:
Value of x is : 6.2
erf(x) : 1
In the above example, value of x is 6.2. The erf function returns the value i.e 1.
Example 2
Let's see the simple example when the value of x is infinite.
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
double x= 1.0/0.0;
cout<<"Value of x is : "<<x<<'\n';
cout<<"erf(x) : "<<erf(x);
return 0;
}
Output:
Value of x is : inf
erf(x) : 1
In the above example, the value of x is infinite. Therefore, the function erf returns the value 1.
Example 3
Let's see the simple example when the value of x is zero.
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
float x= 0.0;
cout<<"Value of x is : "<<x<<'\n';
cout<<"erf(x) : "<<erf(x);
return 0;
}
Output:
Value of x is : 0
erf(x) : 0
In the above example, the value of x is zero. Therefore, the function erf returns 0 value.
Example 4
Let's see the simple example when the value of x is nan.
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
float x= 0.0/0.0;
cout<<"Value of x is : "<<x<<'\n';
cout<<"erf(x) : "<<erf(x);
return 0;
}
Output:
Value of x is : -nan
erf(x) : -nan
In the above example, the value of x is nan. Therefore, the function erf returns nan.