Java Math log1p() Method

May 30, 2023

Java Math Class

Java Math class provides several methods to perform several operations on math calculations like max(), min(), sin(), cos(), round(), ceil(), floor(), abs() etc.
The java.lang.Math class contains various methods for performing basic numeric operations
Here, in the page we will discuss about the math log1p() Method in java.

Java Math log1p() Method :

In Java, the Math.log1p(double x) method returns the natural logarithm (base e) of the sum of the argument and 1. This method is useful for calculating the logarithm of a number that is very close to 1, as the log1p() method is more accurate than the Math.log() method when the argument is close to 0.

The log1p() method takes a single parameter, x, which is the value for which the logarithm is to be calculated. It returns a double value representing the natural logarithm of x + 1.

Special cases:

If the argument is NaN or less than -1, then the result is NaN.
If the argument is positive infinity, then the result is positive infinity.
If the argument is negative one, then the result is negative infinity.
If the argument is zero, then the result is a zero with the same sign as the argument.

Syntax :

public static double log1p(double x)

Parameters : x - a valuee

Throws Exception : It does not throw any exception.

Return Value : The value ln(x + 1), the natural log of x + 1

max() Function

min() Function

multiplyexact() Function

negateexact() Function

nextafter() Function

Example 1 :

Run

public class Main {
    public static void main(String[] args) {
        double x = 0.1;
        double result = Math.log1p(x);
        System.out.println(result); // prints 0.09531017980432487
    }
}

Output :

0.09531017980432487

Explanation : This code defines a main method and a single local variable, x, which is initialized to 0.1. It then calls the Math.log1p() method with x as the argument, and stores the result in the result variable. Finally, it prints the value of result to the console using the System.out.println() method.

Example 2:

Run

public class Main {
    public static void main(String[] args) {
        double x1 = Double.NaN;
        double x2 = -1.1;
        double x3 = Double.POSITIVE_INFINITY;
        double x4 = -1.0;
        double x5 = 0.0;
        
        double result1 = Math.log1p(x1);
        double result2 = Math.log1p(x2);
        double result3 = Math.log1p(x3);
        double result4 = Math.log1p(x4);
        double result5 = Math.log1p(x5);
        
        System.out.println(result1); // prints NaN
        System.out.println(result2); // prints NaN
        System.out.println(result3); // prints Infinity
        System.out.println(result4); // prints -Infinity
        System.out.println(result5); // prints 0.0
    }
}

Output :

NaN
NaN
Infinity
-Infinity
0.0

Explanation : In this example, we have check all special case of log1p() method in java those are mentioned on the top

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Java Math log1p() Method

Java Math Class

Java Math log1p() Method :

Special cases:

Syntax :

Example 1 :

Output :

Example 2:

Output :

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