The **`Lgamma` function** in the Go programming language is used to find the value of the natural logarithm and sign of Gamma($x$), where $x$ is the input value to the `Lgamma` function.

To use the `Lgamma` function, you must import the `math` package in your file and access the `Lgamma` function within it using the `.` notation (`math.Lgamma`). Here, `Lgamma` is the actual function, while `math` is the Go package that stores the definition of this function.

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## Syntax

The definition of the `Lgamma` function inside the `math` package is shown below:

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## Parameters

The `Lgamma` function takes a single argument of type `float64`, whose gamma value and sign you wish to find.



## Return value
The `Lgamma` function returns two values:

* `lgamma`: This return value has type `float64` and represents the natural logarithm of Gamma($a$) ( here, $a$ represents the input value).

* `sign`: This return value has type `int` and represents the sign of the above value. This return value is restricted to either *+1* or *-1*.


Special cases of return values:

* `+Inf`: Positive infinity is returned if the input given is positive infinity, `0`, or a negative integer.

* `-Inf`: Negative infinity is returned if the input given is negative infinity.



* `NAN`: A `NAN` is returned if the input is `NAN`.





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## Examples

Below is a simple example in which we use the `Lgamma` function on 25:

package main

import "fmt"
import  "math"


func main() {
	inp := 25.0
	x, y := math.Lgamma(inp)
	fmt.Print("natural log of Gamma(",inp, "):", x,"\n")
  fmt.Println("sign:", y)
} 

What is the Lgamma function in Golang?

Lgamma in Golang computes the natural log and sign of Gamma function for a float64 input, returning values of type float64 and int.