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# math.Y1() Function in Golang With Examples

• Last Updated : 13 Apr, 2020

Go language provides inbuilt support for basic constants and mathematical functions to perform operations on the numbers with the help of the math package. You can find the order-one Bessel function of the second kind with the help of Y1() function provided by the math package. So, you need to add a math package in your program with the help of the import keyword to access the Y1() function.

Syntax:

func Y1(a float64) float64
• If you pass +Inf in this function like Y1(+Inf), then this function will return 0.
• If you pass 0 in this function like Y1(0), then this function will return -Inf.
• If the value of a<0, then this function will return NaN.
• If you pass NaN in this function like Y1(NaN), then this function will return NaN.

Example 1:

 // Golang program to illustrate// the use of math.Y1() function  package main  import (    "fmt"    "math")  // Main functionfunc main() {      // Finding the order-one Bessel    // function of the second kind    // Using Y1() function    res_1 := math.Y1(-3)    res_2 := math.Y1(6)    res_3 := math.Y1(math.Inf(1))    res_4 := math.Y1(math.NaN())    res_5 := math.Y1(4.6)    res_6 := math.Y1(0)      // Displaying the result    fmt.Println("Result 1: ", res_1)    fmt.Println("Result 2: ", res_2)    fmt.Println("Result 3: ", res_3)    fmt.Println("Result 4: ", res_4)    fmt.Println("Result 5: ", res_5)    fmt.Println("Result 6: ", res_6)  }

Output:

Result 1:  NaN
Result 2:  -0.17501034430039827
Result 3:  0
Result 4:  NaN
Result 5:  0.2737452414709432
Result 6:  -Inf

Example 2:

 // Golang program to illustrate// the use of math.Y1() function  package main  import (    "fmt"    "math")  // Main functionfunc main() {      // Finding the order-one Bessel    // function of the second kind    // Using Y1() function    nvalue_1 := math.Y1(0.89)    nvalue_2 := math.Y1(6)      // Sum of the given numbers    res := nvalue_1 + nvalue_2    fmt.Printf("%.3f + %.3f = %.3f",             nvalue_1, nvalue_2, res)  }

Output:

-0.883 + -0.175 = -1.058

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