find the variance of all elements in an array in go

To find the variance of all elements in an array in Go, we can use the stat package from the gonum.org/v1/gonum/stat library. Here's an example code snippet that demonstrates how to do this:

main.go
package main

import (
    "fmt"
    "gonum.org/v1/gonum/stat"
)

func main() {
    arr := []float64{1, 2, 3, 4, 5}
    variance := stat.Variance(arr, nil)

    fmt.Printf("Variance of all elements in the array: %f\n", variance)
}
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In this code, we create an array called arr containing some float64 values, and then calculate the variance of all elements in the array using the stat.Variance() function from the gonum.org/v1/gonum/stat library.

The first argument to the Variance() function is the array itself, and the second argument is an optional array of weights. In this example, we pass nil for the weights to get the variance of all elements in the array with equal weights.

Finally, we print out the variance of all elements in the array using the fmt.Printf() function.