Question

How to check if a sequence of numbers is a Harmonic progression (reciprocals Arithmetic progression) in Go

Answer 1

// a, b, c, d are HP if 1/a, 1/b, 1/c, 1/d are AP -> 1/a, 1/(a+diff), 1/(a+2*diff)...

package main

import (
	"fmt"
)

func isHarmonicProgression(arr []float64) int {
	size := len(arr)
	if size == 1 {
		return 1
	}

	difference := (1.0 / arr[1]) - (1.0 / arr[0])

	for i := 2; i < size; i++ {
		if (1.0/arr[i])-(1.0/arr[i-1]) != difference {
			return 0
		}
	}

	return 1
}

func main() {
	arr := []float64{1.0 / 5, 1.0 / 10, 1.0 / 15, 1.0 / 20, 1.0 / 25}

	if isHarmonicProgression(arr) == 1 {
		fmt.Println("Yes")
	} else {
		fmt.Println("No")
	}
}



/*
run:

Yes

*/

 

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