Question

How to create an M x N matrix with random numbers in Go

Answer 1

package main

import (
    "fmt"
    "math/rand"
    "time"
)

const (
    ROWS = 4
    COLS = 5
)

// Print matrix to console
func printMatrix(matrix [][]int) {
    for _, row := range matrix {
        for _, val := range row {
            fmt.Printf("%4d", val)
        }
        fmt.Println()
    }
}

// Generate a random integer between min and max inclusive
func generateRandomInteger(min, max int) int {
    return rand.Intn(max-min+1) + min
}

// Generate a rows x cols matrix filled with random integers
func generateRandomMatrix(rows, cols int) [][]int {
    rand.Seed(time.Now().UnixNano())
    matrix := make([][]int, rows)
    for i := 0; i < rows; i++ {
        matrix[i] = make([]int, cols)
        for j := 0; j < cols; j++ {
            matrix[i][j] = generateRandomInteger(1, 100)
        }
    }
    
    return matrix
}

func main() {
    matrix := generateRandomMatrix(ROWS, COLS)
    printMatrix(matrix)
}



/*
run:
    
  71  27  88  61  86
  76  22  60  99  57
  49  97  13  55   7
  22  80  30  32  19
    
*/

 

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