Mastering Go - Second Edition

Multiplying matrices

As you already know, multiplying matrices is much more complex than adding or subtracting matrices, which is also shown in the number of command-line arguments that the presented utility, which is named mulMat.go, requires. The mulMat.go utility, which is going to be presented in four parts, requires four command-line arguments, which are the dimensions of the first and the second matrices, respectively.

The first part of mulMat.go is as follows:

package main 
 
import ( 
    "errors" 
    "fmt" 
    "math/rand" 
    "os" 
    "strconv" 
    "time" 
) 
 
func random(min, max int) int { 
    return rand.Intn(max-min) + min 
} 

The second part of mulMat.go contains the following Go code:

func multiplyMatrices(m1 [][]int, m2 [][]int) ([][]int, error) { if len(m1[0]) ...