在Golang中随机生成矩阵

Question

I'm currently writing a program and I want to randomly generate a matrix.

Currently I'm pre-setting the values in it as follows:

    m1 := [3][3]int{
    [3]int{1, 1, 1},
    [3]int{4, 1, 7},
    [3]int{1, 65, 1},
}

However I want the values inputted to be randomly generated in a range from 1-100.

import "math/rand"

I am importing the above library and trying to utilise it.

I have attempted to get this working however can't seem to make any headway.

    m1 := [3][3]int{
    [3]int{rand.Intn, 1, 1},
    [3]int{4, 1, 7},
    [3]int{1, 65, 1},
}

I have attempted to complete it with the above solution to make the first number random however I get the following error.

cannot use rand.Intn (type func(int) int) as type int in array or slice literal

Any help greatly appreciated.

Answer 1

The direct answer is the fact that rand.Intn() generates a random integer between 0 and n, where n is a parameter to this method. The error that you are getting is the compiler complaining that you are trying to initialize an int value with a function that requires two ints and returns one - you are trying to assign a function to an int. So the correct call would be something like rand.Intn(100), which will give you a random number between 0 - 100.

However, why do it this way? Why not dynamically initialize your array with random numbers as:

m1 := [3][3]int{}
for i:=0; i<3; i++ {
    for j:=0; j<3; j++ {
        m1[i][j] = rand.Int()
    }
}