How do I place sprites with my script and a 2D array?

Questions & Answers
1

Lets say I create a 5x5 2D array. With a few randomly chosen elements to equal 1.

int[,] MapArray = new int[4, 4];
MapArray[0, 3] = 1;
MapArray[1, 4] = 1;
MapArray[2, 3] = 1;
MapArray[5, 1] = 1;

What I want to do is place one of my already made sprites at the position of the 1’s in the game so that with enough 1’s I could make a good map. (The sprite to go at the 1’s can just be a plain square).

2

If i want to place a sprite at the values of 1s i would do the following:

// defaine a multi-dimentional array an intialize some indices with 1
        int[,] MapArray = new int[5, 5];
        MapArray[0, 3] = 1;
        MapArray[1, 4] = 1;
        MapArray[2, 3] = 1;
        MapArray[4, 1] = 1;

        // for each row find the value 1 in each column
        for (int r = 0; r < MapArray.GetLength(0); r++)
            for (int c = 0; c < MapArray.GetLength(1); c++)
            {
                if (MapArray[r, c] == 1)  // if the value of this index is 1
                {
                    // .. Instantiate your sprites here 
                }
            }
3

Edit - Update the code to work properly

    //2D Sprite object to spawn in at coordinates
    public GameObject blockObj;

    //Map height and mapWidth
    const int mapWidth = 4;
    const int mapHeight = 4;

    //Creating the array with width and height of a predefined value

    void Start()
    {
        //Create the map, and update the map
        int[,] MapArray = CreateMap();
        UpdateMap(MapArray);
    }

    //Define values where the 1's go here
    int[,] CreateMap()
    {
        int[,] mapArray = new int[mapWidth, mapHeight];

        //These values must be within [0,0] - [4,4] for a 5x5 grid
        mapArray[0, 1] = 1;
        mapArray[1, 1] = 1;
        mapArray[2, 1] = 1;
        mapArray[3, 1] = 1;

        return mapArray;
    }
    
    void UpdateMap(int[,] MapArray)
    {
        //Iterating through the list with 'x' and 'y' representing the x and y cartesian coordinates
        for (int y = 0; y < mapHeight; y++)
        {
            for (int x = 0; x < mapWidth; x++)
            {
                //If the current index has a value of 1
                if (MapArray[x, y] == 1)
                {
                    //Create a block at this point
                    Instantiate(blockObj, new Vector3(x, y, 0), Quaternion.identity);
                }
            }
        }
    }