C#•2y ago

❔ How can i reference a row in a 2D array?

I have a 6x8 2D array and i want to reference a row inside that 2D array.

16 Replies

idris_2020OP•2y ago

for example:

string[,] seats = new string[,]
            {
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
            };

string[,] seats = new string[,]
            {
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
            };

idris_2020OP•2y ago

how can i just get

idris_2020OP•2y ago

2nd row

Thinker•2y ago

There is no built-in way to do this, although you could write a pretty simple method for it.

idris_2020OP•2y ago

like?

TheRanger•2y ago

reference a row not copy it right?

idris_2020OP•2y ago

i want to make a 1D array from a row in a 2D array

TheRanger•2y ago

after u make that 1D array, would modifying it affect the data in the 2D array too?

idris_2020OP•2y ago

no just want to make a copy of it basically

MODiX•2y ago

TheRanger#3357

REPL Result: Success

public static T[] GetRow<T>(this T[,] array, int no)
{
    T[] data = new T[array.GetLength(1)];
    
    for(int i = 0; i < array.GetLength(1); i++)
    {
        data[i] = array[no,i];
    }
    
    return data;
}

    string[,] seats = new string[,]
        {
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"1", "1", "1", "1", "1", "1"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
        };
    
    string[] row = seats.GetRow(2);
    
    foreach(var d in row) Console.WriteLine(d);

public static T[] GetRow<T>(this T[,] array, int no)
{
    T[] data = new T[array.GetLength(1)];
    
    for(int i = 0; i < array.GetLength(1); i++)
    {
        data[i] = array[no,i];
    }
    
    return data;
}

    string[,] seats = new string[,]
        {
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"1", "1", "1", "1", "1", "1"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
            {"0", "0", "0", "0", "0", "0"},
        };
    
    string[] row = seats.GetRow(2);
    
    foreach(var d in row) Console.WriteLine(d);

Console Output

Compile: 648.994ms | Execution: 112.015ms | React with ❌ to remove this embed.

TheRanger•2y ago

well thats the 3rd row just change the index to what you need

idris_2020OP•2y ago

im getting 2 errors when i copy and paste that

idris_2020OP•2y ago

TheRanger•2y ago

ah no u need to define the extension method in a static class

using System;
                    
public class Program
{
    public static void Main()
    {
        string[,] seats = new string[,]
            {
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"1", "1", "1", "1", "1", "1"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
            };
        
        string[] row = seats.GetRow(2);
        
        foreach(var d in row) Console.WriteLine(d);
    }
}

public static class Extensions
{
    public static T[] GetRow<T>(this T[,] array, int no)
    {
        T[] data = new T[array.GetLength(1)];
        
        for(int i = 0; i < array.GetLength(1); i++)
        {
            data[i] = array[no,i];
        }
        
        return data;
    }
}

using System;
                    
public class Program
{
    public static void Main()
    {
        string[,] seats = new string[,]
            {
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"1", "1", "1", "1", "1", "1"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
                {"0", "0", "0", "0", "0", "0"},
            };
        
        string[] row = seats.GetRow(2);
        
        foreach(var d in row) Console.WriteLine(d);
    }
}

public static class Extensions
{
    public static T[] GetRow<T>(this T[,] array, int no)
    {
        T[] data = new T[array.GetLength(1)];
        
        for(int i = 0; i < array.GetLength(1); i++)
        {
            data[i] = array[no,i];
        }
        
        return data;
    }
}

a method can only be placed inside a class, it cannot be placed outside the class

idris_2020OP•2y ago

okay that works thanks how would i make so it be able to increment through each row so it prints each row nvm i did it

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How can i reference a row in a 2D array?