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Mir
Mir

Reputation: 165

Matrix with List<List <string > > Indexof

I need to simulate a Matrix of data and Im using a List<List <string >>. Im using the IndexOf to search an element in a list of the list.

Matrix[0].IndexOf('Search');

But is it possible to make a kind of IndexOf in Matrix?

Upvotes: 0

Views: 333

Answers (4)

digEmAll
digEmAll

Reputation: 57220

You could use FindIndex method:

int index = Matrix.FindIndex(x => x[colIndex] == "Search");

This method is obviously useful if you want to search the row index by knowing the column to search in.

If you want to search in the whole matrix you could write a simple method:

public static Tuple<int,int> PositionOf<T>(this List<List<T>> matrix, T toSearch)
{
    for (int i = 0; i < matrix.Count; i++)
    {
        int colIndex = matrix[i].IndexOf(toSearch);
        if (colIndex >= 0 && colIndex < matrix[i].Count)
            return Tuple.Create(i, colIndex);
    }
    return Tuple.Create(-1, -1);
}

Upvotes: 2

Tigran
Tigran

Reputation: 62276

You may be are asking for something like :

Example 

public void MatrixIndexOf(string content) {
      var result = matrix.Select((value, index)=> new {
        _i = index,
       _str = value
      }).Where(x=>x._str.Contains(content));
}

after this result is anonymous type where_i is index.

Upvotes: 0

Yuriy Faktorovich
Yuriy Faktorovich

Reputation: 68707

You'd have to make your own class to achieve it.

public class Matrix<T>
{
    public void IndexOf<T>(T value, out int x, out int y){...}
}

or use an extension on your type

public static void IndexOf<T>(this List<List<T>> list, out int x, out int y){...}

Personally, I'd make the extension on a 2 dimensional array rather than List<List<T>>.

Upvotes: 1

Arsen Mkrtchyan
Arsen Mkrtchyan

Reputation: 50752

for(int i = 0; i<Matrix.Length; i++)
    for(int j = 0; j<Matrix.Length; j++)
        if(Matrix[i][j] == "Search")
        {
            //OUT i,j;
            return;
        }

Upvotes: 0

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