using System;

using KGySoft.Collections;

using KGySoft.CoreLibraries;

public class Program

{

    public static void Main()

    {

        double[] vals = new double[100];

        vals[10] = 123.456;

        // None of the assignments below do new allocations

        // intperpret it as a 2D array

        Array2D<double> output = vals.AsArray2D(height: 10, width: 10);

        Console.WriteLine($"output[1, 0]: {output[1, 0]}");

        // you can even slice it like Spans

        Array2D<double> someRows = output[1..2];

        Console.WriteLine($"someRows[0, 0]: {someRows[0, 0]}");

        // or obtain a single row as a 1D array

        ArraySection<double> row = output[1];

        Console.WriteLine($"row[0]: {row[0]}");

        // or reinterpet the whole thing as a single dimensional span

        Span<double> as1DSpan = output.AsSpan;

        Console.WriteLine($"as1DSpan[10]: {as1DSpan[10]}");

    }

}