[Solved] How to sort matrix column values then rows?

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You will need a row comparer. We’ll keep in mind that all rows have same length:

public class RowComparer : IComparer<IEnumerable<int>>
{
    public int Compare(IEnumerable<int> x, IEnumerable<int> y)
    {
        // TODO: throw ArgumentNullException 
        return x.Zip(y, (xItem, yItem) => xItem.CompareTo(yItem))
                .Where(c => c != 0).FirstOrDefault();
    }
}

And use it for sorting:

inputRows.Select(r => r.OrderBy(x => x)).OrderBy(r => r, new RowComparer())

Output for your sample:

[
  [ 1, 2 ],
  [ 2, 2 ],
  [ 2, 3 ]
]

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solved How to sort matrix column values then rows?