/// <summary>
/// Changes basis(returns new object)
/// </summary>
public SimplexTable ChangeBasis(SimplexTable table, SolvingElementIndexes solvingElement)
{
var tableCopy = new SimplexTable(table);
if (solvingElement.RowIndex < 0 || solvingElement.CellIndex < 0) return tableCopy;
tableCopy.ChangeBasis(solvingElement.RowIndex, solvingElement.CellIndex);
return tableCopy;
}