private void RefreshTable()
{
var vars = new Dictionary<int, string>();
var rows = new Dictionary<int, Fraction[]>();
var freeCoefficients = new Dictionary<int, Fraction>();
int i;
for (i = 0; i < Rows.Count - 1; i++)
{
vars.Add(i, Rows[i].Cells[0].Value.ToString());
var tmp = new Fraction[_table.Variables.Count];
for (var j = 1; j < Rows[i].Cells.Count - 1; j++)
tmp[j - 1] = new Fraction(Rows[i].Cells[j].Value.ToString());
rows.Add(i, tmp);
freeCoefficients.Add(i, new Fraction(Rows[i].Cells[Rows[i].Cells.Count - 1].Value.ToString()));
}
_table.CopyRows(vars, rows, freeCoefficients);
var ratings = new Dictionary<int, MaxCoefficient>();
int k;
for (k = 1; k < Rows[i].Cells.Count - 1; k++)
{
if (Rows[i].Cells[k].Value == null)
{
ratings = null;
break;
}
ratings[k - 1] = new MaxCoefficient(Rows[i].Cells[k].Value.ToString());
}
_table.CopyRatings(ratings);
_table.FunctionValue = Rows[i].Cells[k].Value == null || Rows[i].Cells[k].Value.ToString() == ""
? null
: new MaxCoefficient(Rows[i].Cells[k].Value.ToString());
}
/// <summary>
/// Subtract maxCoefficient from current maxCoefficient
/// </summary>
/// <exception cref="NullReferenceException"></exception>
public void Subtract(MaxCoefficient maxCoefficient)
{
_mCoefficient.Add(maxCoefficient._mCoefficient * -1);
_freeCoefficient.Add(maxCoefficient._freeCoefficient * -1);
}
/// <summary>
/// Represents copy of maxCoefficient
/// </summary>
/// <exception cref="NullReferenceException"></exception>
public MaxCoefficient(MaxCoefficient maxCoefficient)
{
_mCoefficient = new Fraction(maxCoefficient._mCoefficient);
_freeCoefficient = new Fraction(maxCoefficient._freeCoefficient);
}
/// <summary>
/// Method for value comparison of maxCoefficients
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if current maxCoefficient > input maxCoefficient
/// -1: if input maxCoefficient > current maxCoefficient
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public int CompareTo(MaxCoefficient maxCoefficient)
{
if (ReferenceEquals(maxCoefficient, null))
return -1;
return _mCoefficient == maxCoefficient._mCoefficient
? _freeCoefficient.CompareTo(maxCoefficient._freeCoefficient)
: _mCoefficient.CompareTo(maxCoefficient._mCoefficient);
}
/// <summary>
/// Method for value comparison of current and input maxCoefficients
/// </summary>
/// <param name="maxCoefficient">MaxCoefficient for comparison</param>
/// <returns>Return true if values of input and current maxCoefficient are equal</returns>
/// <exception cref="NullReferenceException"></exception>
public bool Equals(MaxCoefficient maxCoefficient)
{
if (ReferenceEquals(null, maxCoefficient)) return false;
if (ReferenceEquals(this, maxCoefficient)) return true;
return Equals(maxCoefficient._mCoefficient, _mCoefficient) && Equals(maxCoefficient._freeCoefficient, _freeCoefficient);
}
/// <summary>
/// Method for value comparison of maxCoefficients
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if first > second
/// -1: if second > first
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public static int Compare(MaxCoefficient first, MaxCoefficient second)
{
if (ReferenceEquals(first, null))
if (ReferenceEquals(second, null))
return 0;
else
throw new NullReferenceException();
return first.CompareTo(second);
}
/// <summary>
/// Add maxCoefficient to current maxCoefficient
/// </summary>
/// <exception cref="NullReferenceException"></exception>
public void Add(MaxCoefficient maxCoefficient)
{
_mCoefficient.Add(maxCoefficient._mCoefficient);
_freeCoefficient.Add(maxCoefficient._freeCoefficient);
}
/// <summary>
/// Method for value comparison of maxCoefficient and fraction
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if maxCoefficient > fraction
/// -1: if fraction > maxCoefficient
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public static int Compare(MaxCoefficient maxCoefficient, Fraction fraction)
{
return maxCoefficient.CompareTo(fraction);
}
/// <summary>
/// Method for value comparison of maxCoefficient and fraction
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if fraction > maxCoefficient
/// -1: if maxCoefficient > fraction
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public static int Compare(Fraction fraction, MaxCoefficient maxCoefficient)
{
return (maxCoefficient.CompareTo(fraction) * -1);
}
/// <summary>
/// Method for value comparison of maxCoefficient and number
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if number > maxCoefficient
/// -1: if maxCoefficient > number
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public static int Compare(int number, MaxCoefficient maxCoefficient)
{
return (maxCoefficient.CompareTo(number) * -1);
}
/// <summary>
/// Method for value comparison of maxCoefficient and number
/// </summary>
/// <returns>
/// 0: if they are equal
/// 1: if maxCoefficient > number
/// -1: if number > maxCoefficient
/// </returns>
/// <exception cref="NullReferenceException"></exception>
public static int Compare(MaxCoefficient maxCoefficient, int number)
{
return maxCoefficient.CompareTo(number);
}
/// <summary>
/// Returns index of solving cell(or -1 if table has no positive rating)
/// </summary>
/// <param name="table">Table with calculated ratings</param>
/// <param name="solvingRowIndex">Index of solving row</param>
private int GetSolvingCellIndex(SimplexTable table, int solvingRowIndex)
{
if (solvingRowIndex < 0) return -1;
var minRatioIndex = -1;
var minRatio = new MaxCoefficient();
for (var i = 0; i < table.Variables.Count; i++)
{
var matrixElement = table.GetMatrixElement(solvingRowIndex, i);
if (matrixElement >= 0) continue;
var rating = table.Ratings[i];
var currRatio = new MaxCoefficient(rating);
currRatio.Multiply(1 / matrixElement);
if (currRatio.CompareTo(minRatio) != -1 && minRatioIndex != -1) continue;
minRatioIndex = i;
minRatio = currRatio;
}
return minRatioIndex;
}
/// <summary>
/// Calculates ratings
/// </summary>
public void CalculateRatings()
{
_ratings = new Dictionary<int, MaxCoefficient>();
var rowsCount = _rows.Count;
foreach (var variableId in _allVariables.Keys)
{
var rating = new MaxCoefficient();
for (var rowIndex = 0; rowIndex < rowsCount; rowIndex++)
{
var tmp = new MaxCoefficient(_targetFunctionCoefficients[_basisVariables[rowIndex]]);
var fraction = new Fraction(_rows[rowIndex].ElementAt(variableId));
tmp.Multiply(fraction);
rating.Add(tmp);
}
rating.Subtract(_targetFunctionCoefficients[variableId]);
_ratings.Add(variableId, rating);
}
FunctionValue = CalculateFunctionValue();
}
/// <summary>
/// Gets function value
/// </summary>
public MaxCoefficient CalculateFunctionValue()
{
var tmpResult = new MaxCoefficient();
foreach (var elem in _basisVariables)
{
var varCoefficient = new MaxCoefficient(_targetFunctionCoefficients[elem.Value]);
var varValue = new Fraction(_freeCoefficients[elem.Key]);
varCoefficient.Multiply(varValue);
tmpResult.Add(varCoefficient);
}
return tmpResult;
}
