public static Tableau NextTableau(Tableau t, Variable pHead, Variable pRow)
{
var pIndex = t.IndexOf(pRow);
var pEq = t[pRow].Switch(pHead);
var equations = new Equation[t.Equations.Length];
for (int i = 0; i < equations.Length; i++)
{
if (i == pIndex)
{
equations[i] = pEq;
}
else
{
equations[i] = t[i].Resolve(pEq);
}
}
return(new Tableau(equations));
}
public Solver(StreamReader reader)
{
var cells = ReadAllLines(reader).Select(l => l.Split(';')).ToArray();
var vCnt = int.Parse(cells[0][0]);
var cCnt = int.Parse(cells[0][1]);
var pVars = new Variable[vCnt];
var sVars = new Variable[cCnt];
for (var i = 0; i < pVars.Length; i++)
{
pVars[i] = Variable.Problem(i + 1);
}
var eqs = new List <Equation>();
for (var i = 0; i < cCnt; i++)
{
var op = cells[i + 3][0];
var fCells = cells[i + 3].Skip(1).ToArray();
if (op == "<=" || op == "=")
{
eqs.Add(new Equation(Variable.Slack(i + 1), GetFactorsByLine(pVars, fCells, true), double.Parse(cells[i + 3][vCnt + 1])));
}
if (op == ">=" || op == "=")
{
eqs.Add(new Equation(Variable.Slack(i + 1), GetFactorsByLine(pVars, fCells, false), double.Parse(cells[i + 3][vCnt + 1])));
}
}
//target function
var tFactors = new VariableFactor[vCnt];
var minimize = cells[1][0].Contains("min");
for (var i = 0; i < tFactors.Length; i++)
{
var val = double.Parse(cells[1][i + 1]);
if (minimize)
{
val = -val;
}
tFactors[i] = new VariableFactor(pVars[i], val);
}
var targetVal = double.Parse(cells[1][vCnt + 1]);
if (minimize)
{
targetVal = -targetVal;
}
var target = new Equation(Variable.Target(), tFactors, targetVal);
eqs.Add(target);
_equations = eqs.ToArray();
}
public bool Equals(Equation other) => this == other;
