public static BigTableau CreateBigTableau(ArtEqSimplexProblem p,
Action<string, object> notify)
{
if (notify != null) {
notify("Problem:", p);
}
int m = p.A.Length;
int n = p.c.Length;
int nVars = n - m;
double[][] t = new double[m + 1][];
for (int i = 0; i < m; i++) {
t[i] = new double[n + 1];
Array.Copy(p.A[i], t[i], n);
t[i][n] = p.b[i];
}
t[m] = new double[n + 1];
for (int i = 0; i < n; i++) {
t[m][i] = -p.c[i];
}
int[] ind = new int[m];
for (int i = 0; i < ind.Length; i++) {
ind[i] = nVars + i;
}
BigTableau bt = new BigTableau(m, n, t, ind);
if (notify != null) {
notify("Artificial tableau before new objectives:", bt);
}
// Solving the new objective function.
for (int j = 0; j <= n; j++) {
t[m][j] = 0;
}
for (int i = 0; i < p.art.Length; i++) {
for (int j = 0; j < m; j++) {
t[m][j] -= t[p.art[i] - nVars][j];
}
t[m][n] -= t[p.art[i] - nVars][n];
}
if (notify != null) {
notify("Artificial tableau after new objectives:", bt);
}
return bt;
}
public static BigTableau EliminateArtificials(BigTableau bt,
ArtEqSimplexProblem p, EqSimplexProblem pOrig)
{
int nVars = bt.n - bt.m;
int n2 = bt.n - p.art.Length;
double[][] t = new double[bt.m + 1][];
for (int i = 0; i <= bt.m; i++) {
t[i] = new double[n2 + 1];
}
int k = 0;
for (int j = 0; j < bt.n; j++) {
if (j >= nVars && p.baseVar[j - nVars] == -1) {
continue;
}
for (int i = 0; i < bt.m; i++) {
t[i][k] = bt.t[i][j];
}
k++;
}
// Copy RHS.
for (int i = 0; i < bt.m; i++) {
t[i][n2] = bt.t[i][bt.n];
}
// Restoring the indices.
int[] ind = (int[])bt.ind.Clone();
for (int i = 0; i < ind.Length; i++) {
if (ind[i] >= nVars) {
ind[i] = p.baseVar[ind[i] - nVars];
}
}
bool[] nonBase = NonBase2(ind, n2);
// Solving the new objective function.
for (int j = 0; j <= n2; j++) {
if (!nonBase[j]) {
continue;
}
for (int i = 0; i < bt.m; i++) {
Console.WriteLine(j + " " + i + " ::: " + ind[i] + " " + t[i][j] + " " + pOrig.c[ind[i]]);
t[bt.m][j] += t[i][j] * pOrig.c[ind[i]];
}
}
return new BigTableau(bt.m, n2, t, ind);
}
public BigTableau simplexEqArtTableau(ArtEqSimplexProblem p)
{
return Simplex.CreateBigTableau(p, notify);
}
