public object Clone()
{
SkylineMatrix2D <T> clone = new SkylineMatrix2D <T>(this.rowIndex);
this.data.CopyTo(clone.Data, 0);
return(clone);
}
public void Solve(IVector <double> f, double[] result)
{
//var e = DateTime.Now;
SkylineMatrix2D <T> K = this;
if (!K.isFactorized)
{
throw new InvalidOperationException("Cannot solve if matrix is not factorized.");
}
if (!(typeof(T) == typeof(double)))
{
throw new InvalidOperationException("Cannot solve for types other than double");
}
if (K.Rows != f.Length)
{
throw new InvalidOperationException("Matrix and vector size mismatch.");
}
double[] d = K.Data as double[];
//double[] result = new double[K.Rows];
f.CopyTo(result, 0);
// RHS vector reduction
int n;
for (n = 0; n < K.Rows; n++)
{
int KL = K.RowIndex[n] + 1;
int KU = K.RowIndex[n + 1] - 1;
if (KU >= KL)
{
int k = n;
double C = 0;
for (int KK = KL; KK <= KU; KK++)
{
k--;
C += d[KK] * result[k];
}
result[n] -= C;
}
}
// Back substitution
for (n = 0; n < K.Rows; n++)
{
result[n] /= d[K.RowIndex[n]];
}
n = K.Rows - 1;
for (int l = 1; l < K.Rows; l++)
{
int KL = K.RowIndex[n] + 1;
int KU = K.RowIndex[n + 1] - 1;
if (KU >= KL)
{
int k = n;
for (int KK = KL; KK <= KU; KK++)
{
k--;
result[k] -= d[KK] * result[n];
}
}
n--;
}
//var x = new List<TimeSpan>();
//x.Add(DateTime.Now - e);
}
