public Matrix invert()
{
Matrix mat = clone();
Matrix edin = Matrix.GetE2Matrix(row);
double N1 = 0, NInf = 0;
Matrix inv = clone();
for (int i = 0; i < row; i++)
{
double colsum = 0, rowsum = 0;
for (int j = 0; j < col; j++)
{
rowsum += Math.Abs(inv.matrix[i, j]);
colsum += Math.Abs(inv.matrix[j, i]);
}
N1 = Math.Max(colsum, N1);
NInf = Math.Max(rowsum, NInf);
}
inv = inv.transpose();
inv = inv.productNumber(1 / (N1 * NInf));
while (Math.Abs((mat * inv).getGaussDet() - 1) >= EPS)
{
Matrix prev = inv.clone();
inv = mat * prev;
inv = inv.productNumber(-1);
inv = inv + edin;
inv = prev * inv;
}
return(inv);
}
