public int DetMod(int prime_number)
{
IntegerSquareMatrix triangleMatrix = new IntegerSquareMatrix(Rows, elements);
int signOfDet = 0;
for (int i = 0; i < triangleMatrix.Rows; i++)
{
for (int j = i; j < triangleMatrix.Columns; j++)
{
if (triangleMatrix[j, i] != 0)
{
int reverselement = NumberFunctions.GetMulInverse(triangleMatrix[j, i], prime_number);
for (int k = j; k < triangleMatrix.Columns; k++)
{
triangleMatrix[j, k] *= reverselement;
triangleMatrix[j, k] %= prime_number;
}
if (i != j)
{
triangleMatrix = triangleMatrix.SwapLine(j, i);
signOfDet++;
signOfDet %= 2; //ОПРЕДЕЛЯЮ ЗНАК det
}
for (int k = j + 1; k < triangleMatrix.Columns; k++)
{
while (triangleMatrix[k, j] != 0)
{
if (triangleMatrix[k, j] > 0)
{
triangleMatrix = triangleMatrix.SubtractionOfLines(k, j);
}
else
{
triangleMatrix = triangleMatrix.AdditionOfLines(k, j);
}
}
}
}
}
}
int det = 1;
for (int i = 0; i < triangleMatrix.Columns; i++)
{
det *= triangleMatrix[i, i];
}
if (signOfDet == 0)
{
return(det);
}
else
{
return(-1 * det);
}
}
public IntegerSquareMatrix ToTopTriangleMatrixModPrime(int primeNumber, int degree)
{
IntegerSquareMatrix triangleMatrix = new IntegerSquareMatrix(Rows, elements);
int sign_of_det = 0;
int primeNumber1 = Convert.ToInt32(Math.Pow(primeNumber, degree));
for (int i = 0; i < triangleMatrix.Rows; i++)
{
for (int j = i; j < triangleMatrix.Columns; j++)
{
if (triangleMatrix[j, i] != 0)
{
int reverselement = NumberFunctions.GetMulInverse(triangleMatrix[j, i], primeNumber1);
for (int k = j; k < triangleMatrix.Columns; k++)
{
triangleMatrix[j, k] *= reverselement;
triangleMatrix[j, k] %= primeNumber1;
}
if (i != j)
{
triangleMatrix = triangleMatrix.SwapLine(j, i);
sign_of_det++;
sign_of_det %= 2; //ОПРЕДЕЛЯЮ ЗНАК det
}
for (int k = j + 1; k < triangleMatrix.Columns; k++)
{
while (triangleMatrix[k, j] != 0)
{
if (triangleMatrix[k, j] > 0)
{
triangleMatrix = triangleMatrix.SubtractionOfLines(k, j);
}
else
{
triangleMatrix = triangleMatrix.AdditionOfLines(k, j);
}
}
}
}
}
}
return(triangleMatrix);
}