private static void trinomial_test()
//****************************************************************************80
//
// Purpose:
//
// TRINOMIAL_TEST tests TRINOMIAL.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 11 April 2015
//
// Author:
//
// John Burkardt
//
{
int k;
Console.WriteLine("");
Console.WriteLine("TRINOMIAL_TEST");
Console.WriteLine(" TRINOMIAL evaluates the trinomial coefficient:");
Console.WriteLine("");
Console.WriteLine(" T(I,J,K) = (I+J+K)! / I! / J! / K!");
Console.WriteLine("");
Console.WriteLine(" I J K T(I,J,K)");
Console.WriteLine("");
for (k = 0; k <= 4; k++)
{
int j;
for (j = 0; j <= 4; j++)
{
int i;
for (i = 0; i <= 4; i++)
{
int t = Trinomial.trinomial(i, j, k);
Console.WriteLine(" " + i.ToString(InvariantCulture).PadLeft(4)
+ " " + j.ToString(InvariantCulture).PadLeft(4)
+ " " + k.ToString(InvariantCulture).PadLeft(4)
+ " " + t.ToString(InvariantCulture).PadLeft(8) + "");
}
}
}
}
public List <TrinomialSolutionDto> Trinomial(Trinomial trinomial)
{
var solution = _algebra.Trinomial(trinomial.Equation, trinomial.A, trinomial.B, trinomial.C);
return(solution);
}
public static double[] poly_power_linear(int d1, double[] p1, int n)
//****************************************************************************80
//
// Purpose:
//
// POLY_POWER_LINEAR computes the polynomial ( a + b*x + c*y ) ^ n.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 21 April 2015
//
// Author:
//
// John Burkardt
//
// Parameters:
//
// Input, int D1, the degree of the linear polynomial,
// which should be 1 (or possibly 0).
//
// Input, double P1(M1), the coefficients of the linear polynomial.
// M1 = ( (D1+1)*(D1+2) ) / 2, which should be 3.
//
// Input, int N, the power to which the polynomial is to be
// raised. 0 <= N.
//
// Output, double P2(M2), the coefficients of the power polynomial.
// D2 = N * D1;
// M2 = ( (D2+1)*(D2+2) ) / 2.
//
{
int i;
switch (d1)
{
case < 0:
Console.WriteLine("");
Console.WriteLine("POLY_POWER_LINEAR - Fatal error!");
Console.WriteLine(" D1 < 0.");
return(null);
}
switch (n)
{
case < 0:
Console.WriteLine("");
Console.WriteLine("POLY_POWER_LINEAR - Fatal error!");
Console.WriteLine(" N < 0.");
return(null);
}
int d2 = n * d1;
int m2 = (d2 + 1) * (d2 + 2) / 2;
double[] p2 = new double[m2];
switch (d1)
{
case 0:
p2[0] = Math.Pow(p1[0], n);
return(p2);
}
switch (n)
{
case 0:
p2[0] = 1.0;
return(p2);
}
//
// Use the Trinomial formula.
//
for (i = 0; i <= n; i++)
{
int j;
for (j = 0; j <= n - i; j++)
{
int k;
for (k = 0; k <= n - i - j; k++)
{
//
// We store X^J Y^K in location L.
//
int l = pascal_to_i4(j, k);
p2[l - 1] = Trinomial.trinomial(i, j, k)
* Math.Pow(p1[0], i) * Math.Pow(p1[1], j) * Math.Pow(p1[2], k);
}
}
}
return(p2);
}
