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"Linear Algebraic Equations"
Gauss-Seidel Iteration Methods

     Solution from the GAUSS-JACOBI iteration:

X[0] =
X[1] =
X[2] =

     Solution from the GAUSS-SEIDEL iteration:

X1[0] =
X1[1] =
X1[2] =

Matrix A: = { , , }, { , , }, { , , }

Vector b: = { , , }



[ Initial MatrixValues A: {5,1,2},{1,4,1},{2,1,3} ]
[ Initial VectorValues b: {8,6,6} ]

IMPLEMENTATION
Linear Algebraic Equations

The solution of linear equations is one of the most commonly used operations in numerical analysis as well as scientific and engineering applications.

Iteration Algorithm Creation

A set of linear equations can be written in a matrix form as:

A . x = b


Gauss-Jacobi Iteration Method

The Gauss-Jacobi iteration is one of the simplest iteration schemes. It uses the following formula:

xj(k+1) = 1/Aij(bi - ∑j≠i Aij xj(k))


Gauss-Seidel Iteration Method

The Gauss-Jacobi iteration is an improved version of the Gauss-Jacobi method. The iteration equation has the form:

xj(k+1) = 1/Aij(bi - ∑j≠i Aij xj(k)) - ∑j≠i Aij xj(k))


Testing Iteration Methods

In order to test the iteration methods as defined above, a new TestIterations() static method has been added and executed. Supporting code and methods are not shown.

A set of equations for the test has been defined where it has an analytic solution of (1, 1, 1). The results of the test show close approximations to the analytic solutions. The tolerance was set equal to 1.0E-4 and the maximum iterations to 10.


           static void TestIterations();
              {
                 ListBox1.Items.Clear();
                 ListBox2.Items.Clear();
                 ListBox3.Items.Clear();
                 ListBox4.Items.Clear();
                 ListBox5.Items.Clear();
                 ListBox6.Items.Clear();
                 LinearSystem ls = new LinearSystem();
                 MatrixR A = new MatrixR(new double[3, 3] { { t1, t2, t3 }, { t4, t5, t6 }, { t7, t8, t9 } });
                 VectorR b = new VectorR(new double[3] { t10, t11, t12 });
                 MatrixR A1 = A.Clone();
                 VectorR b1 = b.Clone();
                 VectorR x = ls.GaussJacobi(A, b, 10, 1.0e-4);
                 ListBox1.Items.Add(" " + x[0]);
                 ListBox2.Items.Add(" " + x[1]);
                 ListBox3.Items.Add(" " + x[1]);
                 VectorR x1 = ls.GaussSeidel(A, b, 10, 1.0e-4);
                 ListBox4.Items.Add(" " + x1[0]);
                 ListBox5.Items.Add(" " + x1[1]);
                 ListBox6.Items.Add(" " + x1[1]);
              }

An initial set of data points was defined for matrix A and vector b. The user can manipulate all values and try variations on the matrix and vector themselves.



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