**Some codes of the finite difference methods for PDEs.**

- The Backward Difference Method
**c code**,**fortran code**

- The Crank-Nicolson Method
**c code**,**fortran code**

**Some codes of solving the linear sustem AX = b.**

- The Gaussian Eilimination Method
**c code**,**fortran code**

- The Gaussian Eilimination with Partial Pivoting
**c code**,**fortran code**

- The Choleski's Method (LL^t)
**c code**,**fortran code**

- The Crout's Method
**c code**,**fortran code**

- The Jacobi Interative
**c code**,**fortran code**

- The Gauss-Seidel Interative
**c code**,**fortran code**

- The SOR Method
**c code**,**fortran code**