FEM1D_PMETHOD
P-Method Finite Element Method for 1D problem.

FEM1D_PMETHOD is a FORTRAN77 program which applies the p-method version of the finite element method to a two point boundary value problem in one spatial dimension.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

FEM1D_PMETHOD is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

FEM1D, a data directory which contains examples of 1D FEM files, three text files that describe a 1D finite element model;

FEM1D, a FORTRAN77 program which applies the finite element method to a linear two point boundary value problem in a 1D region.

FEM1D_ADAPTIVE, a FORTRAN77 program which applies the finite element method to a linear two point boundary value problem in a 1D region, using adaptive refinement to improve the solution.

FEM1D_BVP_LINEAR, a FORTRAN77 program which applies the finite element method, with piecewise linear elements, to a two point boundary value problem in one spatial dimension.

FEM1D_NONLINEAR, a FORTRAN77 program which applies the finite element method to a nonlinear two point boundary value problem in a 1D region.

FEM1D_PROJECT, a FORTRAN77 program which projects data into a finite element space, including the least squares approximation of data, or the projection of a finite element solution from one mesh to another.

FEM1D_SAMPLE, a FORTRAN77 program which samples a scalar or vector finite element function of one variable, defined by FEM files, returning interpolated values at the sample points.

Reference:

1. Hans Rudolf Schwarz,
   Finite Element Methods,
   Academic Press, 1988,
   ISBN: 0126330107,
   LC: TA347.F5.S3313..
2. Gilbert Strang, George Fix,
   An Analysis of the Finite Element Method,
   Cambridge, 1973,
   ISBN: 096140888X,
   LC: TA335.S77.
3. Olgierd Zienkiewicz,
   The Finite Element Method,
   Sixth Edition,
   Butterworth-Heinemann, 2005,
   ISBN: 0750663200,
   LC: TA640.2.Z54

Source Code:

• fem1d_pmethod.f, the source code.
• fem1d_pmethod.sh, commands to compile the source code.

Examples and tests:

• fem1d_pmethod_output.txt, the printed output from a run of the program.

List of Routines:

• MAIN is the main program of FEM1D_PMETHOD.
• ALPBET calculates ALPHA and BETA, the constants in the three
• EXACT compares the computed and exact solutions.
• FF evaluates the right hand side function F(X) at any point X.
• ORTHO test the basis functions for orthogonality.
• OUT prints out the computed solution.
• PHI evaluate the I-th basis function at the point X.
• PP returns the value of the coefficient function P(X) at a
• QUAD returns the abscissas and weights for gaussian quadrature
• QQ returns the value of the coefficient function Q(X) at a
• SOL solves for the coefficients that represent the solution
• TIMESTAMP prints out the current YMDHMS date as a timestamp.
• UEX returns the value of the exact solution at a point X.

You can go up one level to the FORTRAN77 source codes.