FEM1D_LAGRANGE is a FORTRAN90 library which sets up the matrices and vectors associated with the finite element method (FEM) solution of a boundary value problem (BVP) -u''+u=f(x), using Lagrange basis polynomials.
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
FEM1D_LAGRANGE is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
FEM1D, a FORTRAN90 program which applies the finite element method (FEM) to a 1D linear two point boundary value problem (BVP).
LAGRANGE_INTERP_1D, a FORTRAN90 library which defines and evaluates the Lagrange polynomial p(x) which interpolates a set of data, so that p(x(i)) = y(i).
You can go up one level to the FORTRAN90 source codes.