DIFFER
Finite Difference Approximations to Derivatives
DIFFER
is a C library which
determines the finite difference coefficients necessary in order to
combine function values at known locations to compute an approximation
of given accuracy to a derivative of a given order.
Licensing:
The computer code and data files made available on this
web page are distributed under
the GNU LGPL license.
Languages:
DIFFER is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version.
Related Data and Programs:
DIVDIF,
a C library which
uses divided differences to compute the polynomial interpolant
to a given set of data.
Reference:

Ake Bjorck, Victor Pereyra,
Solution of Vandermonde Systems of Equations,
Mathematics of Computation,
Volume 24, Number 112, October 1970, pages 893903.
Source Code:
Examples and Tests:
List of Routines:

DIFFER_BACKWARD computes backward difference coefficients.

DIFFER_CENTRAL computes central difference coefficients.

DIFFER_FORWARD computes forward difference coefficients.

DIFFER_INVERSE returns the inverse of the DIFFER matrix.

DIFFER_MATRIX computes the stencil matrix from the stencil vector.

DIFFER_SOLVE solves for finite difference coefficients.

DIFFER_STENCIL computes finite difference coefficients.

INVERSE_ERROR determines the error in an inverse matrix.

I4_MAX returns the maximum of two I4's.

I4_MIN returns the smaller of two I4's.

R8_ABS returns the absolute value of an R8.

R8_FACTORIAL computes the factorial of N.

R8MAT_FS_NEW factors and solves a system with one right hand side.

R8MAT_MM_NEW multiplies two matrices.

R8MAT_MV_NEW multiplies a matrix times a vector.

R8MAT_NORM_FRO returns the Frobenius norm of an R8MAT.

R8MAT_PRINT prints an R8MAT.

R8MAT_PRINT_SOME prints some of an R8MAT.

R8MAT_SUB_NEW computes C = A  B.

R8VEC_PRINT prints an R8VEC.

R8VEC_UNIFORM_01_NEW returns a unit pseudorandom R8VEC.

R8VEC2_PRINT prints an R8VEC2.

R8VM_SL solves a R8VM system.

R8VM_SL_NEW solves a R8VM system.

TIMESTAMP prints the current YMDHMS date as a time stamp.
You can go up one level to
the C source codes.
Last revised on 03 November 2013.