jburkardt

DIFFER\ Finite Difference Approximations to Derivatives {#differ-finite-difference-approximations-to-derivatives align=”center”} ===============================================

---

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: {#licensing align=”center”}

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

Languages: {#languages align=”center”}

DIFFER 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: {#related-data-and-programs align=”center”}

DIVDIF, a C++ library which uses divided differences to compute the polynomial interpolant to a given set of data.

Reference: {#reference align=”center”}

1. Ake Bjorck, Victor Pereyra,\ Solution of Vandermonde Systems of Equations,\ Mathematics of Computation,\ Volume 24, Number 112, October 1970, pages 893-903.

Source Code: {#source-code align=”center”}

• differ.cpp, the source code.
• differ.hpp, the include file.

Examples and Tests: {#examples-and-tests align=”center”}

• differ_prb.cpp, a sample calling program.
• differ_prb_output.txt, the output file.

List of Routines: {#list-of-routines align=”center”}

• 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.
• I4_MAX returns the maximum of two I4’s.
• I4_MIN returns the minimum of two I4’s.
• I4_TO_STRING converts an I4 to a C++ string.
• INVERSE_ERROR determines the error in an inverse matrix.
• 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 new 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.