This package includes a complete port of the QUADPACK Fortran codes to C. Unlike ports created by translators, this port reimplements the algorithms to take advantage of C progralm structure and dynamic memory. Every effort has been made to leave the low level code intact, except where some opportunity to convert from unstructured blocks to more structured form was taken.
Some changes to the calling conventions for various routines have also been made. In particular, the low level integrators, such as 'dqk??.c', are treated as functions returning a value. In the original code, these integrators are subroutines passing the result back through a parameter.
QUADPACK is well documented in the publication, ``QUADPACK, A Subroutine Package for Automatic Integration,'' by R. Piessens, et al., Springer-Verlag, 1980.
This port was initially done by C. Bond (http://www.crbond.com/) and this is a repackaging of the initial code with some minor changes.
The code has no external dependency. It only depends on the standard C library.
conda install -c https://conda.anaconda.org/edisongustavo cquadpack
CMake is required.
It is recommended to use out-of-source builds builds. For that, create the build directory and run CMake on it:
mkdir build
cd build
cmake ..
Open the Visual Studio command prompt and run the above commands. A solution cquadpack.sln will be generated, open it with Visual Studio and compile it.
The files are distributed among several directories for convenience in identification. For application development, a different directory structure would be necessary. Feel free to move the files according to your requirements.
The complete set of source and header files are in the directory: src/.
If you have access to the QUADPACK documentation, you will be able to match files in this directory to the original FORTRAN files.
Some test programs which exercise most of the CQUADPACK routines are included. They are in the directore: test/.
If you plan to use CQUADPACK for more than one application, it would be better to compile all the source files into a library, and just add the library to your project.
These include a programs to compute elliptic integrals and demonstrate double integrals.
The author makes no warranty about the correctness of any translation. This is just as well, because there is no guarantee that the original codes were error free in the first place. Every effort has been made to assure that the programs are functional and that they perform as expected.