FITPACK

FITPACK is a library purchased from Pleasant Valley Software, for curve and surface interpolation and fitting, using tension splines. It includes 80 user entries for one-, two-, and three-dimensional problems, and for special geometries, including spherical, polar, and toroidal coordinates. For two and three dimensions, the data must be must be on rectangular grids.

Recommendation: FITPACK is a good, general-purpose interpolation and fitting package. Use it unless your two- and three-dimensional data is irregular, or unless you can take advantage of another algorithm better suited to inherent properties of your data.

Documentation: usage documentation is available in SCD's FITPACK directory. Overview documentation is available in the README file in the FITPACK directory. Hardcopy documentation, "FITPACK User's Manual," can be purchased from the vendor, but only if the software is also purchased. Reference copies are available in Consulting Services, Room 17 of the Mesa Lab.
Source code: the official source code is available by purchase from the vendor. A small, public-domain version of the FITPACK source code is available from netlib's FITPACK directory. This version contains the most popular user entries for one and two dimensions only, and does not include any routines for special geometries.
NCAR users: the FITPACK binary library is available to NCAR computer users, for linking with Fortran programs, on some of SCD's compute-servers. See "SCD Computers, Products, and Libraries" for the names of those computers. If you have questions about linking the binary library on these NCAR systems, please see "Linking SCD's Local Fortran Math Libraries".

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