The GNU Scientific Library for Lisp (GSLL) allows you to use the GNU Scientific Library (GSL) from Common Lisp. This library provides a full range of common mathematical operations useful to scientific and engineering applications. The design of the GSLL interface is such that access to most of the GSL library is possible in a Lisp-natural way; the intent is that the user not be hampered by the restrictions of the C language in which GSL has been written. GSLL thus provides interactive use of GSL for getting quick answers, even for someone not intending to program in Lisp.
Topics include: polynomials, special functions, vectors and matrices, permutations, sorting, linear algebra including BLAS, eigensystems, fast Fourier transforms (FFT), quadrature, random numbers, quasi-random sequences, random distributions, statistics, histograms, N-tuples, Monte Carlo integration, simulated annealing, ordinary differential equations, interpolation, numerical integration, numerical differentiation, Chebyshev approximation, series acceleration, discrete Hankel transforms, root-finding, minimization, least-squares fitting, IEEE floating-point, discrete wavelet transforms, basis splines, physical constants. See missing-features.text on the status of some incomplete topics.
There are over 1500 examples available from within GSLL with the function examples. There is also a suite of over 4000 tests; many of the examples also serve as tests, and most others are ported from GSL's tests.
Download and Install
Use quicklisp and follow the instructions. You will need to make sure that the libraries and header files associated with GNU Scientific Library (GSL) and libffi are installed; your distribution may name these libgsl0-dev and libffi-dev. Once they are installed and you have loaded the quicklisp file:
To test your installation:
The result should look something like:
Unit Test Summary | 3997 assertions total | 3992 passed | 5 failed | 6 execution errors | 0 missing tests
You may see more failures; if you are not on a 64 bit platform you will see fewer assertions.
This software is distributed under the GPL ; see the file COPYING. There is absolutely no warranty.
The following techniques for using the API are advised:
Use the function (examples) without an argument to get a list of example categories. Then use the function with a category name as the argument to get a list of examples under that category, for example (examples 'higher-moments). The result will be a list of forms, each providing an example of usage in the relevant topic. If the GSL documentation provides an example, there will usually be the same or similar example provided in GSLL. Note: Some of the examples are intentionally designed to signal an error, because the examples also serve as a regression (unit) test suite for GSLL.
Some examples are not yet present in, or are too complicated for, the function #'examples. In this case, you need to look in the relevant source file; they are in either a separate file of examples, or at the end of the file of definitions. It is advisable to look at the examples first for calculations that require more complex setup (generally, the later chapters in the GSL manual).
GSLL has many functions that work on vectors (one-dimensional arrays) and matrices (two-dimensional arrays). Foreign arrays are defined and manipulated using the Antik which defines generic operations on array-like objects; see the Antik documentation for more information. GSLL supports all array element types that are supported by CFFI, the CL implementation, GSL, and the platform. This list is available in the variable grid:*array-element-types*.
Functions that are passed to GSL functions (known as callbacks in C) are specified with a function designator for the CL function, that is, either the function object itself or a symbol denoting the function. There is usually an option scalarsp for functions that take or return arrays that, if true, will send the user function the argument element by element, and expect the return values to be the individual elements.
There are a number of GSL objects other than arrays that can be created:
An instance may be created with a function whose name is "make-" followed by the class name, e.g. make-histogram. The arguments that the function takes depends on the class.
Some definitions are provided because of their usefulness, even though GSL doesn't have them.
invert-matrix finds the inverse of a matrix and uses GSL's LU decomposition functions.
IEEE floating point number analysis.
fft-frequency-vector returns a vector where the sample frequencies are contained. If you perform an FFT on a vector of a given size and :sample-size, this vector will contain the sample frequencies in order. If the :shifted keyword is T, then the frequencies are ordered in ascending order.
fft-shift returns a copy of a vector where the zero frequency has been shifted to the center; the frequency components will be sorted according to their frequency, in ascending order. Optionally, a :stride can be provided.
fft-inverse-shift performs the inverse action of fft-shift; the zero and positive frequency components are shifted to the beginning, so that the resulting vector is suitable for an inverse FFT. Optionally, a :stride can be provided.
GSLL is largely complete and usable, with functioning interfaces to most of GSL. Some functionality is not yet ported; see missing-features.text for more details. Known bugs are documented in status.text. Work is ongoing to both remedy those deficiencies and to simplify the user interface by changing more required arguments into optional or key arguments with useful default values. Typically, these arguments bind GSL objects and arrays used internally or for function return.
There is a mailing list for all aspects of this project, including bug reports. See also the archives. In addition, I am frequently on #lisp IRC channel as LiamH. For bug reports, please use the mailing list. The development site for GSLL has the git repository. If you have patch(es), please commit your changes and do:
git format-patch origin
This will produce one or more files whose names start with a four-digit number; please attach them all to your email.