Maxima is a Common Lisp implementation of MIT's Macsyma system for
computer based algebra.
GOBLIN is a C++ class library focussed on graph optimization and network
programming problems. It deals with all of the standard graph optimization
problems discussed by textbooks and in courses on combinatorial optimization.
Today, GOBLIN provides strongly polynomial algorithms for the following graph
optimization problems:
- Shortest paths in graphs and digraphs with negative lengths.
- Negative cycles and minimum mean cycles.
- Strong and 2-connected components.
- Minimum spanning trees, arborescences and 1-trees.
- Maximum st-flows, feasible circulations and b-flows.
- Min-cost st-flows, b-flows and circulations.
- Assignment problems of any kind.
- 1-matchings, b-matchings, capacitated b-matchings, f-factors and
degree-constrained subgraphs.
- Directed and undirected Chinese postman problems, T-joins.
The library also includes methods for NP-hard problems, namely TSP, ATSP,
stable sets and graph colouring.
Mpexpr adds two new commands to Tcl, 'mpexpr' and 'mpformat'. Mpexpr works
much like Tcl's native 'expr', but does all calculations using an arbitrary
precision math package. Mpexpr numbers can be any number of digits, with any
decimal precision. Final precision is controlled by a Tcl variable
'mp_precision', which can be any reasonable integer, limiting only the
number of digits to the right of the decimal point.
Mpformat works much like Tcl's 'format', except it formats multiple
precision numbers in a variety of formats.
Mpexpr also includes most math functions provided by 'expr', as well
as several new functions. Mpexpr also supports Tcl variables and
nested evaluation, just like 'expr':
FreeMat is a free environment for rapid engineering and scientific
prototyping and data processing. It is similar to commercial systems
such as MATLAB from Mathworks, and IDL from Research Systems, but is
Open Source.
JEuclid is a complete MathML rendering solution, consisting of: a MathViewer
application, command line converters from MathML to other formats, an ant
task for autmated conversion, display components for AWT and Swing and a
component for Apache Cocoon.
The GraceTMPL classes provide an easy way to use existing grace-files as a
template to format any number of graphs in a predefined way and save them as
grace-files. This way you can apply the same graphical appearance to all of
your data. In case your preferences change, you just alter the template and
reformat your complete set of data within the shortest amount of time.
The capabilities of GraceTMPL include:
* The application using the GraceTMPL classes can define environment
variables for the sheet, each graph and each dataset. The variables can
be used in the template for dynamic string replacement. Even output
filenames can be templated using variable substitution.
* Datasets in the template file can be marked to be included in the
destination files for easy reference.
* Datasets can be tagged with arbitrary information strings to be
interpreted by the application using GraceTMPL. This way information can
be passed to the application on how to create the datasets and what kind
of information is intended by the template author.
* In case no template file is loaded by the application, GraceTMPL::Save
will output plain sets of data tables which can easily be imported by
XmGrace or other applications.
GNU Regression, Econometrics and Time-series Library
Features
- A wide variety of least-squares-based estimators (including two-stage
least squares).
- Easy, intuitive interface.
- Single commands to launch things like augmented Dickey-Fuller test, Chow
test for structural stability, Vector Autoregression.
- Reads own format ascii data files, Comma Separated Values files, BOX1
files, own format binary databases (allowing mixed data frequencies and
series lengths) and RATS 4 databases. Includes a US macro database and a
perl script to create a database off economagic.com. See also the gretl
data page.
- Output models as LaTeX files, in tabular or equation format (not very
flexible yet).
- Integrated scripting language: enter commands either via the gui or via
scripts.
- Command loop structure for Monte Carlo simulations.
- GUI controller for fine-tuning Gnuplot graphs.
- Link to GNU R for further data analysis.
Gri is a language for scientific graphics applications. By 'language' I mean
that it is a command-driven application, as opposed to a click/point
application. It is analogous to latex or tex, and shares the property that
extensive power is the reward for tolerating a modest learning curve. Gri
output is in industry-standard PostScript, suitable for incorporation in
documents prepared by various text processors. Gri can make x-y graphs,
contour-graphs, and image graphs. In addition to high-level capabilities, it
has enough low-level capabilities to allow users to achieve a high degree of
customization. Precise control is extended to all aspects of drawing, including
line-widths, colors, and fonts. Text includes a subset of the tex language, so
that it is easy to incorporate Greek letters and mathematical symbols in labels.
Current answer set solvers work on variable-free programs. Hence, a grounder is
needed that, given an input program with first-order variables, computes an
equivalent ground (variable-free) program. Gringo is such a grounder. Its
output can be processed further with clasp.
The Helsinki Finite-State Transducer toolkit is intended for processing
natural language morphologies. The toolkit is demonstrated by wide-coverage
implementations of a number of languages of varying morphological complexity.