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GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. There is no limit to the precision except the ones implied by the available memory in the machine GMP runs on. GMP has a rich set of functions, and the functions have a regular interface. GMP is designed to be as fast as possible, both for small operands and for huge operands. The speed is achieved by using fullwords as the basic arithmetic type, by using fast algorithms, with carefully optimized assembly code for the most common inner loops for a lot of CPUs, and by a general emphasis on speed (instead of simplicity or elegance). GMP is believed to be faster than any other similar library. The advantage for GMP increases with the operand sizes for certain operations, since GMP in many cases has asymptotically faster algorithms.

GLgraph visualize mathematical functions. It can handle 3 unknowns (x,z,t) and can produce a 4D function with 3 space and 1 time dimension.

GraphThing is a tool that allows you to create, manipulate and study graphs. These "graphs" are mathematical objects that describe relationships between sets; they are not 2D plots, charts, or anything similar to that.

Gnuplot is a portable multi-platform command-line driven graphing utility. It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. This port installs extra files for TeX terminals (latex, epslatex, Tikz, etc).

Gnuplot is a portable multi-platform command-line driven graphing utility. It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. Gnuplot supports many types of plots in either 2D or 3D. It can draw using lines, points, boxes, contours, vector fields, surfaces, and various associated text. It also supports various specialized plot types. Gnuplot supports many different types of output: interactive screen terminals (with mouse and hotkey input), direct output to pen plotters or modern printers, and output to many file formats (eps, emf, fig, jpeg, LaTeX, pdf, png, postscript, ...). Gnuplot is easily extensible to include new output modes. Recent additions include interactive terminals based on wxWidgets (usable on multiple platforms), and Qt. Mouseable plots embedded in web pages can be generated using the svg or HTML5 canvas terminal drivers.

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.