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The JTS Topology Suite is an API of 2D spatial predicates and functions. It has the following design goals: * JTS conforms to the Simple Features Specification for SQL published by the Open GIS Consortium * JTS provides a complete, consistent, robust implementation of fundamental 2D spatial algorithms * JTS is fast enough for production use * JTS is written in 100% pure Java(TM) * JTS is open source (under the LGPL license)

KBruch is a small program to practice calculating with fractions and percentages. Different exercises are provided for this purpose and you can use the learning mode to practice with fractions. The program checks the user's input and gives feedback. FEATURES - Arithmetic excercise: in this exercise you have to solve a given fraction task. You have to enter the numerator and the denominator. This is the main exercise. - Comparison excercise: in this exercise you have to compare the size of two given fractions, using the symbols >, < or =. - Conversion excercise: in this exercise you have to convert a given number into a fraction. - Factorization excercise: in this exercise you have to factorize a given number into its prime factors. - Percentage excercise: in this exercise you have to calculate percentages.

Kig is an application for interactive geometry. FEATURES - Allows the students to interactively explore mathematical figures and concepts using the computer. - Serves as a WYSIWYG tool for drawing mathematical figures and including them in other documents.

KmPlot is a program to draw graphs, their integrals or derivatives. It supports different systems of coordinates like the cartesian or the polar coordinate system. The graphs can be colorized and the view is scalable, so that you are able to zoom to the level you need. Features: - Powerful mathematical parser. - Precise metric printing. - Different plot types: cartesian, parametric, polar, implicit, differential. - Highly configurable visual settings (plot line, axes, grid). - Export to bitmap format (BMP and PNG) and scalable vector graphics (SVG). - Save/load complete session in readable XML format. - Trace mode: cross hair following plot, coordinates shown in the status bar. - Supports zooming. - Ability to draw the 1st and 2nd derivative and the integral of a plot function. - Supports user defined constants and parameter values. - Various tools for plot functions: - Find minimum/maximum point. - Get y-value and draw the area between the function and the y-axis.

LTL is a C++ class template library for scientific computing which provides high performance via SSE3 floating point support for vector operations. Useful for array processing, image processing, FITS and ASCII I/O, and linear algebra (astronomical and scientific computing, in short). LTL provides dynamic arrays of up to 5-dimensions, subarrays and slicing, support for fixed size vectors and matrices including basic linear algebra operations, expression templates based evaluation, and I/O facilities for ascii and FITS format files. Users of the boost and blitz++ library may find the cross-pollination of these unique features to be fruitful.

KKTDirect implements an ordering method and accompanying factorization for the direct solution of saddle-point matrices (also known as KKT or equilibrium matrices). A simple constraint on ordering together with an assumption on the rank of parts of the matrix are sufficient to guarantee the existence of the LDL^T factorization, stability concerns aside. In fact, D may be taken to be a diagonal matrix with +/-1 along the diagonal, and be fully determined prior to factorization, giving rise to a "signed Cholesky" factorization. A modified minimum-degree-like algorithm which incorporates this constraint is used, along with a simple algorithm to modify an existing fill-reducing ordering to respect the constraint. While a stability analysis is lacking, numerical experiments indicate that this is generally sufficient to avoid the need for numerical pivoting during factorization, with clear possible benefits for performance. Note this is only alpha-quality proof-of-concept code: for example, out-of-memory errors are not handled gracefully, and the provided Minimum Degree routine is not yet competitive with other packages.

Matrix Math is software to quickly and easily compute functions of matrices of any size. It supports addition, subtraction, multiplication, inversion, division, and will support whatever else is necessary.

This program is an easy way to typeset mathematics. You can try it out at http://cauchy.math.missouri.edu/~stephen/cgi-bin/naturalmath.cgi Actually what it does is to convert text written in the Natural Math language into latex.

The package is intended for scientists and engineers who need to manipulate a variety of types of matrices using standard matrix operations. Emphasis is on the kind of operations needed in statistical calculations such as least squares, linear equation solve and eigenvalues.

Ngraph is prepared to plot 2-dimensional graph for students, scientists and engineers. The program reads numerical data from general ASCII text files, and plot to graph. ** Tips ** - This program support Kanji font. If you want to use it, please set environment variable LANG to ja_JP.EUC. (cf, under csh/tcsh) % setenv LANG ja_JP.EUC and you need.... - kinput2 - X True Type or X True Type Font server[best], or kanji18 and kanji26 fonts, these fonts are in below ports[better], - ja-ngraph-fonts (japanese/ngraph-fonts) - ja-kanji18 (japanese/kanji18) - ja-kanji26 (japanese/kanji26) or to change font name in Ngraph.ini as below[poor]. font_map=Mincho,1,-*-fixed-medium-r-normal--*-*-75-75-c-*-jisx0208.1983-0 font_map=Gothic,1,-*-fixed-medium-r-normal--*-*-75-75-c-*-jisx0208.1983-0 - You can get documentation in Japanese from below URL. ** Acknowledgements to this ports file ** Special thanks to: Satoshi Ishizaka <isizaka@msa.biglobe.ne.jp> Nobuhiro Yasutomi <nobu@rd.isac.co.jp>