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>