Our writers talk back

Some of the previous contributors to the Green Room respond to readers' questions and comments.

news.bbc.co.uk

A deep-sea fish caught in the Pacific has mirrors for eyes

A deep-sea fish caught in the Pacific has eyes which use mirrors as well as lenses, scientists discover.

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Holes give edge to new armour

Scientists from the UK Ministry of Defence (MoD) have devised ultra-hard vehicle armour to protect military personnel.

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Canadians claim South Pole record

A trio of Canadians claim a new record for the fastest trek across Antarctica to the South Pole.

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Feilden's blog

Ground-breaking new technique in stem cell science

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Tech fair offers greener vision

Analysts at the Consumer Electronics Show say green credentials of tech products will become critical to success.

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Animal matters

Scotland's debate over tests on primates

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Mummy of female pharaoh uncovered

Egyptologists find remains of a mummy thought to belong to a queen who ruled 4,300 years ago, Egypt's antiquities chief announced.

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Earth Watch

Why it is hard to predict sudden environmental crises

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Eat it or lose it - why centuries of crop diversity are at risk

Centuries of crop diversity are at risk of being lost forever as farmers turn to just a few modern, high yielding varieties.

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Heat may spark world food crisis

Half the world's population could face food crisis by 2100 as soaring temperatures cripple staple crops, scientists warn.

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Poetry or science?

Is romantic love just a chemical cocktail?

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Venomous mammal caught on camera

Rare footage of one of the world's most strange and elusive mammals is captured by scientists.

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Panda bites his third tourist in two years at Beijing zoo

A panda at Beijing zoo bites a man for the third time in two years.

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Zimbabwe troops 'eat elephants'

A Zimbabwean wildlife campaigner tells the BBC that soldiers are being given elephant meat to eat, as the economic crisis deepens.

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'Wolfman' returns

Explorer Jim McNeill tracks down Arctic wolves

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Body repair 'could be ramped up'

A combination of drugs could trick the body into sending its repair mechanisms into overdrive, say scientists.

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Everest trip helps critically ill

Blood oxygen levels recorded on a trip by medics to Everest could help the treatment of critically ill patients.

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China alert over bird flu death

Chinese authorities shut down and clean poultry markets in Hebei province, after the first human death in nearly a year.

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US vows 'huge' marine protection

The US is to establish "the largest area of protected sea in the world", banning fishing and mining, around its Pacific islands.

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Baby Jupiter's huge weight gain

The planet Jupiter must have gained mass fast during its infancy, according to astronomers.

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Beagle hunter

On a mission to find the most famous ship of science

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Black holes 'preceded galaxies'

Astronomers believe they have solved a cosmic chicken-and-egg question: what came first - black holes or galaxies?

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First flight of algae-fuelled jet

Continental Airlines is the latest to test fly a jet biofuel, this time with a product derived partially from algae.

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Mosquitoes make sweet love music

Sexy songs sung by mosquitoes in courtship could be key to curbing the spread of dengue fever, say scientists.

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 Science > Math > Numerical Analysis > Software

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Science > Math > Numerical Analysis > Software

Software:

Addix.Spline

A comprehensive spline curve function library for creating and evaluating splines in Excel, VB and VBA. Free download of evaluation copy.

http://www.addix.com/products/spline/overview.html

Astronomical Image Processing System

A software package for calibration, data analysis, image display, plotting, etcetera on astronomical data.

http://www.cv.nrao.edu/aips/

Astronomy and Numerical Source Codes

Astronomical computations and mathematical functions source programs in C. Home page of the Cephes Mathematical Library.

http://www.moshier.net/

Graand

Free Classified Ads Portal

www.graand.com

Boundary Element Method

Resources: Acoustics, Laplace and Helmholtz Problems. Book, manuals, Fortran software (Free and to purchase).

http://www.boundary-element-method.com/

CSE - LANCELOT

A standard fortran 77 package for solving large-scale nonlinearly constrained optimization problems. Free download by FTP.

http://www.cse.clrc.ac.uk/nag/lancelot/lancelot.shtml

Decision Tree for Optimization Software

Ready to use solutions for optimization problems, or at least a way to build such a solution using work done by others. Where possible, public domain software is listed.

http://plato.la.asu.edu/guide.html

Discrete Fourier Series Transform

Basic presentation of the discrete Fourier series transform. Explanations and formules. Raw source code to calculate numerical Fourier transforms.

http://www.4p8.com/eric.brasseur/fouren.html

Easy-Fit

Used to identify parameters in explicit model functions, dynamic systems of equations (steady-state), Laplace transforms, ordinary differential equations, differential algebraic equations and one-dimensional partial differential equations. Proceeding from given experimental data. For example, observation times and measurements, the minimum least squares distances of measured data from a fitting criterion are computed, that may depend on the solution of the dynamic system.

http://www.uni-bayreuth.de/departments/math/~kschittkowski/easy_fit.htm

FreeFEM

Free general PDE solver driven by a user friendly language. Both a 2D and a 3D version are available. MacOS, Windows.

http://www.freefem.org/

Freely Available Software for the Solution of Linear Algebra Problems

Software for high-performance computers available in source form for problems in numerical linear algebra, specifically dense, sparse direct and iterative systems and sparse iterative eigenvalue problems.

http://www.netlib.org/utk/people/JackDongarra/la-sw.html

Genetic Optimization Algorithm

Freeware used to solve optimization problems with several real and binary parameters and non linear objective functions and constraints. Includes illustration of program and links to the author's other webpages.

http://www.geocities.com/geneticoptimization/

GNU Octave

Free numerical analysis and visualization environment similar to Matlab.

http://www.octave.org/

GNU Octave Repository

Central location for custom scripts, functions and extensions to GNU Octave.

http://octave.sourceforge.net/

HSL Archive

HSL (formerly the Harwell Subroutine Library) is a collection of ISO Fortran codes for large scale scientific computation, written by members of the Numerical Analysis Group and other experts. Free download by FTP.

http://hsl.rl.ac.uk/archive/hslarchive.html

Jean-Pierre Moreau's Home Page

This private website is entirely dedicated to sources in numerical analysis in four languages: Basic, C++, Fortran and Pascal in Microsoft Windows environment.

http://pagesperso-orange.fr/jean-pierre.moreau/

MAI Information Technology

Numerical, statistical, and signal processing subroutine libraries optimised for OS/2 platforms.

http://www.marschall-acoustics-instruments.com.au/MAI-IT

MEDEA: Matrix Exponential Differential Equation Algorithm

Algorithm for the numerical integration of systems of ordinary differential equations arising in chemical problems. C ocde, free to use.

http://www.caspur.it/~castri/MEDEA/index.htm

METIS: Serial Graph/Mesh Partitioning & Sparse Matrix Ordering

Graph, mesh, and hypergraph partitioning software. Free download, portable on most Unix systems that have an ANSI C compiler (e.g. GNU C).

http://www-users.cs.umn.edu/~karypis/metis/metis/

MIT Aero/Astro Scientific Visualization

Visualization software developed at MIT.

http://raphael.mit.edu/haimes.html

Newmat C++ Matrix Manipulation Library

For the manipulation of matrices in the C++ language, oriented towards science and engineering applications.

http://www.robertnz.net/nm_intro.htm

Numerical Methods

Notes and Fortran code on topics including: Finite elements, finite differences, boundary elements, integral equation methods, optimisation,linear systems, numerical integration, ODEs.

http://www.numerical-methods.com/

Object-oriented Finite Element / Numerical Methods in C++

VectorSpace C++ Library for advanced numerical computation such as constrained optimization, variational methods, and computational mechanics.

http://www.vector-space.com/

Ordinary Differential Equation System Solver

A Java-Applet/Application for solving ODE systems.

http://damato.light-speed.de/dessolver/

Reactor Simulation Editor, Introduction with Examples

The Reactor Simulation Editor (rsedit) is a software package designed to solve finite difference equations in a simplified way. The tool kit includes: a geometry editor, data structure editors, equation editor and an HTML output library.

http://www.cas.mcmaster.ca/~gilbert/rse_intro/

Scientific Computing

Software and Algorithms for linear and nonlinear inverse Problems: Computerized tomography, wavelet applications, statical computations, multi parameter fit and more

http://www.isca-louis.com/

SLEIGN2

FORTRAN programs for solving Sturm--Liouville equations.

http://www.math.niu.edu/~zettl/SL2/

Software

Software for complex three dimensional surfaces.

http://www.geocities.com/mdcaero/index2.html

TeLa

The tensor language. Scientific computing language and environment.

http://www.geo.fmi.fi/prog/tela.html

Test Set for Initial Value Problem Solvers

Test problems, experimental results from a number of proven solvers, solvers, subroutines providing a common interface and links for Initial Value Problems for ODEs, DAEs and IDEs.

http://pitagora.dm.uniba.it/~testset

WNLIB C Subroutine Library

Will Naylor's free, unrestricted ANSI-C subroutine library including numerical routines such as conjugate-gradient and conjugate-directions, simplex method, transportation problem, fast-Fourier transform, matrix and vector operations.

http://www.willnaylor.com/wnlib.html

XRC - Exact Reals in C

An implementation of lazy exact real arithmetic in C by Keith Briggs.

http://keithbriggs.info/xrc.html