robert collins
SAGE 4.0.1
Creating a viable free open source alternative to Magma, Maple, Mathematica, and Matlab. more>> Creating a viable free open source alternative to Magma, Maple, Mathematica, and Matlab.
Sage is free open source math software that supports research and teaching in algebra, geometry, number theory, cryptography, and related areas. Both the Sage development model and the technology in Sage itself are distinguished by an extremely strong emphasis on openness, community, cooperation, and collaboration: we are building the car, not reinventing the wheel.
General and Advanced Pure and Applied Mathematics
Use SAGE for studying a huge range of mathematics, including algebra, calculus, elementary to very advanced number theory, cryptography, numerical computation, commutative algebra, group theory, combinatorics, graph theory, and exact linear algebra.
Use an Open Source Alternative
By using SAGE you help to support a viable open source alternative to Magma, Maple, Mathematica, and MATLAB. SAGE includes many high-quality open source math packages.
Use Most Mathematics Software from Within SAGE
SAGE makes it easy for you to use most mathematics software together. SAGE includes interfaces to Magma, Maple, Mathematica, MATLAB, and MuPAD, and the free programs Axiom, GAP, GP/PARI, Macaulay2, Maxima, Octave, and Singular.
Use a Standard Programming Language
You work with SAGE using the highly regarded scripting language Python instead of an obscure language designed for a particular mathematics program. You can write programs that combine serious mathematics with anything else.
Create Notebooks with your Web Browser
Use SAGE from your web browser, which connects either to a program running on your computer, or a program running elsewhere. With the SAGE notebook you can create embedded graphics, beautifully typeset mathematical expressions, add and delete input, and start up and interrupt multiple calculations.
Be Curious
SAGE provides you with easy access to documentation and source code. Type plot? for help on the plot command and plot?? to see the source code. If X is anything, type X.[tab key] to see all commands that apply to X.
Enhancements
Algebra:
- Division over integers (Robert Bradshaw) -- A much simpler and faster algorithm for the divisors function over integers. The new optimized code is faster than a similar integer divisor function in the version of PARI/GP thats bundled with Sage 3.2.1, as well as outperforming a similar integer divisor function found in the version of Magma that Sage 3.2.1 interfaces with.
- Finite field operations (John Palmieri) -- A few methods for finite field elements including additive order, p-th power, and p-th root where p is the characteristic of the field.
Basic arithmetic:
- Polynomials over a field (Burcin Erocal) -- Improving the user interface of polynomial classes.
- Polynomial square roots (John Palmieri, Carl Witty) -- A method to test whether a polynomial is square over the field it is defined. If the polynomial is square, then the method has the option of returning a square root.
Build:
- Improve sage -upgrade (William Stein, Michael Abshoff) -- The Sage upgrade command can now take an optional URL from which it will pull all spkgs, and this URL can be a Sage install. The upgrade command lists packages that will be upgraded before upgrading them, and autodownloads a new version of any spkg that hasnt successfully been installed before upgrading it.
- Problematic CPU flags (William Stein, Michael Abshoff) -- Binary distributions of Sage for Linux (e.g. Ubuntu) may not work properly once installed. The following CPU flags are known to prevent Sage from running properly: sse, 3d, mmx, pni, and cmov.
Calculus:
- Gamma and factorial functions (Mike Hansen, Burcin Erocal, Wilfried Huss) -- Symbolic gamma and factorial functions.
- Update to sympy-0.6.3 (Ondrej Certik) -- Update to the latest upstream of SymPy (sympy-0.6.3), which is a Python library for symbolic mathematics. For more information about SymPy, please visit http://code.google.com/p/sympy/.
- Numerical trigonometry (Robert Bradshaw) -- Optimized floating point evaluation of trigonometric functions such as sine and cosine. For example, numerical calculation of sine via _fast_float_ is now twice as fast as math.sin.
- Floating point calculation (Robert Bradshaw) -- Changing the parsing code for numerical computation to use RDF, which is a better reflection of the underlying precision. For calculus expressions involving real numbers, redundant trailing zeros are removed.
Coercion:
- Coercion API (Robert Bradshaw) -- Some simplification of the coercion interface.
Combinatorics:
- Coding theory (David Joyner) -- Several changes in linear_codes.py which should speed up (and in some cases do:-) some coding theory computations considerably. It adds interfaces to Cython and C functions of Robert Miller, CJ Tjhal, and Jeffery Leon. Speed up of minimum_distance (for codes over GF(2) and GF(3)), the spectrum (=weight_distribution), and permutation_automorphism_group are expected and in most cases achieved. (Also a new function is_permutation_equivalent was added, which interfaces with Robert Millers double coset partition refinement code.)
- Incidence structures and block designs (David Joyner) -- Beginning of an incidence structure class and an implementation of some basic block design algorithms. A few functions require GAPs Design package (which is included in gap_packages-4.4.10_6.spkg) but calling GAP or GAPs Design was only done when the corresponding Sage functionality was missing. Robert Millers recent code on computing the automorphism group of a non-linear binary code was used to implement the automorphism group of a block design.
Testing:
- Added only_optional doctest option (William Stein) -- Added a new option sage -t -only_optional=component that allows one to run only the optional doctests that depend on a given component. Thus instead of much of the optional functionality of Sage being broken, it will now be much easier to automatically test it.
Schoolhouse 2.1
Schoolhouse - Track homework, reports & school projects more>>
You can sort your assignments by course, due date, and many other criteria. Color code your assignments by due date to give a visual cue of your upcoming deadline. Use groups and smart groups, export to iCal or your iPod, or email your assignment info to classmates.
Quickly contact your instructors with one click over email to get help with your assignments. The GPA and Finals calculators help to give you a heads up before important exams, and the ability to graph your course grades over any timeframe gives you the ability to predict your averages before the end of the term.
Schoolhouse helps any student, whether high school or college, to organize their assignments and get a hold on their school planning.
Enhancements:
- Added Feature: A week view has been added alongside the month view.
- Added Feature: Both calendar views now allow you to hide weekends.
- Added Feature: Courses can now be dragged and dropped between terms.
- Added Feature: Courses now support multiple occurrences and multiple instructors.
- Added Feature: Grading now allows you to ignore empty kinds instead of substituting a value.
- Bug Fix: Fixed a bug that would cause a crash when assigning courses.
- Bug Fix: Notebooks list now saves the last selected notebook between launches.
- Bug Fix: The course drop-down list no longer changes to "None" at random times.
- Bug Fix: Various other small bug fixes.
Robert Burch Illustration Widget 1.0
Robert Burch Illustration Widget - See Robert Burch?s newest images more>>
Robert Burch has been a conceptual illustrator for over a decade working with clients like American Airlines.
His work is fun, colorful, and thought provoking.
License:Freeware
RChess 2.2.3
RChess is a great chess game with many levels, wickied grins, and corny puns more>> RChess is a great chess game with many levels, wickied grins, and corny puns.
System 7.0 or later.
Make Chain 1.0
Make Chain - Multi-Column text box tool more>>
Completly freeware.
rename 1.0
rename - Rename files with a prefix or suffix more>>
Completly freeware for personal use.
Re-createFolders 1.0
Re-createFolders - Re-create a nested folder structure more>>
The starting point is the folder containing the droplet.
Completly freeware.
Bazaar 1.16 RC1 / 1.15.1
Free and open source application that adapts to the workflows you want to use Bazaar is a distributed version control system available under the GPL that reduces barriers to participation in your more>> Free and open source application that adapts to the workflows you want to use
Bazaar is a distributed version control system available under the GPL that reduces barriers to participation in your project.
Bazaar is designed to support Mac OS, GNU/Linux, UNIX, Windows. In summary, Bazaar gives you fast, distributed revision control that "Just Works", supporting renames of directories and files smoothly.
Bazaar is designed to maximise the level of community participation in your project.
Bazaar branches can be published on any web server, and uploaded over sftp, ftp, or rsync. If you want the fastest possible network performance, there is a smart server.
Bazaar supports flexible work models: centralized like cvs or svn, commit offline, enforced code review when desired, and automatic regression testing.
Decentralized revision control systems give people the ability to collaborate more efficiently over the internet using the bazaar development model and have many other advantages.
When you use Bazaar, you can commit to your own local branches of your favourite free software projects without needing special permission.
Main features:
Good performance:
- Bazaar status in a tree of 5,000 files takes just 0.5 seconds, so almost every open source project can get the advanced features of Bazaar without slowing down its developers. Bazaar is robust in the face of radical tree restructuring, saving you time when it comes to merging from your community.
Safe with your data:
- There have not been any data loss bugs in a Bazaar release in the past two years. Bazaar has a huge test suite that ensures that new file formats can be tested automatically. The development process follows best practice with code review of all core and community code landings.
Friendly:
- Bazaar "Just Works" (which is why the Ubuntu team chose it for their project). Bazaar has a natural feel, you can publish your code on any web server or use a custom server for performance. Bazaar has perfect support for renaming files AND directories, which means you can unleash your community and merge efficiently even from contributors who are radically restructuring the tree.
Free:
- Bazaar is available under the GPL v2 or later.
Easy to integrate:
- Bazaar is designed as a Python API with a plugin system, so it is easy to embed in your tools and projects and easy to extend or integrate with existing infrastructure. Whether you are managing your development, or keeping track of configuration files, or building a new content management system, Bazaar is a great choice if you like to work in Python.
System requirements:
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Enhancements
Compatibility Breaks:
- Display prompt on stderr (instead of stdout) when querying users so that the output of commands can be safely redirected. (Vincent Ladeuil, #376582)
New Features:
- A new repository format 2a has been added. This is a beta release of the the brisbane-core (aka group-compress) project. This format now suitable for wider testing by advanced users willing to deal with some bugs. We would appreciate test reports, either positive or negative. Format 2a is substantially smaller and faster for many operations on many trees. This format or an updated version will become the default in bzr 2.0.
- This is a rich-root format, so this repository format can be used with bzr-svn. Bazaar branches in previous non-rich-root formats can be converted (including by merge, push and pull) to format 2a, but not vice versa. We recommend upgrading previous development formats to 2a.
- Upgrading to this format can take considerable time because it expands and more concisely repacks the full history.
- If you use stacked branches, you must upgrade the stacked branches before the stacked-on branches. (See )
- --development7-rich-root is a new dev format, similar to --dev6 but using a Revision serializer using bencode rather than XML. (Jelmer Vernooij, John Arbash Meinel)
- mail_client=claws now supports --body (and message body hooks). Also uses configured from address. (Barry Warsaw)
Improvements:
- --development6-rich-root can now stack. (Modulo some smart-server bugs with stacking and non default formats.) (John Arbash Meinel, #373455)
- --development6-rich-root delays generating a delta index for the first object inserted into a group. This has a beneficial impact on bzr commit since each committed texts goes to its own group. For committing a 90MB file, it drops peak memory by about 200MB, and speeds up commit from 7s => 4s. (John Arbash Meinel)
- Numerous operations are now faster for huge projects, i.e. those with a large number of files and/or a large number of revisions, particularly when the latest development format is used. These operations (and improvements on OpenOffice.org) include: branch in a shared repository (2X faster), branch --no-tree (100X faster), diff (2X faster), tags (70X faster) (Ian Clatworthy)
- Pyrex version of bencode support. This provides optimized support for both encoding and decoding, and is now found at bzrlib.bencode. bzrlib.utils.bencode is now deprecated. (Alexander Belchenko, Jelmer Vernooij, John Arbash Meinel)
Bug Fixes:
- Bazaar can now pass attachment files to the mutt email client. (Edwin Grubbs, #384158)
- Better message in bzr add output suggesting using bzr ignored to see which files can also be added. (Jason Spashett, #76616)
- bzr pull -r 123 from a stacked branch on a smart server no longer fails. Also, the Branch.revision_history() API now works in the same situation. (Andrew Bennetts, #380314)
- bzr serve on Windows no longer displays a traceback simply because a TCP client disconnected. (Andrew Bennetts)
- Clarify the rules for locking and fallback repositories. Fix bugs in how RemoteRepository was handling fallbacks along with the _real_repository. (Andrew Bennetts, John Arbash Meinel, #375496)
- Fix a small bug with fetching revisions w/ ghosts into a new stacked branch. Not often triggered, because it required ghosts to be part of the fetched revisions, not in the stacked-on ancestry. (John Arbash Meinel)
- Fix status and commit to work with content filtered trees, addressing numerous bad bugs with line-ending support. (Ian Clatworthy, #362030)
- Fix problem of "directory not empty" when contending for a lock over sftp. (Martin Pool, #340352)
- Fix rule handling so that eol is optional, not mandatory. (Ian Clatworthy, #379370)
- Pushing a new stacked branch to a 1.15 smart server was broken due to a bug in the BzrDirFormat.initialize_ex smart verb. This is fixed in 1.16, but required changes to the network protocol, so the BzrDirFormat.initialize_ex verb has been removed and replaced with a corrected BzrDirFormat.initialize_ex_1.16 verb. 1.15 clients will still work with a 1.16 server as they will fallback to slower (and bug-free) methods. (Jonathan Lange, Robert Collins, Andrew Bennetts, #385132)
- Reconcile can now deal with text revisions that originated in revisions that are ghosts. (Jelmer Vernooij, #336749)
- Support cloning of branches with ghosts in the left hand side history. (Jelmer Vernooij, #248540)
- The bzr diff now catches OSError from osutils.rmtree and logs a helpful message to the trace file, unless the temp directory really was removed (which would be very strange). Since the diff operation has succeeded from the users perspective, no output is written to stderr or stdout. (Maritza Mendez, #363837)
- Translate errors received from a smart server in response to a BzrDirFormat.initialize or BzrDirFormat.initialize_ex request. This was causing tracebacks even for mundane errors like PermissionDenied. (Andrew Bennetts, #381329)
Documentation:
- Added directory structure and started translation of docs in Russian. (Alexey Shtokalo, Alexander Iljin, Alexander Belchenko, Dmitry Vasiliev, Volodymyr Kotulskyi)
API Changes:
- Added osutils.parent_directories(). (Ian Clatworthy)
- bzrlib.progress.ProgressBar, ChildProgress, DotsProgressBar, TTYProgressBar and child_progress are now deprecated; use ui_factory.nested_progress_bar instead. (Martin Pool)
- graph.StackedParentsProvider is now a public API, replacing graph._StackedParentsProvider. The api is now considered stable and ready for external users. (Gary van der Merwe)
- bzrlib.user_encoding is deprecated in favor of get_user_encoding. (Alexander Belchenko)
- TreeTransformBase no longer assumes that limbo is provided via disk. DiskTreeTransform now provides disk functionality. (Aaron Bentley)
Internals:
- Remove weave.py script for accessing internals of old weave-format repositories. (Martin Pool)
Testing:
- The number of cores is now correctly detected on OSX. (John Szakmeister)
- The number of cores is also detected on Solaris and win32. (Vincent Ladeuil)
- The number of cores is also detected on FreeBSD. (Matthew Fuller)
Showtimes Helper 1.0
GUI to download local movie showtimes to a Palm. more>>
ChangeCalendarEntries 1.0
ChangeCalendarEntries - Changes Calendar event data between specified dates more>>
Completly freeware for personal use.
TIXClock widget 1.2
TIXClock widget - Yet another clock widget more>>
Completly freeware for personal use.
MessageReport 1.0
MessageReport - Writes a message report to a Note more>>
Macfreak RSS Widget 0.2
Macfreak RSS Widget shows the 20 latest news items on macfreak.nl more>>

teleport 1.0
Lets you use a single mouse and keyboard to control several Macs. more>>
Simply reach an edge of your screen, and your mouse teleports to your nearby Mac, which also becomes controlled by your keyboard. The pasteboard can be synchronized, and you can even drag & drop files between your Macs.
It works on Tiger and Leopard, and is available in English, French, Italian and Spanish.
Ask The Web 1.2b2
Ask The Web is a special kind of web browser which is specialized for dictionary servers, comparable to Apple Sherlock for Search Servers more>> Ask The Web is a special kind of web browser which is specialized for dictionary servers, comparable to Apple Sherlock for Search Servers.
MacOS 8.0 or later.