f

#### Free math' app' threatens commercial math' app's

For Mac math' buffs, a new FREE open-source math' app'
called SAGE will be available for free shortly, which
claims to beat expensive commercial software
like Mathematica which costs $2,500 Some team of math' experts at University of Washington are developing the app' Supposedly SAGE has already won awards in open competition at some world-wide math' conference. <http://uwnews.washington.edu/ni/article.asp?articleID=38459> Mark-   0 noneof (1053) 12/8/2007 10:29:21 AM comp.sys.mac.system 33446 articles. 2 followers. jfmezei.spamnot (9455) is leader. 6 Replies 1111 Views Similar Articles [PageSpeed] 53 In article <noneof-AC775C.02292008122007@earthlink.vsrv-sjc.supernews.net>, Mark Conrad <noneof@urbusiness.invalid> wrote: > For Mac math' buffs, a new FREE open-source math' app' > called SAGE will be available for free shortly, which > claims to beat expensive commercial software > like Mathematica which costs$2,500
>
> Some team of math' experts at University of Washington are
> developing the app'
>
> Supposedly SAGE has already won awards in open competition at
> some world-wide math' conference.
>
> <http://uwnews.washington.edu/ni/article.asp?articleID=38459>
>
>
> Mark-

Thank you for the pointer!

Marc

--
remove bye and from mercial to get valid e-mail
<http://www.heusser.com>

 0
12/8/2007 11:37:08 AM
Welcome to the "free" market.

 0
timmcn (2339)
12/8/2007 5:15:31 PM
In article

> For Mac math' buffs, a new FREE open-source math' app'
> called SAGE will be available for free shortly, which
> claims to beat expensive commercial software
> like Mathematica which costs $2,500 > > Some team of math' experts at University of Washington are > developing the app' > > Supposedly SAGE has already won awards in open competition at > some world-wide math' conference. > > <http://uwnews.washington.edu/ni/article.asp?articleID=38459> I think that it has quite a ways to go before it becomes a threat to anything. Here is the readme file: VERY QUICK INSTRUCTIONS TO BUILD FROM SOURCE: 1. Make sure you have the dependencies. LINUX (install these using your package manager): gcc, g++, make, m4, perl, ranlib, and tar. OSX: XCode. WARNING: If "gcc -v" outputs 4.0.0, you *must* upgrade XCode (free from Apple), since that version of GCC is very broken. NOTE: On some operating systems it might be necessary to install gas/as, gld/ld, gnm/nm, but on most these are automatically installed when you install the programs listed above. 2. Extract the tarball: tar xvf sage-*.tar 3. cd into the sage directory and type make: cd sage-* make That's it! Everything is automatic and non-interactive. NOTE: On Linux if you get this error message: " restore segment prot after reloc: Permission denied " the problem is probably related to SE Linux: http://www.ittvis.com/services/techtip.asp?ttid=3092 ---------------------------------------------------------------- SAGE: Software for Algebra and Geometry Experimentation Copyright (C) 2006, 2007 William Stein <wstein@gmail.com> Distributed under the terms of the GNU General Public License (GPL) http://www.sagemath.org If you have questions, do not hesitate to email wstein@gmail.com or (even better!) sage-support@googlegroups.com: http://groups.google.com/group/sage-support AUTHORS: There are well over 50 people who have contributed code to SAGE. Please see one of the websites above for a list. In many cases documentation for modules and functions list the authors. OFFICIALLY SUPPORTED PLATFORMS: Building of SAGE from source is regularly tested on (minimal installs of) the following platforms: PROCESSOR OPERATING SYSTEM x86 32-bit Linux -- Debian, Ubuntu, RHEL5, Fedora Core, CentOS, Suse, Mandriva x86_64 64-bit Linux -- Debian ia64 itanium2 64-bit Linux x86 Apple Mac OS X 10.4.x, 10.5 ppc Apple Mac OS X 10.4.x Use SAGE on Microsoft Windows via VMware. UNSUPPORTED, BUT HIGH PRIORITY TO SUPPORT SOON: sparc Solaris 9, Solaris 10 x86_64 Solaris 10 IMPLEMENTATION: SAGE has significant components written in the following languages: C/C++, Python, Lisp, and Fortran. Lisp and Python are built as part of SAGE, and Fortran (g95) is included (x86 Linux and OS X only), so you do not need them in order to build SAGE. MORE DETAILED INSTRUCTIONS TO BUILD FROM SOURCE: (See the installation guide for more details.) 1. Make sure you have about 700MB free disk space. 2. Linux: Install gcc, g++, m4, ranlib, and make. The build should work fine on SUSE, FC, Ubuntu, etc. If it doesn't, we want to know! OS X: Make sure you have XCode version >= 2.4, i.e., gcc -v should output build >= 5363. If you don't, go to http://developer.apple.com/ sign up, and download the free XCode package. Only OS X >= 10.4 is supported. Windows: Download and install VMware, install linux into it, etc. 3. Extract the sage source tarball, cd into a directory with no spaces in it. If you have a machine with n processors, say, type export MAKE="make -j4" To start the build type make 4. Wait about 1 to 8 hours, depending on your computer. SOME ACTUAL REAL BUILD TIMES (for SAGE-2.7.1): * 1.8Ghz Linux Opteron 64-bit 16-core SMP machine: 67 minutes * G5: 102 minutes * Core 2 Duo: 67 minutes * Core Duo: 75 minutes * 1.5 Ghz G4 (rev 1.2): 167 minutes 5. Type ./sage to try it out. 6. OPTIONAL: Start sage and run the command install_scripts("/usr/local/bin/") # change /usr/local/bin/ Type "install_scripts?" in SAGE for more details about what this command does. 7. OPTIONAL: Type "make test" to test all examples in the documentation (over 12000 lines of input!) -- this takes from 15 minutes to an hour. Don't get too disturbed if there are 2-3 failures, but always feel free to e-mail the section of test.log that contains errors to wstein@gmail.com and/or sage-support@googlegroups.com: http://groups.google.com/group/sage-support If there are numerous failures, there was a serious problem with your build. 8. OPTIONAL: Documentation: If you want to (try to) build the documentation, change into SAGE_ROOT/devel/doc and type "make html" or "make pdf". This requires having latex and latex2html installed, and there are some issues with the \url macro. Note that the latex docs come *pre-built* with SAGE, and are in SAGE_ROOT/doc/. 9. OPTIONAL: GAP -- It is highly recommended that you install the optional GAP databases by typing ./sage -optional then installing (with ./sage -i) the package whose name begins with database_gap. This will download the package from sage.math.washington.edu and install it. While you're at it you might install other databases of interest to you. 10. OPTIONAL: It is highly recommended that you have both latex and the imagemagick tools (e.g., the "convert" command) installed since some plotting functionality uses it. SUPPORTED COMPILERS: * SAGE builds with GCC >= 3.x and GCC >= 4.1.x. * SAGE will not build with gcc 2.9.x. * WARNING: Don't build with GCC 4.0.0, which is "buggy as a Florida swamp in August". * I don't know if SAGE has ever been built with a non-GCC compiler. SOLARIS: It is reportedly possible, but not recommended yet (see below). A fully supported port is planned. RUNNING SAGE: 1. Try running sage: ./sage 2. Try running an example SAGE script: ./sage example.sage RELOCATION (OS X and Windows): You *should* be able to move the sage-x.y.z directory anywhere you want. If you copy the sage script or put a symlink to it, you should modify the script to reflect this (as instructed in the top of the script). It is best if the path to SAGE does not have any spaces in it. If you find anything that doesn't work correctly after you moved the directory, please let me know (wstein@gmail.com)! Making software "movable" is *very* tricky. REDISTRIBUTION: Your local SAGE install is exactly the same as any "developer" install. You can make changes to documentation, source, etc., and very easily package up the complete results for redistribution just like we do. 1. You can make your own source tarball (sage-x.y.z.tar) of SAGE by typing "sage -sdist x.y.z", where the version is whatever you want. The result is placed in SAGE_ROOT/dist. 2. You can make a binary distribution with the packages you've installed included by typing "sage -bdist x.y.z". The result is placed in the SAGE_ROOT/dist directory. CHANGES TO INCLUDED SOFTWARE: All software included with SAGE is copyright by the respective authors and released under an open source license that is GPL compatible. See the file COPYING.txt for more details. (Note -- jsMath is licensed under the Apache license; Apache claim their license is GPL compatible, but Stallman disagrees.) After building SAGE, see the directories SAGE_ROOT/spkg/build/package-name/ for a file SAGE.txt that details all changes made to the given package for inclusion with SAGE. The inclusion of such a file detailing changes is specifically required by some of the packages included with SAGE (e.g., for GAP). (These directories are deleted when you type "make clean".) ---- KNOWN BUILD PROBLEMS: * On OS X PowerPC, gmp miscompiles the first time. Do ./sage -f spkg/standard/gmp-the_correct_filename.spkg to build it again. Then type rm -rf devel/sage-main followed by "make" and the build should complete. SOLARIS: It has been possible to do a complete successful install of SAGE on Solaris with gcc, though possibly not in a completely automated manner. This section contains some potentially helpful remarks. * You can skip installing certain packages by typing, e.g., touch spkg/installed/clisp-2.37 This way you can use your own system-wide version of some SAGE-related software, which is in some cases easier to obtain. * Every component EXCEPT SINGULAR of version 0.9.21 of SAGE builds without user intervention on 32-bit open Solaris x86 (under VMware) using gcc. * Hints for using Sun's CC compiler (which doesn't work, e.g., the crucial mwrank component doesn't compile): Using bash type: CC=cc && export CC CXX=CC && export CXX CFLAGS="-xO2" && export CFLAGS CXXFLAGS="-xO2" && export CXXFLAGS make * (From "Dr. David Kirkby" <david.kirkby@onetel.net>): I have noticed one problem if you try to build a 64-bit gmp. The order of the path seems critical. Get it wrong and it seems to pick up libraries in /usr/ucblib, which are 32-bit and so messes up. The following works. I have no idea why changing path (rather than library paths) would mess things up, but it seems to. PATH = /usr/sbin:/usr/bin:/opt/SUNWspro/bin:/usr/ccs/bin Also, the GMP library does not follow the Sun convention of putting 32-bit libraries in$LIB and 64-bit ones in
LIB/sparcv9. I think that could have quite annoying problems; however, for SAGE, where you have your own library I don't think it matters. * It seems likely that the compiler switch for a shared object on 64-bit SPARC is different from that for a 32-bit library. There is some confusion about this as the man page seems odd. I'm awaiting confirmation from someone at Sun about this. * From Kiran Kedlaya: In other news, I owe you some details of how I got SAGE running on Athena Solaris. In summary: -- GMP did not compile; there were some linking errors because of "unaligned offsets" (apparently a discrepancy between GNU ld and Sun ld). I got around this by using the libgmp that someone had already compiled for Singular on Athena Solaris. I also had to alias libgmp.so to libgmpxx.so because some of the SAGE modules compile using -lgmpxx. -- Python hit an error which I traced back to Include/pyport.h. I had to change HUGE_VAL, which is supposed to represent a positive double infinity, to (1./0.), which should have the same effect. I have no idea why this didn't work as written. -- Singular didn't compile either, but I didn't try very hard; I just used the Athena installed version (which is only 3-0-1, but I think it'll be fine). I don't remember offhand what kind of error I was getting. -- Support the troops: Bring them home ASAP.   0 michelle14 (19004) 12/8/2007 7:34:45 PM In article <noneof-AC775C.02292008122007@earthlink.vsrv-sjc.supernews.net>, Mark Conrad <noneof@urbusiness.invalid> wrote: > For Mac math' buffs, a new FREE open-source math' app' > called SAGE will be available for free shortly, which > claims to beat expensive commercial software > like Mathematica which costs2,500

I think Maple & Mathematica are not in danger yet.
SAGE may compete with XCAS, and it is not clear which would win...

As an aside, I note that Open Office hasn't put Microsoft Word out of

>
> Some team of math' experts at University of Washington are
> developing the app'
>
> Supposedly SAGE has already won awards in open competition at
> some world-wide math' conference.

That was not a "math" conference, but a competition for "free software".

 0
doozy (462)
12/8/2007 8:17:44 PM
In article <michelle-E06AFA.12344408122007@news.east.cox.net>,
Michelle Steiner <michelle@michelle.org> wrote:

> > Some team of math' experts at University of Washington are
> > developing the app'
> >
> > Supposedly SAGE has already won awards in open competition at
> > some world-wide math' conference.
> >
> > <http://uwnews.washington.edu/ni/article.asp?articleID=38459>
>
> I think that it has quite a ways to go before it becomes a threat to
> anything.  Here is the readme file:  ...<clip>...

Hmmmp -   as usual, I got a lot of things wrong, Philo pointed out
it was an open-source competition, not a math' competition.

....and you are correct, it looks to be a while before SAGE
will threaten Mathematica seriously.

According tho the readme file you posted, SAGE will not run
directly on any version of Windows yet, they have to do it
indirectly with VMware plus Linux.

That surprises me, because the Windows adverts usually yelp
about Windows supposedly running many more tech' app's than
OS X can run.

It appears that in January 2008 the feces will hit the fan as
regards whether-or-not SAGE will have a chance to displace the
regular costly commercial math' programs.

....based on the following propaganda from the website I listed:

Propaganda - Propaganda -
**********************************************
The idea began in 2005, when Stein was an assistant professor at Harvard
University.
"For about 10 years I had been really unhappy with the state of
mathematical software," Stein said. The big commercial programs --
Matlab, Maple, Mathematica and Magma -- charge license fees. The
Mathematica Web page, for example, charges $2,495 for a regular license. For another program, a collaborator in Colombia was quoted about$550, a
special "Third World" discount price, to buy a license to use a
particular tool, Stein said.
The frustrations weren't only financial. Commercial programs don't
always reveal how the calculations are performed. This means that other
mathematicians can't scrutinize the code to see how a computer-based
calculation arrived at a result.
"Not being able to check the code of a computer-based calculation is
like not publishing proofs for a mathematical theorem," Stein said.
"It's ludicrous."

Last month, Stein and David Joyner, a mathematics professor at the U.S.
Naval Academy in Annapolis, Md., published a letter in the Notices of
the American Mathematical Society in which they argue that the
mathematical community should support and develop open-source software.
Soon Sage will face off against the major software companies in physical
space. In early January, thousands of mathematicians will gather in San
Diego for the joint meeting of the American Mathematical Society and the
Mathematical Association of America. In the exhibition hall, Stein has
paid the first-timers' rate of $400 to rent a booth alongside those of the major mathematical software companies, where he and students will hand out DVDs with copies of Sage. "I think we can be better than the commercial versions," he said. "I really want it to be the best mathematical software in the world." Sage research and student support is made possible by grants from the National Science Foundation. The Sage meetings are supported by various mathematical associations. The project has also received several thousand dollars in private donations. ******************************************** End of Propaganda - Should be interesting to see how SAGE is accepted/rejected by all those math' wizards, two months from now. Mark-   0 noneof (1053) 12/8/2007 10:51:59 PM On Dec 8, 2:17 pm, Philo D <do...@earthling.net.invalid> wrote: > In article > <noneof-AC775C.02292008122...@earthlink.vsrv-sjc.supernews.net>, Mark > > Conrad <non...@urbusiness.invalid> wrote: > > For Mac math' buffs, a new FREE open-source math' app' > > called SAGE will be available for free shortly, which > > claims to beat expensive commercial software > > like Mathematica which costs$2,500
>
> I think Maple & Mathematica are not in danger yet.
> SAGE may compete with XCAS, and it is not clear which would win...
>
> As an aside, I note that Open Office hasn't put Microsoft Word out of
>
>
>
> > Some team of math' experts at University of Washington are
> > developing the app'
>
> > Supposedly SAGE has already won awards in open competition at
> > some world-wide math' conference.
>
> That was not a "math" conference, but a competition for "free software".

Here is what an article in F"AQ: Scientific Computing and Numerical
Analysis" said about Sage.  This article gives an altogether different
spin to Sage's capability than the link in Mark Conrad's post. A link
to the FAQ: Scientific Computing and Numerical Analysis can be found
in the sci . math . num-analysis news group.

Howard

SAGE

SAGE is a computer algebra plus mathematical software system.  It
includes interfaces to Magma, Maple, Mathematica, MATLAB, and MuPAD,
and the free programs Axiom, GAP, GP/PARI, Macaulay2, Maxima, Octave,
and Singular.

SAGE can be used from a web browser.  It connects either
to a program running on your computer, or to a server elsewhere.

The SAGE notebook can be used to create graphics, typeset
mathematical expressions, and to start up and
interrupt multiple calculations.  The notebook can be used
to create and publish collaborative worksheets.

SAGE is Python based.  It provides a standard, uniform Python
programming
interface to all the underlying systems.

 0
hrhan (218)
12/9/2007 1:06:18 AM

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Win & Mac programs, 'WinMac', 'PC/MaC', 'Win-Mac', 'Multi', 'Multi-Platform', 'MultiFormat', 'MULTIOS', 'HYBRID', updated 16/Feb/2005 Win & Mac programs, 'WinMac', 'PC/MaC', 'Win-Mac', 'Multi', 'Multi-Platform', 'MultiFormat', 'MULTIOS', 'HYBRID', updated 16/Feb/2005 ---------------------------------------------------------- Apple DVD Studio Pro 3 for MAC - image- DVD-158 ROUTE66 ROUTE EUROPE 2004 MAC EDITION Image DVD-060 2004/12/02 Techsmith.Camtasia.Studio.v2.1.Multi 1CD 2004/12/02 IDS.ARIS.Design.v6.2.3.Multi 1CD 2004/12/02 SampleLab.Drum.Fundamentals.Multiformat 3CD 2004/12/02 SampleLab.Lus... error: expected '=', ',', ';', 'asm' or '__attrib Hi I'm trying to compile an ADC Driver & come acrosss the following error. I've no experience writing drivers before, and hence have no clue how to fix it. Hope someone out there has encountered the problem & suggesst a fix for the same. The Error is I get is : qadc.c: At top level: qadc.c:97: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'qadc_read' make: *** [qadc.o] Error 1 [root@localhost qadc]# ########################################################################### ADC Driver Code ########################################################################### #define MODULE #define __KERNEL__ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> /* printk */ #include <linux/fs.h> / #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/proc_fs.h> /* proc file system */ #include <linux/fcntl.h> #include <asm/system.h> /* cli, flags */ #include <asm/uaccess.h> /* copy from/to user */ /*Registers to get qadc access*/ volatile unsigned short * qadcmcr = (unsigned short *)0x40190000; volatile unsigned short * qacr0 = (unsigned short *)0x4019000a; volatile unsigned short * qacr1 = (unsigned short *)0x4019000c; volatile unsigned short * qacr2 = (unsigned short *)0x4019000e; volatile unsigned short * qasr0 = (unsigned short *)0x40190010; volatile unsigned short * qasr1... error: expected '=', ',', ';', 'asm' or '__attrib Hi I'm trying to compile an ADC Driver & come acrosss the following error. I've no experience writing drivers before, and hence have no clue how to fix it. Hope someone out there has encountered the problem & suggesst a fix for the same. The Error is I get is : qadc.c: At top level: qadc.c:97: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'qadc_read' make: *** [qadc.o] Error 1 [root@localhost qadc]# ########################################################################### ADC Driver Code ##... logical to 'on' / 'off' Hi, is there a function implemented doing this conversion? my Problem is, that I want to use the following code: set(handles.edit_curr_trq_sl,'Enable',get(hObject,'Value')) where get(hObject,'Value') gives the state of a checkbox thank you! function [str]=tf2oo(logic) switch logic case 0 str='off'; case 1 str='on'; end%switch end%function tf2oo() while i do not know a built in function, I use my own:) meisterbartsch wrote: > > > function [str]=tf2oo(logic) > switch logic > case 0 > str='off'; &g... Re: '^=' and '~='? Duckhye, According to the doc ( http://xrl.us/befwjx ) they, and one other set of characters, and the mnemonic 'NE' all represent 'NOT EQUAL'. Art ------- On Wed, 11 Feb 2009 16:52:40 -0600, Duck-Hye Yang <dyang@CHAPINHALL.ORG> wrote: >Hello, >What is the difference between '^=' and '~='? > >Thanks, >Duckhye ... replacement for '{' and '}' ? I am still playing around with what kind of syntax I would like to mark up my documents. Are there equivalent long substitutes for { and } when they are not used to describe arguments to functions? Something like \begin{group} and \end{group}. In other words, if I could force myself to write, say, \begin{group} \it ... \end{group} instead of {\it ... }, then I believe I could identify from the markup context what is an argument that belongs to a just invoked macro and what is text. {Of course, in this context, \textit{...} would be better.} No more ambiguity whether a in \myfunction{a} is an argument or just text. Is there a way to make latex barf when it sees an ordinary '{' in text, rather than \begin{group}, but not barf when I want it (to denote macro arguments)? Regards, /iaw On Aug 16, 6:01=A0pm, "ivo...@gmail.com" <ivo...@gmail.com> wrote: > Is there a way to make latex barf when it sees an ordinary '{' in > text, rather than \begin{group}, but not barf when I want it (to > denote macro arguments)? What do you mean exactly? I don't understand. Do you have in mind your- to-be-new-syntax or just regular latex? Cheers, Tomek ivowel@gmail.com wrote: > I am still playing around with what kind of syntax I would like to > mark up my documents. > > Are there equivalent long substitutes for { and } when they are not > used to describe arguments to functions? Something like \begin{group} > and \end{gr... Override 'and' and 'or' Is it possible to override 'and' and/or 'or'? I cannot find a special method for it... __and__ and __rand__ and __or__ and __ror__ are for binary manipulation... any proposals? Have marvelous sunday, Marco Dekker <m.aschwanden@gmail.com> wrote: > Is it possible to override 'and' and/or 'or'? I cannot find a special > method for it... __and__ and __rand__ and __or__ and __ror__ are for > binary manipulation... any proposals? If you want to customize the truth value testing you have to implement __nonzero__ " __nonzero__( self) Call... difference between ',' and 'a,' Small question. In gforth is there a difference between the words ',' and 'a,'? I'm thinking not, so perhaps another question, why have both ',' and 'a,'? Thanks Should be the same, in gforth: see , : , here cell allot ! ; ok see a, : , here cell allot ! ; ok On Friday, January 9, 2015 at 5:46:04 AM UTC-8, beeflo wrote: > Small question. In gforth is there a difference between the words ',' and 'a,'? > > I'm thinking not, so perhaps another question, why have both ',' and 'a,'? > > Thanks beeflo <beeflobill@gmail.com> writes: >Small question. In gforth is there a difference between the words ',' and 'a,'? > >I'm thinking not, so perhaps another question, why have both ',' and 'a,'? In Gforth itself, there is no difference. In Gforth's cross compiler, "a," is there for addresses, and "," is there for other cells; addresses can then be relocated when loading the image. - anton -- M. Anton Ertl http://www.complang.tuwien.ac.at/anton/home.html comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html New standard: http://www.forth200x.org/forth200x.html EuroForth 2014: http://www.euroforth.org/ef14/ ... '!' vs. '.' Is there an advantage to using the '!' notation to represent form/ control relationships? (eg. Me!text1 vs Me.text1) I am currently using the '.' notation exclusively (for code completion in the VB Editor), but much of the high-quality code that I've seen (in Duane Hookom's Query-by-Form db, for example) uses the other. Here's one opinion for you: http://doc.advisor.com/doc/05352 robert.waters wrote: >Is there an advantage to using the '!' notation to represent form/ >control relationships? (eg. Me!text1 vs Me.text1) > >I am currently using the '.' notation exclusively (for code completion >in the VB Editor), but much of the high-quality code that I've seen >(in Duane Hookom's Query-by-Form db, for example) uses the other. -- HTH - RuralGuy (RG for short) acXP WinXP Pro Please post back to this forum so all may benefit. Message posted via AccessMonster.com http://www.accessmonster.com/Uwe/Forums.aspx/databases-ms-access/200704/1 Here's my$0.02 worth on this. I tend to copy the notation style and naming conventions that I see being used in the Help files. That would be Me![text1] for a control on a form. I am of the belief that this notation explicitly refers to a control itself rather than a field in the form's recordset. Here's an example: I have a parts inventory app that uses a "Line" code, which is usually a 3-character abbreviation for a brand name, and is the na...

'a'..'z'
Is it possible to achieve something like this? switch (mystring.charAt(0)) { case 'a'..'z': // do something break; } "cruster" <cruster@gmail.com> wrote in message news:1151319731.988814.326200@m73g2000cwd.googlegroups.com... > Is it possible to achieve something like this? > > switch (mystring.charAt(0)) { > case 'a'..'z': > // do something > break; > } > There are times when an if statement may be more appropriate ;) Sorry - java is not VB :) -- LTP :) cruster schreef: > Is it possible to achieve somethi...

'[OFF]' as in 'offensive'???
Hi, given that 'off-topicness' is indicated as '[OT]' and taking a look at those postings that started the threads indicated as '[OFF]' (which may both be seen as being somewhat offensive) may lead to the conclusion that '[OFF]' stands for offensiveness. I don't think that this is the intended meaning so what actually *does* '[OFF]' mean? I never came across that abbreviation before (although I have been around on the USENET for quite some time) but maybe it is worth knowing? Josef 'Jupp' Schugt NOTE: mails >100 KiB are ignored -- German edition of comp.lang.ruby FAQ - http://oss.erdfunkstelle.de/ruby/ Aurox Linux - http://qurl.net/7q | http://qurl.net/7r - Firefox Thunderbird - http://qurl.net/7s | http://qurl.net/7t - Liferea Enigmail - http://qurl.net/7u | http://qurl.net/7v - GnuPG [Josef 'Jupp' Schugt <jupp@gmx.de>, 2004-12-10 23.20 CET] > I don't think that this is the intended meaning so what actually *does* > '[OFF]' mean? Off-topic. ...

Difference between 'is' and '=='
Hey guys, this maybe a stupid question, but I can't seem to find the result anywhere online. When is the right time to use 'is' and when should we use '=='? Thanks alot~ mwql: >Hey guys, this maybe a stupid question, but I can't seem to find the >result anywhere online. When is the right time to use 'is' and when >should we use '=='? http://docs.python.org/ref/comparisons.html -- Ren� Pijlman mwql wrote: > Hey guys, this maybe a stupid question, but I can't seem to find the > result anywhere online. When is the right time to ...

Does '!=' equivelent to 'is not'
I'm a bit confusing about whether "is not" equivelent to "!=" if a != b: ... if a is not b: ... What's the difference between "is not" and "!=" or they are the same thing? pirata wrote: > I'm a bit confusing about whether "is not" equivelent to "!=" > > if a != b: > ... > > if a is not b: > ... > > > What's the difference between "is not" and "!=" or they are the same thing? No, they are not the same thing. == and != test to see if the *value* of two variables are the same. Like so: >>> a = 'hello world' >>> b = 'hello world' >>> a == b True a and b both have the value of 'hello world', so they are equal is and is not, however, do not test for value equivalence, they test for object identity. In other words, they test to see if the object the two variables reference are the same object in memory, like so: >>> a is b False a and b are assigned to two different objects that happen to have the same value, but nevertheless there are two separate 'hello world' objects in memory, and therefore you cannot say that a *is* b Now look at this: >>> c = d = 'hello world' >>> c == d True >>> c is d True In this case, they are again the same value, but now the is test also shows that they are the same *object* as well, because...

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