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  • Fixed point math in c#?

    - by x4000
    Hi there, I was wondering if anyone here knows of any good resources for fixed point math in c#? I've seen things like this (http://2ddev.72dpiarmy.com/viewtopic.php?id=156) and this (http://stackoverflow.com/questions/79677/whats-the-best-way-to-do-fixed-point-math), and a number of discussions about whether decimal is really fixed point or actually floating point (update: responders have confirmed that it's definitely floating point), but I haven't seen a solid C# library for things like calculating cosine and sine. My needs are simple -- I need the basic operators, plus cosine, sine, arctan2, PI... I think that's about it. Maybe sqrt. I'm programming a 2D RTS game, which I have largely working, but the unit movement when using floating-point math (doubles) has very small inaccuracies over time (10-30 minutes) across multiple machines, leading to desyncs. This is presently only between a 32 bit OS and a 64 bit OS, all the 32 bit machines seem to stay in sync without issue, which is what makes me think this is a floating point issue. I was aware from this as a possible issue from the outset, and so have limited my use of non-integer position math as much as possible, but for smooth diagonal movement at varying speeds I'm calculating the angle between points in radians, then getting the x and y components of movement with sin and cos. That's the main issue. I'm also doing some calculations for line segment intersections, line-circle intersections, circle-rect intersections, etc, that also probably need to move from floating-point to fixed-point to avoid cross-machine issues. If there's something open source in Java or VB or another comparable language, I could probably convert the code for my uses. The main priority for me is accuracy, although I'd like as little speed loss over present performance as possible. This whole fixed point math thing is very new to me, and I'm surprised by how little practical information on it there is on google -- most stuff seems to be either theory or dense C++ header files. Anything you could do to point me in the right direction is much appreciated; if I can get this working, I plan to open-source the math functions I put together so that there will be a resource for other C# programmers out there. UPDATE: I could definitely make a cosine/sine lookup table work for my purposes, but I don't think that would work for arctan2, since I'd need to generate a table with about 64,000x64,000 entries (yikes). If you know any programmatic explanations of efficient ways to calculate things like arctan2, that would be awesome. My math background is all right, but the advanced formulas and traditional math notation are very difficult for me to translate into code.

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  • Personal Project - Next practical language/tech to learn

    - by Paul Nathan
    I'm working on a personal project doing some finance analysis. It's a totally new field for me, and I'm really having fun with it so far, plus working in the high-level language arena is a great break from my embedded systems daytime work. I have a MySQL backend on a non-local server with a pile of stock data. My task now is to do some analysis of the stocks and produce something approximating a useful result. There are a couple technical difficulties. (1) I have a lot of records. To be precise, I believe I'm near 100K records right now, and this number grows by 6.1K each weekday. I need to create a way to rummage through these fields and do data analysis - based on a given computation, go look at this other set. Fine and dandy, nothing too outre. But this means I could really use a straightforward API for talking to MySQL. (2) Ideally, it runs on OS X 10.4.11. No Windows/Linux machine at home. (3) I can use PHP, C++, Perl, etc. I even have an R installation. I'm pretty flexible with stuff, so long as it runs on OS X. (Lots of options here, pick water, H20, or dihydrogen monoxide ;-) ) (4)Lack of hassle. While I like clever and fun ways of doing things, I'm trying to get some analysis done, not spend ten hours doing installation work and scratching my head figuring out a theoretical syntax question needed to spout out "hello world". What's the question? I'd like to dig into something different than my usual PHP/C++/C toolset. I'm looking for recommendations for languages/technologies that will assist me and meet the above requirements. In particular, I've heard a lot of buzz about F# and Python on SO. I've used CLISP for small problems before, and kinda liked it. I'm seeking opinions about those in particular. edit:since I rent the DB server and have a limited amount of CPU time online, I'm trying to do the analysis on a local machine.

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  • Why Windows 7 isn't written in C#?

    - by Joan Venge
    I saw a similar question about the reason Google Chrome wasn't written in C#. But with the upcoming version of Windows and Microsoft's flagship language, I am having a hard time understanding why Microsoft isn't pushing C# to its fullest potential to give it more exposure via their market share? In addition can be interpreted as "Is C# and the .Net framework suitable to run a modern OS like Windows 7" Btw this is not a flaming question, but curiosity. I use C# daily and really love it.

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  • Need to change the default browser for an MVC2 project

    - by schefdev
    I just created my first MVC2 project using the standard template. I need to be able to change the default browser for my project to test in IE (I use chrome as the default on my OS). Unfortunately, the "right click on default.aspx" suggestion which worked in MVC1 can't work with these new projects as they don't have that file. I'm sure I'm overlooking something simple... Thanks.

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  • Display pdf within app on android?

    - by alex
    I got very frustrated when I realized that android is not able to display pdfs (in a webview or whatever) out-of-the-box. So my question, are there any (os) jars or classes to display a pdf document within an app? Thx in advance, alex

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  • Silverlight IDE for latest version (May 2010)

    - by lexu
    In 2008 Artur Carvalho asked for an Alternative IDE for Silverlight and was told to look at Visual Studio Express. Is that still the valid answer in 2010 or are there other IDEs one should consider (cost/ OS it runs on / stability)? I'm trying to get a feel for silverlight development before commiting cash. So I don't need enterprize level tools or a license to distribute .. Would MonoDevelop and Moonlight be an option?

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  • Unable to connect to MS Access database through JDBC on Win 7 64-bit

    - by Ninad
    Hello. I've been trying to connect to a MS Access 2007 database through JDBC. My JDK is JDK 1.6u18 64-bit and OS is Windows 7 64-bit. But problem is I am unable to create a DSN using Windows\system32\odbcad32.exe because it doesn't show ODBC drivers for MS Access at all, it's only showing drivers for MS SQL Server. When tried to click on Configure for "MS Access Database" (which is an already created DSN, I guess), it first shows error message : "The setup routines for the Microsoft Access Drivers (*.mdb, *.accdb) ODBC Driver could not be found. Please reinstall the driver." And then another message : "Errors found! The specified DSN contains an architecture mismatch between the Driver and Application." I cannot reinstall the MDAC as it doesn't work with Windows 7 (which comes with its own WDAC). The odbcad32.exe in Windows\SysWOW64 does let me create a DSN for MS Access, it shows the drivers installed properly. However, when tried to connect to that DSN through a Java program, I get the following exception : java.sql.SQLException: [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source) at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at AccessTest.main(AccessTest.java:19) What might be the problem and what do I have to do to get it working? My OS as well as JDK are 64-bit. Can't I connect to a Access 2007 database, which I presume is 32-bit? Any help would be highly appreciated. Also, in case one thinks this's not a right place for this question, I apologize in advance. Then please guide me to appropriate forum. Another option would be to find a third-party JDBC driver for MS Access. But I do need to know what's wrong with my configuration. :-/ PS : I know there're many better databases available out there, but for few unfortunate reasons, I have to use MS Access only and have to get it working.

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  • cross compilers

    - by Elad
    I've seen the about cross compilers reply at http://stackoverflow.com/questions/579695/how-do-i-cross-compile-c-code-on-windows-for-a-binary-to-also-be-run-on-unix-sol and i would like to know how can i compile for sparc on x86 machine? where can i find a good cross compiler? I also need for HP OS . if you link me to a good step by step tutorial It will be the best Thanks. Elad.

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  • FindBugs: "may fail to close stream" - is this valid in case of InputStream?

    - by thSoft
    In my Java code, I start a new process, then obtain its input stream to read it: BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); FindBugs reports an error here: may fail to close stream Pattern id: OS_OPEN_STREAM, type: OS, category: BAD_PRACTICE Must I close the InputStream of another process? And what's more, according to its Javadoc, InputStream#close() does nothing. So is this a false positive, or should I really close the input stream of the process when I'm done?

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  • OpenGl ES Eraser Tool

    - by Erika
    Hi Everyone, I am trying to implement an OpenGL eraser tool. I am struggling with this. I was thinking of painting somehow over the previous changes to "clear" out the changes. I can't use the background color because it is not a pattern, not one solid color. Can you point me to the right direction on how to implement an eraser tool ? This is for the iPhone OS but that shouldn't matter. Thanks

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  • Default Eclipse preferences

    - by DanyW
    Hi everyone, I have previously exported the default preferences but accidentally deleted it. Is there anywhere I can download the default set of preferences from? I am running the latest version on Mac OS X. Thanks, Dany.

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  • Getting syntax errors when building with python 3.1 and not with python 2.6

    - by mathan
    Hi All, Using Mac os X 10.6, python 3.1 and gcc 4.0 trying to build pyfsevent implemented in python2.6 by converting it to python 3.1. Wondering when getting the following errors while building in python 3.1 alone. Why not when building with python 2.6? error: syntax error before ‘CFFileDescriptorRef’ warning: no semicolon at end of struct or union error: syntax error before ‘}’ token warning: data definition has no type or storage clas

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  • Retro video games programming

    - by SebKom
    I just watched the Super Mario Bros. -1 World glitch in youtube and I really began wondering about the code behind those games. Which language was used? What about the OS for the video games consoles? Are there any website with resources about this subject? (I am a 90s video gamer so I am particularly interested about the programming behind those games but feel free to make this a wiki and include links to resources about video games programming in general, if you want)

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  • Get client ip with python

    - by Elad
    Hi, I'm a newbie in python. I want to write a simple web that prints the client ip on screen my http.conf Handler: AddHandler mod_python .py PythonHandler mod_python.publisher PythonDebug On The cgi.escape(os.environ["REMOTE_ADDR"]) return this error: KeyError: 'REMOTE_ADDR' and I just get lost with the BaseHTTPRequestHandler so what is the simple way to get the client ip? thank you.

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  • JSON Feed Appears to be XHR when it should be JS

    - by Oscar Godson
    I don't get why it'd doing this with the 2nd feed (appearing as a XHR call rather than just JS [looking at it in Firefox/Firebug]). The 2nd feed has the exact same MIME type as Flickr's JSON feed, yet the PortlandOregon.gov one shows as XHR and i get a NULL callback when using $.getJSON and if i use $.ajax with a 'json' or 'jsonp' type i get nothing at all. If i do the Flickr one i get the normal "[object Object]" callback. Whats going on? Please help! This has been such a headache for about a week. And i have authorization to change the feed, but i have to request the change, so if anyone knows for absolute sure let me know that! Response Headers from Flickr's API ( http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=? ) [JS]: Date Mon, 15 Mar 2010 21:56:06 GMT P3P policyref="http://p3p.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE GOV" Expires Mon, 26 Jul 1997 05:00:00 GMT Last-Modified Mon, 15 Mar 2010 21:52:17 GMT Cache-Control no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma no-cache Vary Accept-Encoding Content-Encoding gzip Content-Length 3647 Connection close Content-Type application/x-javascript; charset=utf-8 Request Headers Host api.flickr.com User-Agent Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 Accept */* Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 115 Connection keep-alive Referer http://oscargodson.com/dev/addWidget/test.html Cookie BX=4lflj455amesp&b=3&s=iv; fltoto=0%2C0%2C0%2C0%2C1%2C0%3B0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%3B1%3B0%3B; search_z=t; localization=en-us%3Bus%3Bus PortlandOregon.gov ( http://www.portlandonline.com/shared/cfm/json.cfm?c=27321 ) [XHR]: Response Headers Connection close Date Mon, 15 Mar 2010 21:57:49 GMT Server Microsoft-IIS/6.0 Set-Cookie CONTACT_ID=0;path=/ LAST_USER=;path=/ BIGipServercgis_pol_web_pool-http=1191537418.20480.0000; path=/ Content-Type application/x-javascript; charset=utf-8 Request Headers Host www.portlandonline.com User-Agent Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 Accept application/json, text/javascript, */* Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 115 Connection keep-alive Referer http://oscargodson.com/dev/addWidget/test.html Origin http://oscargodson.com

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  • MySQL Backup: Can I copying individual MyISAM table files to another server with different MySQL ver

    - by Komputer
    I means copying individual MyISAM table files is: (shut down mysqld and copy the .frm, .myd, and .myi files from one database folder to another) Question: (a) can I use this way to backup MySQL database folder from one server to another server with different MySQL version? (b) can this backup files moved to different OS? (example: debian to centos) thanks in advance.

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  • Running shell scripts with sudo through my Rails app

    - by nfm
    In my Rails app, I have some functionality that interfaces with the server's OS. I've written a bash script, put it in my lib/ subdirectory, and can run it from my controller. However, some functionality of the script requires superuser privileges. What is the most sane way to run this script securely? It is being passed arguments from a web form, but should only be able to be called by authenticated (and trusted) users.

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  • How does changing armv6/armv7 architecture to armv6 affect my iPad app? Will there be performance/st

    - by Flocked
    Hello, I need to change the the architectures of "Any iPhone OS Device" from "Optimized (armv6 armv7)" to "Standard (armv6)" for a library. I'm not exactly sure what effect will this have on the performance and stability of my iPad app. If I understand it right, the iPad has the armv7 architecture. I'm not so familiar with architectures, so I don't know what it means.

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  • Visual Studio 2008 breakpoint is not working

    - by user279521
    I am working on an ASP.NET project and I cannot make the breakpoints work! The project does not stop where I place a breakpoint. It does not seem to matter where I place the breakpoint. I am in debug mode; I am using IE 8, Windows 7 OS; Has anyone ever had this problem?

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  • Trace/BPT trap when running feedparser inside a Thread object

    - by simao
    Hello, I am trying to run a Thread to parse a list of links using the universal feed parser, but when I start the thread I get a Trace/BPT trap. Here's the code I am using: class parseRssFiles(Thread): def __init__ (self,rssLinks): Thread.__init__(self) self.rssLinks = rssLinks def run(self): self.rssContents = [ feedparser.parse(link) for link in rssLinks] Is there any other way to do this? Link to the report generated by Mac OS X 10.6.2: http://simaom.com/trace.txt Thanks

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  • Scipy Negative Distance? What?

    - by disappearedng
    I have a input file which are all floating point numbers to 4 decimal place. i.e. 13359 0.0000 0.0000 0.0001 0.0001 0.0002` 0.0003 0.0007 ... (the first is the id). My class uses the loadVectorsFromFile method which multiplies it by 10000 and then int() these numbers. On top of that, I also loop through each vector to ensure that there are no negative values inside. However, when I perform _hclustering, I am continually seeing the error, "Linkage Z contains negative values". I seriously think this is a bug because: I checked my values, the values are no where small enough or big enough to approach the limits of the floating point numbers and the formula that I used to derive the values in the file uses absolute value (my input is DEFINITELY right). Can someone enligten me as to why I am seeing this weird error? What is going on that is causing this negative distance error? ===== def loadVectorsFromFile(self, limit, loc, assertAllPositive=True, inflate=True): """Inflate to prevent "negative" distance, we use 4 decimal points, so *10000 """ vectors = {} self.winfo("Each vector is set to have %d limit in length" % limit) with open( loc ) as inf: for line in filter(None, inf.read().split('\n')): l = line.split('\t') if limit: scores = map(float, l[1:limit+1]) else: scores = map(float, l[1:]) if inflate: vectors[ l[0]] = map( lambda x: int(x*10000), scores) #int might save space else: vectors[ l[0]] = scores if assertAllPositive: #Assert that it has no negative value for dirID, l in vectors.iteritems(): if reduce(operator.or_, map( lambda x: x < 0, l)): self.werror( "Vector %s has negative values!" % dirID) return vectors def main( self, inputDir, outputDir, limit=0, inFname="data.vectors.all", mappingFname='all.id.features.group.intermediate'): """ Loads vector from a file and start clustering INPUT vectors is { featureID: tfidfVector (list), } """ IDFeatureDic = loadIdFeatureGroupDicFromIntermediate( pjoin(self.configDir, mappingFname)) if not os.path.exists(outputDir): os.makedirs(outputDir) vectors = self.loadVectorsFromFile( limit, pjoin( inputDir, inFname)) for threshold in map( lambda x:float(x)/30, range(20,30)): clusters = self._hclustering(threshold, vectors) if clusters: outputLoc = pjoin(outputDir, "threshold.%s.result" % str(threshold)) with open(outputLoc, 'w') as outf: for clusterNo, cluster in clusters.iteritems(): outf.write('%s\n' % str(clusterNo)) for featureID in cluster: feature, group = IDFeatureDic[featureID] outline = "%s\t%s\n" % (feature, group) outf.write(outline.encode('utf-8')) outf.write("\n") else: continue def _hclustering(self, threshold, vectors): """function which you should call to vary the threshold vectors: { featureID: [ tfidf scores, tfidf score, .. ] """ clusters = defaultdict(list) if len(vectors) > 1: try: results = hierarchy.fclusterdata( vectors.values(), threshold, metric='cosine') except ValueError, e: self.werror("_hclustering: %s" % str(e)) return False for i, featureID in enumerate( vectors.keys()):

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