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• Can anyone give me a sample DSP script in C/C++

  - by Andrew

  Im working on a (Audio) DSP project and just wondering if there are any sample (Open source) DSP example that are written in c or c++, for my MSP430 Chip. I just want something as a guideline so i can program my own script using the ACD and DCA on my board for sampling. http://focus.ti.com/docs/toolsw/folders/print/msp-exp430f5438.html Thats my board, MSP430F5438 Experimenter Board, from what i herd it can run dsp script via the USB connection with the computer. Im using CCS ( From TI, code composer studio) and Octave/Matlab. Just any DSP example scripts or sites that will help me create my own would be appreciated. What im tying to do, Partial audio (sampled) track -- Nyquist rate sampling -- over- and undersampling -- reconstruction of the audio track.

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• Use SendMessage in C# to perform a CTRL-C operation on a given handle

  - by gtaborga

  Hello everyone, I'm trying to perform a (CTRL-C) copy on a window. I've already managed to do this using SendInput but unfortunately that could fail if the window doesn't have focus. I'm trying to perform the same (CTRL-C) operation using SendMessage in C#. So far I haven't been successful in getting the WPARAM and LPARAM combination for this to work. I have also tried using SendMessage with the WM_COPY message but that didn't work for my needs. Please if anyone has done this before successfully using SendMessage I would greatly appreciate your help.

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• Android: How to restore List data when pressing the "back" button?

  - by Rob

  Hi there, My question is about restoring complex activity related data when coming back to the activity using the "back" button". Activity A has a ListView which is connected to ArrayAdapter serving as its data source - this happens in onCreate(). By default, if I move to activity B and press "back" to get back to activity A, does my list stay intact with all the data or do I just get visual "copy" of the screen but the data is lost? What can I do when more than activities are involved? Let's say activity A starts activity B which starts activity C and then I press "back" twice to get to A. How do I ensure the integrity of the A's data when it gets back to the foreground? PrefsManager does not seem to handle complex object very intuitively. Thanks, Rob

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• Microsoft Business Intelligence. Is what I am trying to do possible?

  - by Nai

  Hi guys, I have been charged with the task of analysing the log table of my company's website. This table contains a user's click path throughout the website for a given session. My company is looking to understand/spot trends based on the 'click paths' of our users. In doing so, identify groups of users that take on a certain 'click path' based on age/geography and so on. As you can tell from the title, I am completely new to BI and its capabilities so I was wondering: Are our objectives attainable? How should I go about doing this? I am currently reading books online as well as other e-books I have found. All signs seem to suggest this is possible via sequence clustering. Although the exact implementation and tweaks involved are currently lost on me. Therefore, if anyone has first hand experience in such an undertaking, I would be awesome if you could share it here. Cheers!

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• What is the correct usage of blueprint-typography-body([$font-size])?

  - by Alexis Abril

  Recent convert to RoR and I've been using Compass w/ Blueprint to dip into the proverbial pool. Compass has been fantastic, but I've come across something strange within the Typography library. The blueprint-typography-body mixin contains the following: =blueprint-typography-body($font-size: $blueprint-font-size) line-height: 1.5 +normal-text font-size: 100% * $font-size / 16px My question revolves around "font-size." I'm a bit lost, as I would expect to pass in a font size and have that size reflected upon page load. However, in this scenario the formula seems to dictate a percentage against the default font. ie: +blueprint-typography-body(10px) //produces 7.5px off of the default font size of 12px from what I can tell. In essence, I'm curious if there is a standard to setting font size within Compass other than explicitly declaring "font-size: 10px". Note: The reason I'm leaning towards Blueprint/Compass font stylings is due to the standardization of line-heights, fonts and colors.

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• howto hide outline on a form

  - by justjoe

  i have to design a form with an input inside it. i use background image on the input so it would look like a button. so every time somebody click it, then it would send $POST, a behavior i want to achieve. But the problem is about the outline around the form. The outline show when we click the form. It's minor, but it would be great to make the form (or input) lost it outline. i test it using Firefox 3.6 and flock. Both of them show the outline behavior that i want to avoid

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• .attr("disabled", "disabled") problem

  - by meo

  i have this function where basically add and remove the disabled attribute form a input field: $(bla).click(function(){ if (something) { console.log($target.prev("input")) // gives out the right object $target.toggleClass("open").prev("input").attr("disabled", "disabled"); }else{ $target.toggleClass("open").prev("input").removeAttr("disabled"); //this works } }) the removeAttr works fine but when i need to add the disabled again it does just nothing. My console.log is triggering (and giving me back the right input field) so I'm sure my that my if statement works. But if i inspect the DOM with firebug the disabled attribute does not appear. can someone help me? PS: please don't focus on the function or the if statement itself, works fine its just that attr that dies not work for disabled...

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• Matrix multiplication in java (RE-POST)

  - by Chapax

  Apologies for the re-post; the earlier time I'd posted I did not have all the details. My colleague, who quit the firm was a C# programmer, was forced to write Java code that involved (large, dense) matrix multiplication. He's coded his own DataTable class in Java, in order to be able to a) create indexes to sort and join with other DataTables b) do matrix multiplication. The code in its current form is NOT maintainable/extensible. I want to clean up the code, and thought using something like R within Java will help me focus on business logic rather than sorting, joining, matrix multiplication, etc. Plus, I'm very new to the concept of DataTable; I just want to replace the DataTable with 2D arrays, and let R handle the rest. (I currently do not know how to join 2 large datasets in java very efficiently Please let me know what you think. Also, are there any simple examples that I can take a look at?

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• JSF & jqPlot Uncaught TypeError

  - by sdg

  I have a problem using jqPlot with JSF I added this code to my JSF page: $(document).ready(function () { var s1 = [200, 600, 700, 1000]; var s2 = [460, - 210, 690, 820]; var s3 = [-260, - 440, 320, 200]; var ticks = ['May', 'June', 'July', 'August']; var plot1 = $.jqplot('chart1', [s1, s2, s3], { // The "seriesDefaults" option is an options object that will // be applied to all series in the chart. seriesDefaults: { renderer: $.jqplot.BarRenderer, rendererOptions: { fillToZero: true } }, series: [{ label: 'Hotel' }, { label: 'Event Regristration' }, { label: 'Airfare' }], legend: { show: true, placement: 'outsideGrid' }, axes: { xaxis: { renderer: $.jqplot.CategoryAxisRenderer, ticks: ticks }, yaxis: { pad: 1.05, tickOptions: { formatString: '$%d' } } } }); }); but when I try to load the page I got this error : Uncaught TypeError: Cannot read property 'BarRenderer' of undefined (anonymous function)portfolioModeling.xhtml:184 f.extend._Deferred.e.resolveWithjquery.min.js:2 e.extend.readyjquery.min.js:2 c.addEventListener.C I added the whole required js files and also the css file but I am lost and don't know where is the problem Thanks in advance

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• Share pre-initialized GIT repository

  - by Theo.T

  We were sharing a GIT repository via file-sharing system (smb://) and got it badly corrupted (a power cut meanwhile the post-send :P). Being new to GIT, trying to fix it I made it even worse and I lost all the refs (left with the object folder). Since the incident I haven't had the time to look at the problem and have just been keeping committing to my local clone. So my question is : Is there a way to copy the local repository back to the location of the old repository and make it a shared repository in order to keep some track of previous the history ? That's all I could figure out (I'm still a git-noob), any other solutions are more than welcome ! Thanks in advance !

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• [Gdata] GetAuthSubToken returns None

  - by Matt

  Hey guys, I am a little lost on how to get the auth token. Here is the code I am using on the return from authorizing my app: client = gdata.service.GDataService() gdata.alt.appengine.run_on_appengine(client) sessionToken = gdata.auth.extract_auth_sub_token_from_url(self.request.uri) client.UpgradeToSessionToken(sessionToken) logging.info(client.GetAuthSubToken()) what gets logged is "None" so that does seem right :-( if I use this: temp = client.upgrade_to_session_token(sessionToken) logging.info(dump(temp)) I get this: {'scopes': ['http://www.google.com/calendar/feeds/'], 'auth_header': 'AuthSub token=CNKe7drpFRDzp8uVARjD-s-wAg'} so I can see that I am getting a AuthSub Token and I guess I could just parse that and grab the token but that doesn't seem like the way things should work. If I try to use AuthSubTokenInfo I get this: Traceback (most recent call last): File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/__init__.py", line 507, in __call__ handler.get(*groups) File "controllers/indexController.py", line 47, in get logging.info(client.AuthSubTokenInfo()) File "/Users/matthusby/Dropbox/appengine/projects/FBCal/gdata/service.py", line 938, in AuthSubTokenInfo token = self.token_store.find_token(scopes[0]) TypeError: 'NoneType' object is unsubscriptable so it looks like my token_store is not getting filled in correctly, is that something I should be doing? Also I am using gdata 2.0.9 Thanks Matt

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• User account design and security...

  - by espinet

  Before I begin, I am using Ruby on Rails and the Devise gem for user authentication. Hi, I was doing some research about account security and I found a blog post about the topic awhile ago but I can no longer find it again. I read something about when making a login system you should have 1 model for User, this contains a user's username, encrypted password, and email. You should also have a model for a user's Account. This contains everything else. A User has an Account. I don't know if I'm explaining this correctly since I haven't seen the blog post for several months and I lost my bookmark. Could someone explain how and why I should or shouldn't do this. My application deals with money so I need to cover my bases with security. Thanks.

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• How to work with BufferedImage and YCbCr colorspace?

  - by Onlyx

  Hi everyone! I need to translate colors in bitmap loaded to BufferedImage from RGB to YCbCr (luminance and 2 channels chrominance) and back after process. I made it with functions used like rgb2ycbcr() in main method for each pixel, but it isn't so smart solution. I should use ColorSpace and ColorModel classes to get BufferedImage with correct color space. It would be more flexible method, but I don't know how to do that. I'm lost and I need some tips. Can somebody help me?

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• aio_write on linux with rtkaio is sometimes long

  - by Drakosha

  I'm using async io on linux with rtkaio library. In my tests everything works perfectly, but, in my real application i see that aio_write which is supposed to return very fast, is very slow. It can take more than 100 milis to write a 128KB to a O_DIRECT padded file. Both my test and the application use same I/O size, i check on the same file system (GFS). I added counting and i see that there are about 50% of async io operations that are short (shorter then 2 milis) and 50% that are long (longer than 2 milis). I also checked that the test and the application both use the same rtkaio library. I'm pretty lost, anyone any ideas where should i look? Another my related question: http://stackoverflow.com/questions/1799537/proc-sys-fs-aio-nr-is-never-higher-than-1024-aio-on-linux

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• Bitbanging a PIO on Coldfire/ucLinux

  - by G Forty

  Here's the problem: I need to program some hardware via 2 pins of the PIO (1 clock, 1 data). Timing constraints are tight - 10ms clock cycle time. All this, of course, whilst I maintain very high level services (CAN bus, TCP/IP). The downstream unit also ACKS by asserting a PIO pin, configured as an input, high. So this loop has to both read and write. I need to send 16 bits in the serial stream. Is there an established way to do this sort of thing or should I simply get the hardware guys to add a PIC or somesuch. I'd much prefer to avoid exotics like RTAI extensions at this stage. I did once see a reference to user-mode IO which implied a possible interrupt driven driver but lost track of it. Any pointers welcomed.

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• How disable RequiredFieldValidator in script

  - by jlp

  I have TextBox with RequiredFieldValidator on my page. I also have link that calls some simple javascript. <asp:TextBox ID="TextBox1" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox1" Display="Dynamic" /> <asp:LinkButton ID="Link1" runat="server" OnClientClick="DoSomething(); return false;" CausesValidation="false"Text="Do" /> function DoSomething() { textbox1.val("blah"); } How to prevent RequiredFieldValidator to fire when TextBox1 is empty and it looses focus? I want RequiredFieldValidator only to fire on postback.

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• javascript question - onclick

  - by harry_T

  I am trying to get this code to work, but it keeps failing. try this link.. http://tinyurl.com/ye5khug enter Edmonton, click on icon, then on "web site". <script> function newPop(url, myWin, width, height, left, top, scrollbars) { parms = 'toolbar=yes, scrollbars=no, location=no, menubar=no, resizable=no, width= ' + width + ' , height=' + height + ' , left= ' + left + ' , top= ' + top + ' , titlebar=no , scrollbars = ' + scrollbars ; var newwin = window.open(url,myWin, parms); newwin.resizeTo(width,height); newwin.moveTo(0,0); newwin.moveTo(left,top); newwin.focus(); return false; } </script> <a onclick=" return newPop('http://google.com','window', '800','800','100','0','yes')" href="#">Web Site</a>

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• How should I deploy a patch to a Passenger-based production Rails application without downtime?

  - by Olly

  I have a Passenger-based production Rails application which has thousands of users. Occasionally we need to apply a code patch (we use git) and the current process for doing this (you can assume there are no data migrations) is: Perform git pull origin [production-branch-name] on the server touch tmp/restart.txt to restart Passenger This allows us to patch the server without having to resort to putting up a maintenance page, which is great, but it doesn't feel quite right since it's not actually a proper 'deployment', and we still need to manually update the revision file and our deployment doesn't appear in the Hoptoad or NewRelic services we use. Ideally I would run cap production deploy and just let the standard Capistrano deployment script take care of everything, but is this a dangerous thing to do without putting up a maintenance page? This deployment process seems to be fairly safe in that the new revision is deployed to a completely separate folder and only right at the end of the process is a symlink re-created to switch the currently deployed version, but I'm still fairly paranoid about this somehow resulting in a lost or failed request.

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• How to create Editable Dropdown List with Dictionary Option using JavaScript?...

  - by kumar

  Hi Guys, Eg:-- When I type "A" all the elements starting with A should be displayed... If "B" then elements with B....etc) Ex: <asp:DropDownList ID="ddlLocation" style="width:140px" runat="server"> <asp:ListItem Value="1" >India</asp:ListItem> <asp:ListItem Value="2" >India - Hyderabad</asp:ListItem> <asp:ListItem Value="3">South Africa</asp:ListItem> <asp:ListItem Value="4">Australia</asp:ListItem> </asp:DropDownList> javascript : function DisplayText() { var textboxId = '<% = txtText.ClientID %>'; var dropdownListId = '<% = ddlLocation.ClientID %>'; document.getElementById(textboxId).value = document.getElementById(dropdownListId).value; document.getElementById(textboxId).focus(); } code behind : ddlLocation.Attributes.Add("onChange", "DisplayText();"); Regards ravi,

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• NSManagedObject - NSSet gets removed ??

  - by aryaxt

  I have an nsmanagedObject this NSManagedObject contains an NSSet. the data for NSSet get's lost when i call release on an NSManagedObject with retain count of 2. Wouldn't retaining an NSManagedObject also retain all it's properties?? - (id)initViewWithManagedObject :(NSManagedObject)obj { if (self = [super init]) { self.managedObject = obj; } } - (void)dealloc { [self.managedObject release]; //Here is when the nsset data gets removed [super dealloc]; } Below describes how the property was created @interface MyManagedObject :NSManagedObject @property (nonatomic, retain) NSSet *mySet; @end @implementation MyManagedObject @dynamic mySet; @end

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• Eta/Eta-squared routines in R

  - by aL3xa

  Apart from graphical estimation of linearity (gaze-at-scatterplot method), which is utilized before applying some technique from GLM family, there are several ways to do this estimation arithmetically (i.e. without graphs). Right now, I'll focus on Fisher's eta-squared - correlation ratio: arithmetically, it's equal to squared Pearson's r (coef. of determination: R2) if relationship between two variables is linear. Hence, you can compare values of eta and r and make an assessment about type of relation (linear or not). It provides an information about percent of variance in the dependent variable explained (linearly or not) by the independent variable. Therefore, you can apply it when linearity assumptions are not met. Simply stated: is there a routine for eta/eta-squared in R?

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• Any good books out there for advanced concepts like lambdas, delegates, events etc?

  - by they_soft

  I've read about these features but I don't think I've seen enough to consistently apply them in my coding, eg "This would be better done with a delegate than with my other, outdated approach". I know what they do, but I want more examples of use cases, or want some heuristic to help me think in terms of such features. All the books I've seen either focus only on the basics or just mention the features as part of the language. Is there any book out there that deals with this? Preferably C# or language agnostic.

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• Generating a scalogram of a signal

  - by Goz

  Hi there, I'm trying to build a scalogram view for my app to see whether there is relevant information we can retrieve from a wavelet transform as opposed to using a spectograms to see what can be retrieved via an FFT. So far I can take a wave form and I can perform the forward wavelet transform on it. However I am lost at the next step. How do I turn this information into power/energy information? I have a set of wave forms at different frequencies but I have, as I say, no frequency information. Can anyone tell me what the next step is for turning this transformed data into a scalogram? Any help would be much appreciated because my google skills are failing me!

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• Convert svn repository to hg - authentication fails

  - by Kim L

  I'm trying to convert an existing svn repository to a mercurial repo with the following command hg convert <repository> <folder> My problem is that the svn repository's authentication is done with p12 certificates. I'm a bit lost on how to configure the certificate for the hg client so that I can pull the svn repo and convert it. Currently, if I try to run the above command, I get initializing destination hg-client repository abort: error: _ssl.c:480: error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure In other words, it cannot find the required certificate. The question is, how do I configure my hg client so that it can use my certificate? I'm using the command line hg client on linux.

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• UI Controls layer on top of operating system.

  - by Mason Blier

  I'm kind of curious about what layer writing a UI platform to the level of Win32 or the X Windowing System would fall in the grand scheme of an operating system. What layers below do they primarily make use of, is it heavily based on direct communication with the graphics card driver (I can't imagine going though a rendering pipeline like OpenGL for this), or is there a graphical platform as part of the operating system which extracts this out a little more. I'm also interested in the creation of shells and the like, and I"m particularly curious as to how people go about creating alternative shells for windows, what do people look for when figuring out what methods to call or what to hook into, etc? I guess I'm fairly lost at these concepts and finding it difficult to find documentation on them. I was initially excited to have taken Operating Systems in college but it was all low level resource management stuff. Thanks all, Mason

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