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• How to get the data for intra-day candlestick charts for stocks on eg Nasdaq

  - by Chris

  Hi, For a learning exercise, i'm wanting to create candlestick (stock) graphs for stocks using zedgraph. Now on google finance, i can get daily open-high-low-close data which is perfect for making these graphs, but i'm wanting to create intra-day graphs, eg open-high-low-close data for an hour (or 5 mins, or 1 min even). Is there any way to get that kind of data without having to subscribe to any expensive service? I've heard opentick mentioned in an old SO question, but their site is defunct now. I was thinking of polling google finance once a minute to get the latest stock price, then with an hour's worth of 60 prices, i could then roughly calculate the open-high-low-close, but this is a bit of an estimation and i'm open to other suggestions. Cheers all.

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• AttributeError while adding colorbar in matplotlib

  - by bgbg

  The following code fails to run on Python 2.5.4: from matplotlib import pylab as pl import numpy as np data = np.random.rand(6,6) fig = pl.figure(1) fig.clf() ax = fig.add_subplot(1,1,1) ax.imshow(data, interpolation='nearest', vmin=0.5, vmax=0.99) pl.colorbar() pl.show() The error message is C:\temp>python z.py Traceback (most recent call last): File "z.py", line 10, in <module> pl.colorbar() File "C:\Python25\lib\site-packages\matplotlib\pyplot.py", line 1369, in colorbar ret = gcf().colorbar(mappable, cax = cax, ax=ax, **kw) File "C:\Python25\lib\site-packages\matplotlib\figure.py", line 1046, in colorbar cb = cbar.Colorbar(cax, mappable, **kw) File "C:\Python25\lib\site-packages\matplotlib\colorbar.py", line 622, in __init__ mappable.autoscale_None() # Ensure mappable.norm.vmin, vmax AttributeError: 'NoneType' object has no attribute 'autoscale_None' How can I add colorbar to this code? Following is the interpreter information: Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>>

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• Eclipse/adb error message in Vista "Failed to parse the output of adb version"

  - by watchman317

  I am trying to learn Android development, so I downloaded Eclipse Galileo and the Android SDK. However, whenever I start Eclipse, I get the error message "Failed to parse the output of adb version." In the Console/DDMS pane, the debug output reads: [2010-06-07 20:15:13 - ddms]Failed to reopen debug port for Selected Client to: 8700 [2010-06-07 20:15:13 - ddms]Address family not supported by protocol family: bind java.net.SocketException: Address family not supported by protocol family: bind at sun.nio.ch.Net.bind(Native Method) at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source) at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source) at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source) at com.android.ddmlib.MonitorThread.reopenDebugSelectedPort(Unknown Source) at com.android.ddmlib.MonitorThread.run(Unknown Source) [2010-06-07 20:15:17 - adb]Failed to parse the output of 'adb version' I am running Eclipse Galileo, have the most recent Android SDK downloaded, and am running Windows Vista 32-bit SP2. I am sure that the Android SDK path is correct and that all the files are there. I would appreciate any assistance anyone could provide. P.S.--If anyone could direct me to any useful Android development resources, I would appreciate it

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• WPF Keyboard Remapping

  - by m1dst

  Hello, I am trying to remap the input of a textbox. For example. If a user enters a N then I would like to change it to a 9. I thought it might be best to try and catch it in the PreviewKeyDown event although I will also need to process paste attempts (I can solve that bit I think). Is PreviewKeyDown a good place to start? If so, how do I send the replacement key. I know that e.Handled = true will stop the original key being processed. Thanks.

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• Writing an Iron Python debugger

  - by Kragen

  As a learning exercise I'm writing myself a simple extension / plugin / macro framework using IronPython - I've gotten the basics working but I'd like to add some basic debugging support to make my script editor easier to work with. I've been hunting around on the internet a bit and I've found a couple of good resources on writing managed debuggers (including Mike Stall's excellent .Net Debugging blog and the MSDN documentaiton on the CLR Debugging API) - I understand that IronPython is essentially IL however apart from that I'm a tad lost on how to get started, in particular: Are there any significant differences between debugging a dynamic language (such as IronPython) to a static one (such as C#)? Do I need to execute my script in a special way to get IronPython to output suitable debugging information? Is debugging a script running inside the current process going to cause deadlocks, or does IronPython execute my script in a child process? Am I better off looking into how to produce a simple C# debugger first to get the general idea? (I'm not interested in the GUI aspect of making a debugger for now - I've already got a pretty good idea of how this might work)

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• Learn MacRuby or Objective-C?

  - by MaxD

  Well, my fisrt question was a bit too general so i ll try again and hope this one is better. The way i see it is: Ruby-MacRuby or IronRuby or Rails Obj-c-Mac Development So Ruby has clearly more potential in desktop and web platforms and now with MacRuby, OSX native (and commercial) apps are on the way. If i get it wrong please correct me. For me that i will do a fresh start should i go with the modern Ruby or start learning c+obj-c? Will a newcomer benefit much (in learning & coding time, frustration, complexity) by learning/using macruby for osx apps rather objective-c? Or its pretty much the same? I hope some day to hang around here and help others.

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• Freehand drawing with Quartz 2D

  - by qutaibah

  I am trying to develop a simple freehand-drawing app for red-marking some of my images. Below is a method that is called from within the drawRect. I want to ask if there is a way to avoid add the path every time the path is redrawn? Also, the way the draw method is set up, the drawing gets a bit slow and choopy after a few seconds. How can I improve the smoothness of the drawn path? thanks -(void)freehandDraw:(CGContextRef)context inRect:(CGRect)rect { CGPathAddLineToPoint( path, NULL, drawTip.x, drawTip.y); CGContextAddPath( context, path); CGContextStrokePath(context); } // method

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• Export JPG out of Dicom File With mDCM

  - by Ross Peoples

  Hello, I'm using mDCM with C# to view dicom tags, but I'm trying to convert the pixel data to a Bitmap and eventually out to a JPG file. I have read all of the posts on the mDCM Google Group on the subject and all of the code examples either don't work or are missing important lines of code. The image I am working with is a 16 bit monochrome1. I have tried using LockBits, SetPixel, and unsafe code in order to convert the pixel data to a Bitmap but all attempts fail. Does anyone have any code that could make this work. Thanks in advance P.S. Before anyone suggests trying something else like ClearCanvas, know that mDCM is the only library that suits my needs and ClearCanvas is WAY too bloated for what I need to do.

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• chat application: pubsubhubbub vs xmpp

  - by sofia

  I'm unsure on the best stack to build a chat application. Currently I'm thinking of two main options: facebook tornado cons: does not use the main chat protocol xmpp but pubsubhubbub pros: i really like its simplicity for development (webserver + webframework); pubsubhubbub also seems simpler as a protocol than xmpp; and i know python xmpp + bosch, punjab, ejabberd cons: don't know erlang; overall seems a bit harder to develop pros: uses xmpp protocol The chat app will need to have the following: Private messages Public rooms Private rooms Chat history for rooms (not forever, just the last n messages) html embedding url to chat room Both options seem scalable so that's not really my worry (we're thinking of running the app in amazon's ec2 as well). I know there's a project that builds a xmpp server using tornado but it's not ready for production use and our deadline isn't that big. Basically my main worry is ease of development vs somehow regretting later using pubsubhubbub to develop a chat app but I read somewhere that PubSubHubbub might eventually replace XMPP as REST replaced SOAP - so what do you think?

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• SSRS 2008 + SSL displays 404 not found

  - by Matt

  Hi, I have SQL reporting services configured to use a secure certificate and when I visit both Reports and ReportManager I get a 404 not found error. The reporting services logs do not contain any error information. I am a bit at a loss to know where to start to diagnose this problem, especially as SSRS is not using IIS. I created the SSL binding using the Reporting Services Configuration Manager; IP Address: (All IPv4) SSL Port: 443 Certificate: {the certicate was present in the drop down list} URL: https://mydomain:444/Reports What can I check to get this working? Thanks

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• Are the svn ruby bindings provided as a gem?

  - by user30997

  I see a couple dozen gems that relate to svn, but what little documentation I can find on any of them shows that they are command-line wrappers and misc helpers. (svn-command, svn-hooks, etc.) I've seen code in the wild that does things like: require 'svn/core' and SVN.Repos.add(...), but the author of that module pulled his svn ruby tools via apt-get. This would not be an option for me, as I'm developing a windows/osx tool. Which gem am I after? From there, I'm happy to dig through code in lieu of documents, but with a call to gem query --name-matches svn --remote returning about 30 hits, I need to narrow it down a bit first.

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• Grails Shiro plugin : confirming my understanding

  - by bsreekanth

  I'm bit vague about how to start using the shiro plugin, after reading few documents. I decided against Nimble, as it comes with few tables and UI plugins. I setup shiro plugin with wildcard realm, with my own tables. I may use permission based (rather tan role based) access control as it scales well. Now, the steps for it. assign the permission string to the subject, and save it in the db check the permission through isPermitted, hasPermission (or relevant tags in GSP). Now, 1. when to use the accesscontrol through filter? 2. is there a closure injected into the controller where I can define the permission for the actions in it? 3. How do I create a typical access control scenario like only the creator of (something, a post etc) can delete it? thanks a lot.. Babu.

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• What AMF Servers Support Remote Shared Objects?

  - by GrayB

  Greetings. I'm planning on building a Flex based multiplayer game, and I'm researching what will be required for the server end. I have PHP experience, so I started looking at ZendAMF. Now in this game, I'll need the concept of rooms, and real time updates to clients in those rooms, so it looks like I'll be using remote shared objects (correct, yes?). I'm not seeing where ZendAMF can support this. So I found this page: http://arunbluebrain.wordpress.com/2009/03/04/flex-frameworks-httpcorlanorg/ It seems to indicate that ZendAMF isn't going to do what I want. WebORB for PHP seems to be the only PHP based solution that does messaging, but on that page it doesn't mention "real-time" next to it like the Java based ones below it do. What should I be looking at for the server piece with my requirements? Do I need to make the jump to something like BlazeDS and try to pick up a bit of Java knowledge? Thanks.

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• Tricky model inheritance - Django

  - by RadiantHex

  Hi folks, I think this is a bit tricky, at least for me. :) So I have 4 models Person, Singer, Bassist and Ninja. Singer, Bassist and Ninja inherit from Person. The problem is that each Person can be any of its subclasses. e.g. A person can be a Singer and a Ninja. Another Person can be a Bassist and a Ninja. Another one can be all three. How should I organise my models? Help would be much appreciated!

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• Linq2XML not getting content of a node that contains html tags

  - by Dante

  Hi, I have an XML file that I'm trying to parse with Linq2XML. One of the nodes contains a bit of html, that I cannot retrieve. The XML resembles to: <?xml version="1.0" encoding="ISO-8859-1"?> <root> <image><img src="/Images/m1cznk4a6fh7.jpg" /></image> <contentType>Banner</contentType> </root> The code is: XDocument document = XDocument.Parse(content.XML); XElement imageElement = document.Descendants("image").SingleOrDefault(); image = imageElement.Value; // Doesn't get the content, while if I specify .Descendants("contentType") it works Any ideas? Thank you in advance

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• Python-MySQLdb problem: wrong ELF class: ELFCLASS32

  - by jsalonen

  As part of trying out django CMS (http://www.django-cms.org/), I'm struggling with getting Python-MySQLdb to work (http://pypi.python.org/pypi/MySQL-python/). I have installed Django CMS and all of its dependencies (Python 2.5, Django, django-south, MySQL server) I'm trying out the example code within Django CMS code with MySQL as chosen database type When I execute python manage.py syncdb, the following error occurs: django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: /root/.python-eggs/MySQL_python-1.2.3c1-py2.5-linux-i686.egg-tmp/_mysql.so: wrong ELF class: ELFCLASS32 I have been able to trace the problem specifically to python-mySQLdb (as also visible in the stack trace). Other than that, I am completely puzzled. I don't have a clue what ELFCLASS32 means, or what ELF class is anyway. I suspect that this error could have something to do with the fact that I am running 64-bit version of Debian 5 (on a VPS). Any good ideas how to troubleshoot?

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• Asp.net RenderControl method not rendering autopostback for dropdownlist

  - by Tanya

  Hi all, i am bit confused as to why asp.net does not render a dropdownlist with the autopostback property set to true when using the RenderControl method. eg Dim sw As New IO.StringWriter Dim tw As New HtmlTextWriter(sw) Dim table As New Table table.Rows.Add(New TableRow) Dim tr As TableRow = table.Rows(0) tr.Cells.Add(New TableCell) Dim tc As TableCell = tr.Cells(0) Dim ddlMyValues As New DropDownList ddlMyValues.ID = "ddl1" ddlMyValues.Items.Add("Test1") ddlMyValues.Items.Add("Test2") ddlMyValues.Items.Add("Test3") ddlMyValues.AutoPostBack = True tc.Controls.Add(ddlMyValues) table.RenderControl(tw) Debug.WriteLine(sw.ToString) my output renders the dropdown list without the onchange="javascript:setTimeout('__doPostBack(\ddl1\',\'\')', 0)" that is generated by asp.net when using the dropdownlist normally. Is there a work around to this?

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• [ASP.NET] Odd HttpRequest behaviour

  - by barguast

  I have a web service which runs with a HttpHandler class. In this class, I inspect the request stream for form / query string parameters. In some circumstances, it seemed as though these parameters weren't getting through. After a bit of digging around, I came across some behaviour I don't quite understand. See below: // The request contains 'a=1&b=2&c=3' // TEST ONLY: Read the entire request string contents; using (StreamReader sr = new StreamReader(context.Request.InputStream)) { contents = sr.ReadToEnd(); } // Here 'contents' is usually correct - containing 'a=1&b=2&c=3'. Sometimes it is empty. string a = context.Request["a"]; // Here, a = null, regardless of whether the 'contents' variable above is correct Can anyone explain to me why this might be happening? I'm using a .NET WebClient and UploadDataAsync to perform the request on the client if that makes any difference. If you need any more information, please let me know.

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• Sharing application link via the same application, iphone

  - by Nithin

  Possible duplicate: How can i give app store link in my apps before approving another apps linking to an app on the Itunes store How to link to apps on the app store Hi all, I'm a littile bit confused. I need to provide the download link of my application (the iTunes link) inside my application. ie when the user would like to invite others via mail or some other means, have to provide the application link too with that.Is there any way to provide that before submitting the application to apple. Or i need to use the link as an update after getting my application approved by apple?

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• Jquery UI Slider - Input a Value and Slider Move to Location

  - by RobertC

  I was wondering if anyone has found a solution or example to actually populating the input box of a slider and having it slide to the appropriate position onBlur() .. Currently, as we all know, it just updates this value with the position you are at. So in some regards, I am trying to reverse the functionality of this amazing slider. One link I found: http://www.webdeveloper.com/forum/archive/index.php/t-177578.html is a bit outdated, but looks like they made an attempt. However, the links to the results do not exist. I am hoping that there may be a solution out there. I know Filament has re-engineered the slider to handle select (drop down) values, and it works flawlessly.. So the goal would be to do the same, but with an input text box. Any help would be incredible! Thanks in Advance!! Robert

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• use jsonp to get xml cross domain

  - by lmkk

  I am trying to read xml into a webpage from another server, and I assume that my problem is Same-Origin Policy, and therefore a cross domain problem. I have a bit of googling and it seems that jsonp is the way forward. Based on some examples I found here on stackoverflow and another sites, this is what I have, and it does not "hit" the server with the xml. I can view the xml in a browser. $(document).ready(function(){ $.ajax({ type: 'GET', dataType: 'jsonp', url: 'http://192.168.0.106:8111/getconfiguration?', success: function (xml) { //do stuff with received xml }}); Any suggestions? please keep in mind that I am a newbie with regards to JS / JQuery ;o)

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• Invoke or BeginInvoke cannot be called on a control until the window handle has been created.

  - by blade3

  Hi I am trying to install SQL Server 2008 Developer Edition x64 on a Windows Server 2008 VM. I run the installer for a standalone installation and this works fine for the setup support rules bit. That passes ok but then I get this error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.. BUTTONS: OK How can I resolve this? I am getting 2008 R2 CTP but this is just a CTP. My download is from DreamSpark. Thanks

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• Using AesCryptoServiceProvider in VB.NET

  - by Collegeman

  My problem is actually a bit more complicated than just how to use AES in VB.NET, since what I'm really trying to do is use AES in VB.NET from within a Java application across JACOB. But for now, what I need to focus on is the AES implementation itself. Here's my encryption code Public Function EncryptAES(ByVal toEncrypt As String, ByVal key As String) As Byte() Dim keyArray = Convert.FromBase64String(key) Dim toEncryptArray = Encoding.Unicode.GetBytes(toEncrypt) Dim aes = New AesCryptoServiceProvider aes.Key = keyArray aes.Mode = CipherMode.ECB aes.Padding = PaddingMode.ISO10126 Dim encryptor = aes.CreateEncryptor() Dim encrypted = encryptor.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length) aes.Clear() Return encrypted End Function Once back in the Java code, I turn the byte array into a hexadecimal String. Now, to reverse the process, here's my decryption code Public Function DecryptAES(ByVal toDecrypt As String, ByVal key As String) As Byte() Dim keyArray = Convert.FromBase64String(key) Dim toDecryptArray = Convert.FromBase64String(toDecrypt) Dim aes = New AesCryptoServiceProvider aes.Key = keyArray aes.Mode = CipherMode.ECB aes.Padding = PaddingMode.ISO10126 Dim decryptor = aes.CreateDecryptor() Dim decrypted = decryptor.TransformFinalBlock(toDecryptArray, 0, toDecryptArray.Length) aes.Clear() Return decrypted End Function When I run the decryption code, I get the following error message Padding is invalid and cannot be removed.

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• Macports sudo expands ~ to /var/root in python

  - by calavera

  This might be a bit dev-heavy for the site... but here goes. I installed the macports version of sudo. All is well, except for one thing. Using python 2.6 to expand ~ to the user's home directory results in a different output than the version of sudo that comes with Snow Leopard. For example consider the following python code: #expand_home_dir.py import os os.path.expanduser('~') Below are 3 different calls of the code listed above. The first call using sudo is using the Macports version because my $PATH begins with /opt/local/bin: robert$ python2.6 expand_home_dir.py /Users/robert robert$ sudo python2.6 expand_home_dir.py /var/root robert$ /usr/bin/sudo python2.6 expand_home_dir.py /Users/robert Any idea why this is happening?

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• Relating NP-Complete problems to real world problems

  - by terru

  I have a decent grasp of NP Complete problems; that's not the issue. What I don't have is a good sense of where they turn up in "real" programming. Some (like knapsack and traveling salesman) are obvious, but others don't seem obviously connected to "real" problems. I've had the experience several times of struggling with a difficult problem only to realize it is a well known NP Complete problem that has been researched extensively. If I had recognized the connection more quickly I could have saved quite a bit of time researching existing solutions to my specific problem. Are there any resources (online or print) that specifically connect NP Complete to real world instances?

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