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  • How can I subsample data from a time series with LINQ to SQL?

    - by Chris Farmer
    I have a database table full of time points and experimental values at those time points. I need to retrieve the values for an experiment and create a thumbnail image showing an XY plot of its data. Because the actual data set for each experiment is potentially 100,000 data points and my image is only 100 pixels wide, I want to sample the data before creating the image. My current query (which retrieves all the data without sampling) is something simple like this: var points = from p in db.DataPoints where p.ExperimentId == myExperimentId orderby p.Time select new { X = p.Time, Y = p.Value } So, how can I best take every nth point from my result set in a LINQ to SQL query?

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  • Efficient heaps in purely functional languages

    - by Kim
    As an exercise in Haskell, I'm trying to implement heapsort. The heap is usually implemented as an array in imperative languages, but this would be hugely inefficient in purely functional languages. So I've looked at binary heaps, but everything I found so far describes them from an imperative viewpoint and the algorithms presented are hard to translate to a functional setting. How to efficiently implement a heap in a purely functional language such as Haskell? Edit: By efficient I mean it should still be in O(n*log n), but it doesn't have to beat a C program. Also, I'd like to use purely functional programming. What else would be the point of doing it in Haskell?

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  • ItemFileWriteStore: how to change the data?

    - by jeff porter
    Hi, I'd like to change the data in my dojo.data.ItemFileWriteStore. Currently I have... var rawdataCacheItems = [{'cachereq':'14:52:03','name':'Test1','cacheID':'3','ver':'7'}]; var cacheInfo = new dojo.data.ItemFileWriteStore({ data: { identifier: 'cacheID', label: 'cacheID', items: rawdataCacheItems } }); I'd like to make a XHR request to get a new JSON string of the data to render. What I can't work out is how to change the data in the "items" held by ItemFileWriteStore. Can anyone point me in the correct direction? Thanks Jeff Porter

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  • How to write a virtual conditional breakpoint in java

    - by Phuong Nguyen de ManCity fan
    I'm sorry if the question title may mis-inform you, but I cannot find a proper word to explain that. If you ever working with .NET, you would know that there is Assert class that will automatically wake up and attach debugger if necessary and then have debugger (Visual Studio) pausing at the Assert command, given the Assert command failed. Given I'm running a java program and having debugger connected, then how can I have debugger to break on certain condition without manually setup a break point? I'm expecting something like that: void doSomeThing(String x){ if (x==null) breakDebuggerNow(); }

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  • How to enforce remote gnupg signing of Mercurial repository only when new tags are created?

    - by Tim Post
    I know how to configure the Mercurial signing extension. The problem that I'm having is that I don't want to sign each individual change set, I only want to sign revisions that introduce new version tags. That's easily accomplished locally, however I can't come up with a way to enforce this on the remote server. I'd like people to continue to be able to push their changes as normal, unless adding a release tag, which should be accompanied by a signature. The end result should be that anyone cloning our repository can easily see a list of signed revisions, which point to a list of signed releases. Hopefully, I've just missed something obvious in hooklib. Has anyone else accomplished this, if so, how?

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  • How do I modify the HttpResponse object in django ?

    - by Rohit
    I need the html returned using render_to_response to be escaped. I am unable to find any suitable documentation. Can someone point in some direction ? the code is : return render_to_response(template_name, {return render_to_response(template_name, { 'form': form, redirect_field_name: redirect_to, 'site': current_site, 'site_name': current_site.name, }, context_instance=RequestContext(request)) Here I need the response html text to be escaped. I way I know is reading template file in string and escaping it with re.escape() and then rendering it. whats a cleaner and simpler way to do that ??

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  • Continuous Integration with Oracle Products

    - by Lee Gathercole
    Hi, I'm currently working on a Datawarehouse project using an Oracle Database, Oracle Data Integrator, Oracle Warehouse Builder and some Jython thrown in for good measure. All of which is held within TFS. My background is .net and prior to this project was seeing a lot of promise in CI. I'm not suggesting that the testing element of CI is feasible in this instance, but I would like to implement a stable deployment strategy. What I'm trying to understand is whether or not I can build some NANT scripts that will allow me to deploy ODI\OWB\Oracle DB code to any given environment at any point. Has anyone tried this before? Are there more appropriate tools out there that lends themselves better to this sort of toolset? Am I just a crazy horse to be evening contemplating this? Any view would be greatly appreciated. Thanks Lee

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  • What considerations need to be made when transitioning an application to support?

    - by Eric U.
    I will be taking on the role of support for a complex application that is transitioning from the development team. This application is a sharepoint solution that connects to several (7) web services. The development team is rolling off almost immediately and will be available only for small questions. I'm new to this role so I'm wondering what suggestions you have for me as I take on this large project. What are some considerations that should be made so that the transition to support is smooth and uninterupted? I've been reading the documentation but I can already see some gaps that need to be filled. The applicaiton is very (perhaps overly) configurable and there is lots of injected code. Stepping through the code is about the only way I can gain an understanding of what is actually happening. At this point I'm a little over whelmed and appreciate any suggestions or advice. Thanks!

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  • Excel VBAa: Sum invoice by client id with copying result to new worksheet

    - by Melkior
    Hi, i have strange problem doing reporting: i have numerous clients with different issued invoices. Problem comes to the point when there are invoices in minus and plus: Column A consists of client unique IDs, Column B invoice number, column C invoice amount A | B | C 0010019991 | 1800149471 | 162.00 0010019991 | 1800136388 | 162.00 0010019991 | 1600008004 | -36.00 0010021791 | 1800132148 | 162.00 0010021791 | 1800145436 | 162.00 0010021791 | 1600007737 | -12.00 0014066147 | 1800119068 | 1,684.80 0014066147 | 1800123702 | 1,684.80 0014066147 | 1600007980 | -1,300.80 0014066147 | 1600007719 | -1,286.40 I need to remove rows with negative invoices in a way that amount is summed with invoices which are not with negative amount. So that final result would look like: A | B | C 0010019991 | 1800149471 | 126.00 0010019991 | 1800136388 | 162.00 0010021791 | 1800132148 | 150.00 0010021791 | 1800145436 | 162.00 0014066147 | 1800123702 | 782.40

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  • Dynamics CRM Get Info For Customer

    - by macinjosh
    I'm working on a ASP.NET (C#) site that pulls most of its data from Dynamics CRM over SOAP using Microsoft's CrmService SDK. I'm at the point where a query has returned an entity with a property of the type Customer. I need to get the name string of that customer record, but cannot figure out how to do so. By doing a little guess work I figured out that what I have is GUID for the customer. How can I use this GUID to get the customer's name as a string? Relevant Links: CrmService Docs Customer Property Customer Class

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  • How to deploy and register a VSPackage supporting multiple versions of Visual Studio (2005, 2008, 20

    - by Steve Cadwallader
    I have an open source VSPackage that I would like to release with support for Visual Studio 2005, Visual Studio 2008, and Visual Studio 2010. I'm trying to figure out how to create the installer and how to perform the package registration with each edition of Visual Studio. The deployment research I've done indicates my best bet for an installer is a VSIX inside an MSI. The registration research I've done is a lot less clear. VSPackage registration seems to differ for every edition (VS2005 uses regpkg, VS2008 uses pkgdef, VS2010 uses VSIX). Can anyone share their experiences and/or point me towards any information about the best approach for targeting multiple versions of Visual Studio? I'm looking for the easiest implementation and preferably keeping it in a single installer if reasonably feasible. Any help would be greatly appreciated!

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  • Should I distinguish OpenIDs based on protocol prefix or not? http vs https

    - by Joannes Vermorel
    I have implemented a straightforward OpenID support for my ASP.NET app with DotNetOpenAuth. Yet I recently realized that the implementation was treating http://johndoe.example.com/ as a distinct user compared to https://johndoe.example.com. This lead to quite a few confused users. I am unsure what to do at this point. Is this a bug or a feature? Indeed, I can consider this behavior as a feature: if the user specifies the HTTPS, the user might not want the system to accept HTTP auth in the first place. On the other hand: if the user specifies HTTPS out of sheer cluelessness (the casual web visitor is clueless concerning the purpose of the "S" part), then rejecting it's authentication attempt is confusing. What is considered as the best practice?

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  • Trying to capture stage area using BitmapData

    - by Dimitree
    I am trying to grab part of stage area using BitmapData and copyPixels method: bmd = new BitmapData(stage.stageWidth, stage.stageHeight); bmdRect = new BitmapData(320, 240); rectangle = new Rectangle(360, 20, 320, 240); bmdRect.copyPixels(bmd, rectangle, new Point()); bmd.draw(bmp); bmp = new Bitmap(bmdRect); var myEncoder:JPGEncoder = new JPGEncoder(100); var byteArray:ByteArray = myEncoder.encode(bmd); The result i get is an empty .jpg I m pretty sure that the error is in the Bitmap procedure and not the saving one...

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  • WCF Host as windows service faults

    - by pdiddy
    I have this WCF service running as a window service. I have in my code that everytime it faults it will restart the service. Now I'm having the issue where the host faults, it tries to restarts, then faults again, but at some point it just stop the service. Wondering why it stop the service? Is this something handled by the OS that it detects the service has faulted a number of time within a certain time it will just stop the service because it faulted too many time ?

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  • How come BraceMatch() doesn't work when a lexer is set in wxStyledTextCtrl?

    - by George Edison
    I have the following chunk of C++ code that gets called when } is pressed: int iCurPos = GetCurrentPos(); InsertText(iCurPos,wxT("}")); int iPos = BraceMatch(iCurPos); This works fine (iPos gets the position of the matching brace) except when I call SetLexer(...) beforehand. Then it returns -1? How can I get it to work? Edit: I should point out that the above code is being called from the EVT_KEY_DOWN handler in a wxStyledTextCtrl-derived class.

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  • Multiple complete HTTP requests stuck in TCP CLOSE_WAIT state

    - by Sean Owen
    I have a Java and Tomcat-based server application which initiates many outbound HTTP requests to other web sites. We use Jakarta's HTTP Core/Client libraries, very latest versions. The server locks up at some point since all its worker threads are stuck trying to close completed HTTP connections. Using 'lsof' reveals a bunch of sockets stuck in TCP CLOSE_WAIT state. This doesn't happen for all, or even most connections. In fact, I saw it before and resolved it by making sure to set the Connection: Close response header. So that makes me think it may be bad behavior of remote servers. It may have come up again since I moved the app to a totally new service provider -- different OS, network situation. But, I am still at a loss as to what I could do, if anything, to work around this. Some poking around on the internet didn't turn up anything I'm not already doing. Just thought I'd ask if anyone has seen and solved this?

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  • PHP check if file exists on my server, based on a full URL

    - by stef
    I have an app that generates invoices in the form of PDF files stored in a directory on my server. Before mailing out this invoices I'd like to make sure that the URL (not server path) which I store in my DB does indeed point to a valid PDF file. Something could have gone wrong that wrote a value to that field in the db, but for example the filename is missing; meaning the file is not in the specified directory. AFAIK file_exists just checks server paths but not URL's. I could always store the server path too, or assemble it, but I'm wondering if i can do this check based on a full http url ending with a filename? EDIT: yeah CURL occurred to me too but doesn't that seem a bit heavy for such a simple task? Perhaps I should just store the server path too.

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  • Is there a way to get different sizes of the Windows system icons in .NET?

    - by Andrew Watt
    In particular I'd like to be able to get the small (16 x 16) icons at runtime. I tried this: new Icon(SystemIcons.Error, SystemInformation.SmallIconSize) Which supposedly "attempts to find a version of the icon that matches the requested size", but it's still giving me a 32 x 32 icon. I also tried: Size iconSize = SystemInformation.SmallIconSize; Bitmap bitmap = new Bitmap(iconSize.Width, iconSize.Height); using (Graphics g = Graphics.FromImage(bitmap)) { g.DrawIcon(SystemIcons.Error, new Rectangle(Point.Empty, iconSize)); } But that just scales the 32 x 32 icon down into an ugly 16 x 16. I've considered just pulling icons out of the VS Image Library, but I really want them to vary dynamically with the OS (XP icons on XP, Vista icons on Vista, etc.). I'm willing to P/Invoke if that's what it takes.

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  • How do you handle files that can't support concurrent edits in Mercurial?

    - by Scott Whitlock
    I'm using Mercurial with TortoiseHg. Each developer has their own repositories, and there's one central repository on the server for synchronizing our changes. (This will sound lame, but we're using it to manage the source for a legacy VB6 project. Nothing we can do about that...) As has been pointed out elsewhere, there is a big problem in VB6 with merging the .frx (form resources) files. So code changes seem to merge fine, but if two developers both make changes at the same time in the form design view, we can't merge. I'm ok with disallowing concurrent edits, but of course the whole point of Mercurial is that it's distributed so there is no option to force a file to be locked before editing. I don't believe there's a Mercurial solution for this, so I'm wondering: other developers who are using Mercurial for version control, do you have some 3rd party tool that assists with locking files for editing in the cases where it's necessary? Did we make a mistake using Mercurial instead of something like SVN?

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  • Cannot Debug Unmanaged Dll from C#

    - by JustSmith
    I have a DLL that was written in C++ and called from a C# application. The DLL is unmanaged code. If I copy the DLL and its .pdb files with a post build event to the C# app's debug execution dir I still can't hit any break points I put into the DLL code. The break point has a message attached to it saying that "no symbols have been loaded for this document". What else do I have to do to get the debugging in the dll source? I have "Tools-Options-Debugging-General-Enable only my code" Disabled. The DLL is being compiled with "Runtime tracking and disable optimizations (/ASSEMBLYDEBUG)" and Generate Debug Info to "Yes (/DEBUG)"

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  • Inheritance in Java

    - by Mandar
    Hello, recently I went through the inheritance concept. As we all know, in inheritance, superclass objects are created/initialized prior to subclass objects. So if we create an object of subclass, it will contain all the superclass information. But I got stuck at one point. Do the superclass and the subclass methods are present on separate call-stack? If it is so, is there any specific reason for same? If it is not so, why they don't appear on same call-stack? E.g. // Superclass class A { void play1( ) { // .... } } // Subclass class B extends A { void play2( ) { //..... } } Then does the above 2 methods i.e play1( ) and play2( ) appear on separate call stack? Thanks.

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  • WCF Project vs. A folder in the existing website project?

    - by user193189
    What way makes the most sense? I have a ASP.NET app... and maybe a Silverlight app in the future.. I want both to talk to web services.. At first, I like have the WCF project be by it self for the seperation.. But then I thought.. What is the point since I can just as easily have a 'WEBSERVICES' folder that contains all the .svc files and code in the EXISTING website project. ... Atleast that way.. deploying to a remote host will be a little easier since everything is in one project.. any other considerations ?

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  • Installing GDAL for Python

    - by Nate
    I am trying to install GDAL for python on a Windows XP machine (Python 2.6 currently installed) following the instructions at http://trac.osgeo.org/gdal/wiki/GdalOgrInPython (as is mirrored in a hundred other places). It says I need both the GDAL source (or Windows binary) and the python bindings. The python binding are be downloaded from the python cheeseshop (http://pypi.python.org/pypi/Python_GDAL/1.3.1). I don't see a download link on this page nor can I locate the python binding elsewhere - all instruction I can find seem to point to the same cheeseshop page. This seems like I'm either missing something embarrassingly simple or the bindings file has disappeared. Any thoughts on which it is? Thanks.

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  • importing same module more than once

    - by wallacoloo
    So after a few hours, I discovered the cause of a bug in my application. My app's source is structure like: main/ __init__.py folderA/ __init__.py fileA.py fileB.py Really, there are about 50 more files. But that's not the point. In main/__init__.py, I have this code: from folderA.fileA import * in folderA/__init__.py I have this code: sys.path.append(pathToFolderA) in folderA/fileB.py I have this code: from fileA import * The problem is that fileA gets imported twice. However, I only want to import it once. The obvious way to fix this (to me atleast) is to change certain paths from path to folderA.path But I feel like Python should not even have this error in the first place. What other workarounds are there that don't require each file to know it's absolute location?

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  • How to solve such system with given parts of it? (maple)

    - by Kabumbus
    So I had a system #for given koefs k:=3; n:=3; #let us solve system: koefSolution:= solve({ sum(a[i], i = 0 .. k) = 0, sum(a[i], i = 0 .. k)-(sum(b[i], i = 0 .. k)) = 0, sum(i^n*a[i], i = 0 .. k)-(sum(i^(n-1)*b[i], i = 0 .. k)) = 0 }); So I have a vector like koefSolution := { a[0] = 7*a[2]+26*a[3]-b[1]-4*b[2]-9*b[3], a[1] = -8*a[2]-27*a[3]+b[1]+4*b[2]+9*b[3], a[2] = a[2], a[3] = a[3], b[0] = -b[1]-b[2]-b[3], b[1] = b[1], b[2] = b[2], b[3] = b[3]} I have a[0] so I try solve({koefSolution, a[0] = 1}); why it does not solve my system for given a[0]? ( main point here is to fill koefSolution with given a[] and b[] and optimize.)

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