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• Linear complexity and quadratic complexity

  - by jasonline

  I'm just not sure... If you have a code that can be executed in either of the following complexities: A sequence of O(n), like for example: two O(n) in sequence O(n²) The preferred version would be the one that can be executed in linear time. Would there be a time such that the sequence of O(n) would be too much and that O(n²) would be preferred? In other words, is the statement C x O(n) < O(n²) always true for any constant C? Why or why not? What are the factors that would affect the condition such that it would be better to choose the O(n²) complexity?

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• Python: Split by 1 or more occurrences of a delimiter

  - by Adam Matan

  Hi, I have a formatted string from a log file, which looks like: >>> a="test result" That is, the test and the result are split by some spaces - it was probably created using formatted string which gave test some constant spacing. Simple splitting won't do the trick: >>> a.split(" ") ['test', '', '', '', ... '', '', '', '', '', '', '', '', '', '', '', 'result'] split(DELIMITER, COUNT) cleared some unnecessary values: >>> a.split(" ",1) ['test', ' result'] This helped - but of course, I really need: ['test', 'result'] I can use split() followed by map + strip(), but I wondered if there is a more Pythonic way to do it. Thanks, Adam

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• Using info.plist for storing target-specific values for a multi-target app

  - by andybee

  I have a multi-target iPhone app which currently includes a header file with constant definitions that are conditionally included at build time depending on which target is being built. However, I was wondering if it might be better to instead include this information in the info.plist for the build, as this generally holds target-specific meta, so logically seems more appropriate. Therefore, my questions are: Is it acceptable to include custom (non-Apple defined) keys in the info.plist file? Is this a suitable place to include meta for the app which changes between targets?

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• How to distribute email's delivery between 2 or more servers

  - by user181186

  We provide Email Marketing service through our online App. We have about 30 customers. And each one has it's own mailling list (5k to 20k emails each). What we really want is to distribute email's delivery between 2 or more servers. I was wondering What kind of aproach/solutions MailChimp , Constant Contact uses to provide a great service ? use many servers ? many IPs ? Our spam policy suspends ANY user/customer that gets 10% bounced .

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• How can I create a JTable where the first column is always in the JScrollPane viewport?

  - by voodoogiant

  What's the best way to set up a table in a JScrollPane such that the first column is always on the screen in the same position regardless of horizontal scrolling and overlaps columns that pass underneath? When the scrollbar is at the farthest left, the columns look normal, but as the user scrolls to the right, the secondary columns (2 and on) move underneath the first until the last column appears on the far right of the viewport? I found a sample taken from Eckstein's "Java Swing" book that sort of does this, but it doesn't allow resizing of the first column. I was thinking of some scheme where one JPanel held a horizontal struct and a table holding the secondary columns and another JPanel which floated over them (fixed regardless of scrolling). The struct would be to keep the viewport range constant as the first column floated around. Ideally I could do it with two tables using the same model, but I'm not sure if the whole idea is a naive solution.

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• Break NSString using an NSString, get everything after the string that was used to break/separate.

  - by Cole

  I'm trying to get the DOE,JOHN from the below NSString: IDCHK9898960101DL00300171DL1ZADOE,JOHN I was trying to split the string on 1ZA, as that will be constant. Here's what I've tried so far, but it's giving me the opposite of what I'm looking for: NSString *getTheNameOuttaHere = @"IDCHK9898960101DL00300171DL1ZADOE,JOHN"; // scan for "1ZA" NSString *separatorString = @"1ZA"; NSScanner *aScanner = [NSScanner scannerWithString:getTheNameOuttaHere]; NSString *thingsScanned; [aScanner scanUpToString:separatorString intoString:&thingsScanned]; NSLog(@"container: %@", thingsScanned); Output: container: IDCHK9898960101DL00300171DL Any help would be great! Thanks!

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• Code to apply expression tree directly to List

  - by Gamma Vega

  Is there a method call in Linq that will apply a expression tree directly on a List<V>? For instance, if I have a expression tree that is built on Order type, and i have a collection of List<Order> items on which i need to apply this expression. I am looking something similar to: class OrderListStore : IQueryable<V>, <other interfaces required to implement custom linq provider> { List<Order> orders; public Expression Expression { get { return Expression.Constant(this); } } IEnumerator<V> IEnumerable<V>.GetEnumerator() { //Here I need to have a method that will take the existing expression //and directly apply on list something like this .. Expression.Translate(orders); } } Any help in this regard is highly appreciated.

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• Help needed inorder to avoid recursion

  - by Srivatsa

  Hello All I have a method, which gives me the required number of Boxes based on number of devices it can hold.Currently i have implemented this logic using recursion private uint PerformRecursiveDivision(uint m_oTotalDevices,uint m_oDevicesPerBox, ref uint BoxesRequired) { if (m_oTotalDevices< m_oDevicesPerBox) { BoxesRequired = 1; } else if ((m_oTotalDevices- m_oDevicesPerBox>= 0) && (m_oTotalDevices- m_oDevicesPerBox) < m_oDevicesPerBox) { //Terminating condition BoxesRequired++; return BoxesRequired; } else { //Call recursive function BoxesRequired++; return PerformRecursiveDivision((m_oTotalDevices- m_oDevicesPerBox), m_oDevicesPerBox, ref BoxesRequired); } return BoxesRequired; } Is there any better method to implement the same logic without using recursion. Cos this method is making my application very slow for cases when number of devices exceeds 50000. Thanks in advance for your support Constant learner

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• error CS0133: Assigning the result of a function to a const in C#.net

  - by Greg

  Trying to tidy up scope and avoid possible multiple calls to RegisterWindowMessage. Currently have a class used once with the following member [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] static extern int RegisterWindowMessage(string lpString); private int m_message = RegisterWindowMessage("MY_MSG"); As we only have one instance this seems ok, but think it would be more tidy to use. With my basic C# understanding this should call RegisterWindowMessage and assign the result to int and not allow it to change. private const int message = RegisterWindowMessage("MY_MSG"); however attempting to do so leads to a error CS0133: The expression being assigned to 'someclass.messageEvent' must be constant so now I'm confused, does this mean the function was being assigned and called each time m_message was used previously, is there something else missing?

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• Missing [mx.rpc]::IResponder

  - by Arms

  I'm trying to use the Flex 4 SDK's mx.rpc package in a Flash application. I imported Flex's rpc.swc (Adobe\Adobe Flash Builder 4\sdks\4.0.0\frameworks\libs\rpc.swc) into my project by adding it to the list in Flash's "Publish Settings/Flash/ActionScrip 3.0 Settings/Library Path". It seems like I have access to the classes, however when I compile I get this error: 1046: Type was not found or was not a compile-time constant: [mx.rpc]::IResponder. There's no location or line for the error either. Any idea how to get this to work? TIA! Notes: I'm using Flash Builder 4 and Flash CS5

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• iPhone SDK: CLocationAccuracy. What constants map to what positioning technology?

  - by buzzappsoftware

  With respect to CLocationManager docs.... Constant values you can use to specify the accuracy of a location. extern const CLLocationAccuracy kCLLocationAccuracyBestForNavigation; extern const CLLocationAccuracy kCLLocationAccuracyBest; extern const CLLocationAccuracy kCLLocationAccuracyNearestTenMeters; extern const CLLocationAccuracy kCLLocationAccuracyHundredMeters; extern const CLLocationAccuracy kCLLocationAccuracyKilometer; extern const CLLocationAccuracy kCLLocationAccuracyThreeKilometers; Given that, I have the following questions. What triangulation method (GPS, cell tower or wi-fi) corresponds to each accuracy level? Does iPhone SDK utilize Skyhook Wireless API? For kCLLocationAccuracyBestForNavigation, there is note stating the phone must be plugged in. Is this enforced or is it just warning the developer the battery is likely to drain quick from using the GPS receiver. Thanks in advance.

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• Header file-name as argument

  - by Alphaneo

  Objective: I have a list of header files (about 50 of them), And each header-file has few arrays with constant elements. I need to write a program to count the elements of the array. And create some other form of output (which will be used by the hardware group). My solution: I included all the 50 odd files and wrote an application. And then I dumped all the elements of the array into the specified format. My environment: Visual Studio V6, Windows XP My problem: Each time there is a new set of Header files, I am now changing the VC++ project settings to point to the new set of header files, and then rebuild. My question: A bit in-sane though, Is there any way to mention the header from some command line arguments or something? I just want to avoid re-compiling the source every time...

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• Is there a way to circumvent Python list.append() becoming progressively slower in a loop as the lis

  - by Deniz

  I have a big file I'm reading from, and convert every few lines to an instance of an Object. Since I'm looping through the file, I stash the instance to a list using list.append(instance), and then continue looping. This is a file that's around ~100MB so it isn't too large, but as the list grows larger, the looping slows down progressively. (I print the time for each lap in the loop). This is not intrinsic to the loop ~ when I print every new instance as I loop through the file, the program progresses at constant speed ~ it is only when I append them to a list it gets slow. My friend suggested disabling garbage collection before the while loop and enabling it afterward & making a garbage collection call. Did anyone else observe a similar problem with list.append getting slower? Is there any other way to circumvent this?

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• Convert Option[Object] to Option[Int] Implicitly

  - by wheaties

  I'm working with legacy Java code which returns java.lang.object. I'm passing it into a function and I'd like to do some implicit conversions as such: implicit def asInt( _in:Option[Object] ) = _in asInstanceOf[ Option[Int] ] implicit def asDouble( _in:Option[Object] = _in asInstanceOf[ Option[Double] ] private def parseEntry( _name:String, _items:Map[String,Object] ) = _name match{ case docName.m_Constants => new Constants( _items get( Constants m_Epsilon ), _items get( Constant m_Rho ), _items get( Constants m_N ) ) Technically it goes on but I keep getting the same errors: expected Int, Option[Object] found. How have I done my implicits wrong? I was hoping it would do the transformation for me instead of me having to write "asInstanceOf" each and every time.

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• Convet long/lat to pixel x/y on a given picure.

  - by kalininew

  I have a city "map" (for example - Moscow). She in accuracy repeats the contours the given city in google maps (that is it is copied from google maps and it is a little processed, but the sense remained the same). Also I have object co-ordinates in a city (in co-ordinates of google). Problem: how to translate google co-ordinates to the co-ordinates of my picture (that is in pixels on OX and OY on a picture). That is I receive google-co-ordinates and it is necessary for me to draw this point on my picture. I know that on small scales (for example on city scales) it to make simply enough (it is necessary to learn what google-co-ordinates has one of picture corners, then to learn "price" of one pixel in google-co-ordinates on a picture on axes OX and OY separately). But on the big scales (country scale) "price" of one pixel will be not a constant, and will vary strongly enough and the method described above cannot be applied. How to solve a problem on country scales?

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• Android getWifiState to String

  - by ahsteele

  I am attempting to get the string representation of an Android device's current WiFi state. I am using the getWifiState() method of the WiFiManager and am getting an integer returned depending on the current state. This makes total sense as getWifiState() is supposed to return an integer. The method's documentation indicates that the possible return values translate to one of the following constant values 0 WIFI_STATE_DISABLING 1 WIFI_STATE_DISABLED 2 WIFI_STATE_ENABLING 3 WIFI_STATE_ENABLED 4 WIFI_STATE_UNKNOWN Is there an easy way to translate the integer returned from getWiFiState() to a string representation? I've looked at getIntExtra but am unsure of its use.

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• Should one use < or <= in a for loop

  - by Eugene Katz

  If you had to iterate through a loop 7 times, would you use: for (int i = 0; i < 7; i++) or: for (int i = 0; i <= 6; i++) There are two considerations: performance readability For performance I'm assuming Java or C#. Does it matter if "less than" or "less than or equal to" is used? If you have insight for a different language, please indicate which. For readability I'm assuming 0-based arrays. UPD: My mention of 0-based arrays may have confused things. I'm not talking about iterating through array elements. Just a general loop. There is a good point below about using a constant to which would explain what this magic number is. So if I had "int NUMBER_OF_THINGS = 7" then "i <= NUMBER_OF_THINGS - 1" would look weird, wouldn't it.

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• Resize a WPF window, but maintain proportions?

  - by rathkopf

  I have a user resizable WPF Window that I want to constrain the resizing so the aspect ratio of the window stays constant. Ideally I would like to constrain mouse location when the window is being resized by dragging a corner to positions that maintain the proper aspect ration. If an edge is resized with the mouse, the other dimension should change at the same time. Is there a simple way to do this or a good on-line example that anyone knows of? If no better solutions come up, I'll post what I've done after I've refined it a bit.

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• VS 2008 SP1 text editor flickering over remote desktop connection

  - by AltairDusk

  I am connecting from a Windows 7 x64 machine to my dev machine running Windows XP SP3 using the built in remote desktop client. For most apps it works fine with no problems, for Visual Studio whenever I am typing the entire text editor keeps redrawing. I stumbled across this question: http://stackoverflow.com/questions/873849/vs-2008-sp1-over-remote-desktop-constant-repainting and I have tried all of the suggestions in it to no effect, including resetting all VS settings back to default then disabling the suggested settings. Has anyone found a reliable solution to this? I feel like I'm going insane with the screen constantly refreshing when I'm working from home. Some additional information: Remote Desktop is set to run at 1680x1050, 15bit color, Low-speed broadband for the experience setting with all but Visual styles and Persistent bitmap caching unchecked. Visual Studio 2008 Team System is running on the dev machine with Service Pack 1 and Power Commands installed.

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• See return value in C#

  - by Snake

  Hi, Consider the following piece of code: As you can see we are on line 28. Is there any way to see the return value of the function at this point, without letting the code return to the caller function? Foo.Bar() is a function call which generates a unique path (for example). So it's NOT constant. In VB.NET it's possible by entering the function's name in the Watch, which will then threat it as a variable. But in C# this is not possible, any other tips? PS: rewriting is not an option.

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• C++ template partial specialization error

  - by JP19

  Hi, The following code is giving me a compilation error: class Q64 is not a valid type for a template constant parameter template<int GRIDD, class T> INLINE T grid_residue(T amount) { T rem = amount%(GRIDD); if (rem > GRIDD/2) rem -= GRIDD; return rem; } template<int GRIDD, Q64> INLINE Q64 grid_residue(Q64 amount) { return Q64(grid_residue<GRIDD, int64_t>(to_int(amount))); } Whats wrong? I am trying to specialize grid_residue for class Q64. thanks

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• Setting the background colour/highlight colour for a given string range using Core Text

  - by Jasarien

  I have some text laid out using Core Text in my iPhone app. I'm using NSAttributedString to set certain styles within the text for given ranges. I can't seem to find an attribute for setting a background / highlight colour, though it would seem it is possible. I couldn't find an attribute name constant that sounded relevant and the documentation only lists: kCTCharacterShapeAttributeName kCTFontAttributeName kCTKernAttributeName kCTLigatureAttributeName kCTForegroundColorAttributeName kCTForegroundColorFromContextAttributeName kCTParagraphStyleAttributeName kCTStrokeWidthAttributeName kCTStrokeColorAttributeName kCTSuperscriptAttributeName kCTUnderlineColorAttributeName kCTUnderlineStyleAttributeName kCTVerticalFormsAttributeName kCTGlyphInfoAttributeName kCTRunDelegateAttributeName Craig Hockenberry, developer of Twitterrific has said publicly on Twitter that he uses Core Text to render the tweets, and Twitterrific has this background / highlight that I'm talking about when you touch a link. Any help or pointers in the right direction would be fantastic, thanks. Edit: Here's a link to the tweet Craig posted mentioning "Core text, attributed strings and a lot of hard work", and the follow up that mentioned using CTFrameSetter metrics to work out if touches intersect with links.

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• Timeline graph - how to handle "time gaps"?

  - by ebae

  I've been working with Google chart API and annotated timeline. Drawing graphs is fine. I have no problem. However, I need to draw a timeline graph for share prices. And as you may know, share prices are meaningful only between certain times (e.g. from 10AM to 4PM, when the market opens and closes). How do I change the Google timeline graph so that on X-Axis, the range is from 10AM-4PM? Right now, it just draws a long constant line between 4PM till 10AM next day before prices start to move again. Man, I hope that makes sens. (Google finance chart seems to do it). Thank you SO much for whoever can answer. You are a CHAMPION!

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• Matlab: how do I force ode45 to take steps of exactly 0.01 on the T axis?

  - by Gravitas

  I'm using Matlab to solve a differential equation. I want to force ode45 to take constant steps, so it always increments 0.01 on the T axis while solving the equation. How do I do this? ode45 is consistently taking optimized, random steps, and I can't seem to work out how to make it take consistent, small steps of 0.01. Here is the code: options= odeset('Reltol',0.001,'Stats','on'); %figure(1); %clf; init=[xo yo zo]'; tspan=[to tf]; %tspan = t0:0.01:tf; [T,Y]=ode45(name,tspan,init,options);

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• A cross between std::multimap and std::vector?

  - by Milan Babuškov

  I'm looking for a STL container that works like std::multimap, but has constant access time to random n-th element. I need this because I have such structure in memory that is std::multimap for many reasons, but items stored in it have to be presented to the user in a listbox. Since amount of data is huge, I'm using list box with virtual items (i.e. list control polls for value at line X). As a workaround I'm currently using additional std::vector to store "indexes" into std::map, and I fill it like this: std::vector<MMap::data_type&> vec; for (MMap::iterator it = mmap.begin(); it != mmap.end(); ++it) vec.push_back((*it).second); But this is not very elegant solution. Is there some such containter?

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