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  • How can I compute the Big-O notation for a given piece of code?

    - by TheNew Rob Mullins
    So I just took a data structure midterm today and I was asked to determine the run time, in Big O notation, of the following nested loop: for (int i = 0; i < n-1; i++) { for(int j = 0; j < i; j++2) { //1 Statement } } I'm having trouble understanding the formula behind determining the run time. I thought that since the inner loop has 1 statement, and using the series equation of: (n * (n - 1)) / 2, I figured it to be: 1n * (n-1) / 2. Thus equaling (n^2 - 1) / 2. And so I generalized the runtime to be O(n^2 / 2). I'm not sure this is right though haha, was I supposed to divide my answer again by 2 since j is being upped in intervals of 2? Or is my answer completely off?

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  • Java Regular Expressions

    - by david robers
    Hi All, Im struggling to understand the regex documentation. How would I find the strings that contain exactly one C in the following text: ABCCAMNL YOOBABCCA XNABCCA ZDXUABCCA TAQABCC ISABCCA REABCCA CABCAMONPT Edit: private void matchIt(String regex, ArrayList<String> d) { Pattern p = Pattern.compile("[\\w^C]"); Matcher m = p.matcher(regex); for (int i = 0; i < d.size(); i++) { p.matcher(d.get(i)); if(m.find()){ out.println(d.get(i)); } } } i have the above function and it only outputs: ABCCAMNL YOOBABCCA Why is that?

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  • Hungarian in VBA okay?

    - by KennerL90
    I don't use hungarian (str, int) prefixes in .Net, but I still find it useful in VBA, where it is more difficult to see types. Is this bad? Unnecessary? Maybe I'm missing something. I'd really appreciate any feedback. I've been wondering for a while. Thanks everybody.

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  • Is there a name for a language feature that allows assignment/creation?

    - by Alex Mcp
    This is a bit hard for me to articulate, but in PHP you can say something like: $myArray['someindex'] = "my string"; and if there is no index named that, it will create/assign the value, and if there IS an index, it will overwrite the existing value. Compare this to Javascript where today I had to do checks like so: if (!myObject[key]) myObject[key] = "value"; I know this may be a bit of a picky point, but is there a name for the ability of PHP (and many other languages) to do these checks on their own as opposed to the more verbose (read: PITA) method of Javascript?

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  • Syntax for documenting JSON structure

    - by Roman A. Taycher
    So I'm trying to document the format of the json returned by an api I am writing against and I'd like to know if there is any popular format for the documentation of json structure. Note I'm not trying to to test or validate anything, I'm just using this for documentation. Also some ways to add comments to non-constants(items always returned w/ the same value) would be nice. This the not totally thought out scheme I'm currently using: Plain names refer to identifiers or types. Some types have type-comment Strings that appear to be constant(always returned for that type of request) strings are "str" Constant Numbers would be just the number Constant null is null Booleans are true/false for constant booleans or Boolean otherwise [a,b,c] are lists with 3 items a,b,c [... ...] is a list of repeating elements of some types/constants/patterns {a:A,b:B,c:c} and {... ...} is the same for a dictionary. example: story := [header,footer] header := {"data":realHeader,"kind":"Listing"} realHeader := {"after": null, "before": null, "children": [{"data": realRealHeader, "kind": "t3"}], "modhash": ""} footer := {"data":AlmostComments,"kind":"Listing"} AlmostComments := {"data": {"after": null, "before": null, "children": comments, "modhash": ""}, "kind": "t1"} comments := [...{"data":comment, "kind":"t1"}...] realRealHeader := {"author": string, "clicked": boolean, "created": int, "created_utc": int, "domain": "code.reddit.com", "downs": int, "hidden": boolean, "id": string-id, "is_self": boolean, "levenshtein": null, "likes": null, "media": null, "media_embed": { }, "name": string-id, "num_comments": int, "over_18": false, "permalink": string-urlLinkToStoryStartingFrom/r, "saved": false, "score": int, "selftext": string, "selftext_html": string-html, "subreddit": string-subredditname, "subreddit_id": string-id, "thumbnail": "", "title": string, "ups": int, "url": "http://code.reddit.com/" } comments := { "author": string, "body": string-body_html-wout-html, "body_html": string-html-formated, "created": int, "created_utc": int, "downs": int, "id": string-id, "levenshtein": null, "likes": null, "link_id": string-id, "name": string-id", "parent_id": string-id, "replies": AlmostComments or null, "subreddit": string-subredditname, "subreddit_id": string-id, "ups": int }

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  • Is prefixing Windows Forms control names with their type OK?

    - by name
    I have seen many responses that say that prefixing variables with their type is bad, since C# is statically typed and we have Intellisense, but I find that prefixing the names of the controls is useful because I don't need to remember the name of the controls or switch to the designer frequently. For example: btnLoad // Button tbFilePath // TextBox tvFileSystem // TreeView Is this considered bad? If it is, what's the alternative?

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  • How can I avoid Excel reformatting the scientific notation numbers I enter?

    - by Diomidis Spinellis
    When I enter a number like 8230e12 into a Microsoft Excel 2000 cell, Excel changes the number I entered into 8230000000000000. (This is what I get when I press F2 to edit the cell's contents, not what Excel displays in the cell). How can I force Excel to keep the data in the format I typed it and still be able to format it and use it as a number? Displaying the cell in scientific notation is not enough, because the exponent is not the same one as the one I typed.

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  • Is do-notation specific to "base:GHC.Base.Monad"?

    - by yairchu
    The idea that the standard Monad class is flawed and that it should actually extend Functor or Pointed is floating around. I'm not necessarily claiming that it is the right thing to do, but suppose that one was trying to do it: import Prelude hiding (Monad(..)) class Functor m => Monad m where return :: a -> m a join :: m (m a) -> m a join = (>>= id) (>>=) :: m a -> (a -> m b) -> m b a >>= t = join (fmap t a) (>>) :: m a -> m b -> m b a >> b = a >>= const b So far so good, but then when trying to use do-notation: whileM :: Monad m => m Bool -> m () whileM iteration = do done <- iteration if done then return () else whileM iteration The compiler complains: Could not deduce (base:GHC.Base.Monad m) from the context (Monad m) Question: Does do-notation work only for base:GHC.Base.Monad? Is there a way to make it work with an alternative Monad class? Extra context: What I really want to do is replace base:Control.Arrow.Arrow with a "generalized" Arrow class: {-# LANGUAGE TypeFamilies #-} class Category a => Arrow a where type Pair a :: * -> * -> * arr :: (b -> c) -> a b c first :: a b c -> a (Pair a b d) (Pair a c d) second :: a b c -> a (Pair a d b) (Pair a d c) (***) :: a b c -> a b' c' -> a (Pair a b b') (Pair a c c') (&&&) :: a b c -> a b c' -> a b (Pair a c c') And then use the Arrow's proc-notation with my Arrow class, but that fails like in the example above of do-notation and Monad. I'll use mostly Either as my pair type constructor and not the (,) type constructor as with the current Arrow class. This might allow to make the code of my toy RTS game (cabal install DefendTheKind) much prettier.

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  • what are the problems in game development that requires scientific research? [on hold]

    - by Anmar
    I been into Game Development for approximately 2 years for now mostly prototype development and testing ideas. Im in a point of my carrier where I am in a need to publish a research paper I would love to start doing research about game development however my lack of experience in actual game development in a commercial set of environment brings me into Game development in stackexchange My question is for the experience game developers out there What are the problems related to software engineering that you have faced or your team faced while developing games? Example Problems ? The lack of a strong technique for Fun detection in a game in an early stage of development A strong tailored Software Development Life Cycle for game development Agile methodology as a game development methodology Narrowing the goals gap between team members (Editors, Story Designers, Programmers, 3D artists, 2D Artists) - Community Suggestions Indie game marketing requirements for success by Yakyb Any problems you could define it I would be more than happy to take it into consideration for future research. My experience and work mostly involve process related basically SDLC (Waterfall, Spiral, Agile, RUP .Etc) Thank you for any input.

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  • Scientific calculator app/site that saves calculations for Win 7?

    - by verve
    Are there any scientific calculator apps that aren't browser specific that's easy to use which displays whatever is inputted clearly and one that can be used by a keyboard only but can be used by only a mouse too? Also, I want one that saves the history of calculations and lets us paste it into a document at another time. Also, please don't recommend ones from sketchy-looking sites. Freeware or paidware. I prefer paidware if it's the only way to guarantee accurate calculations. Win 7 Pro.

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  • mrepo and grouplist/groupinstall?, mrepo not working as expected with group

    - by user52874
    All, I'm trying to set up mrepo so we can have internal repositories. After quite the slog, things seem to be working as expected EXCEPT for groups. From man createrepo: EXAMPLES Here is an example of a repository with a groups file. Note that the groups file should be in the same directory as the rpm packages (i.e. /path/to/rpms/comps.xml). createrepo -g comps.xml /path/to/rpms So here's what I'm doing: wget -c http://ftp.scientificlinux.org/linux/scientific/6/x86_64/os/repodata/comps-sl6-x86_64.xml cp comps-sl6-x86_64.xml /var/mrepo/SL6-x86_64/os/Packages/comps-sl6-x86_64.xml createrepo -g comps-sl6-x86_64.xml /var/mrepo/SL6-x86_64/os/Packages/ lots of output, no apparent errors or warnings BUT.. from a client: yum grouplist Loaded plugins: refresh-packagekit Setting up Group Process Error: No group data available for configured repositories Here's /etc/mrepo.conf: ### Configuration file for mrepo ### The [main] section allows to override mrepo's default settings ### The mrepo-example.conf gives an overview of all the possible settings [main] srcdir = /var/mrepo wwwdir = /var/www/mrepo confdir = /etc/mrepo.conf.d arch = x86_64 mailto = root@localhost smtp-server = localhost pxelinux = /usr/lib/syslinux/pxelinux.0 tftpdir = /tftpboot #rhnlogin = username:password ### Any other section is considered a definition for a distribution ### You can put distribution sections in /etc/mrepo.conf.d ### Examples can be found in the documentation. Here's /etc/mrepo.conf.d/sl6.mrepo: ### Scientific Linux 6 [SL6] name = Scientific Linux 6 release = 6 arch = x86_64 metadata = repomd repoview os = rsync://rsync.scientificlinux.org/scientific/$release/$arch/os/ updates = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/ security = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/security/ fastbugs = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/fastbugs/

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  • notation of Path to files/folders/drives that is shared on a network in windows?

    - by claws
    Hello, When some thing shared on network using windows network share option. Some people use path like \\something\something\something$ I'm don't know if this is correct way or not. but as far as I remember there is a dollar sign. Can any one please tell me. What is this notation? Where can I find more details about this? What is samba server/sharing? I don't understand when people use it. Is it something related to Linux? EDIT I'm a programmer. I guess this file sharing on network using windows uses client server architecture. I want to know what is this server on windows called? What protocol does it use? client is of course our windows explorer.exe? Which service in services.msc is responsible for this?

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  • Looking for C# framework for plotting scientific data: 2d/3d ...

    - by Ivan
    I need to visualize some scientific calculations. I generally prefer reusing code if there is already a good available instead of inventing wheels each time, that's why I am asking. I need a C# code to draw charts (just outputting a bitmap is ok) of 2d (y=f(x)) and 3d (z=f(x,y)) digital data sets (where any axis can be float, int or datetime), sometimes combined. If I go here and click 3D in the navigation bar on the left, there I can see what I need. But the cheapest version costs $759 there, looks scary for a hobby project of an east-european student :-(

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  • Is Python appropriate for algorithms focused on scientific computing?

    - by gmatt
    My interests in programming lie mainly in algorithms, and lately I have seen many reputable researchers write a lot of their code in python. How easy and convenient is python for scientific computing? Does it have a library of algorithms that compares to matlab's? Is Python a scripting language or does it compile? Is it a great language for prototyping an algorithm? How long would it take me to learn enough of it to be productive provided I know C well and OO programming somewhat? Is it OO based? Sorry for the condensed format of questions, but I'm very curious and was hoping a more experienced programmer could help me out.

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  • Looking for framework for plotting scientific data: 2d/3d ...

    - by Ivan
    I need to visualize some scientific calculations. I generally prefer reusing code if there is already a good available instead of inventing wheels each time, that's why I am asking. I need a C# code to draw charts (just outputting a bitmap is ok) of 2d (y=f(x)) and 3d (z=f(x,y)) digital data sets (where any axis can be float, int or datetime), sometimes combined. If I go here and click 3D in the navigation bar on the left, there I can see what I need. But the cheapest version costs $759 there, looks scary for a hobby project of an east-european student :-(

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  • What is the pro and cons using Heredoc Notation in your PHP ?

    - by justjoe
    i'm never see something like this before. So, it's confuse me for a while. But now i understand and use it sometimes. So, after brief experience, can anybody tell me What is the pro and cons using Heredoc Notation in your PHP ? $stringval = Personally, How do you use this PHP feature ? is it a bad way of coding or good way ?

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  • What is the purpose of "do!" notation in F#?

    - by Yacoder
    I'm a beginner in F#, so it's a simple question and maybe a duplicate, but I couldn't find the answer anywhere... I'm reading this LOGO DSL implementation and I don't understand, what is the meaning of the "do!" notation in here: this.Loaded.Add (fun _ -> async { do! Async.Sleep 200 for cmd in theDrawing do do! this.Execute(cmd) } |> Async.StartImmediate ) Can you help?

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  • Is there a literal notation for decimal in IronPython?

    - by jeroenh
    suppose I have the following IronPython script: def Calculate(input): return input * 1.21 When called from C# with a decimal, this function returns a double: var python = Python.CreateRuntime(); dynamic engine = python.UseFile("mypythonscript.py") decimal input = 100M; // input is of type Decimal // next line throws RuntimeBinderException: // "cannot implicitly convert double to decimal" decimal result = engine.Calculate(input); I seem to have two options: First, I could cast at the C# side: seems like a no-go as I might loose precision. decimal result = (decimal)engine.Calculate(input); Second option is to use System.Decimal in the python script: works, but pollutes the script, which should be understandable for my users... import clr import System def CalculateVAT(amount): return amount * System.Decimal(1.21) Is there a way to tell the DLR that the number 1.21 should be interpreted as a Decimal, much like I would use the '1.21M' notation in C#?

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  • what is order notation f(n)=O(g(n))?

    - by Lopa
    2 questions: question 1: under what circumstances would this[O(f(n))=O(k.f(n))] be the most appropriate form of time-complexity analysis? question 2: working from mathematical definition of O notation, show that O(f(n))=O(k.f(n)), for positive constant k.? My view: For the first one I think it is average case and worst case form of time-complexity. am i right? and what else do i write in that? for the second one I think we need to define the function mathematically, so is the answer something like because the multiplication by a constant just corresponds to a readjustment of value of the arbitrary constant 'k' in definition of O.

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  • In DOM is it OK to use .notation for getting/setting attributes?

    - by Ziggy
    Hi In DOM, is it OK to refer to an element's attributes like this: var universe = document.getElementById('universe'); universe.origin = 'big_bang'; universe.creator = null; universe.style.deterministic = true; ? My deep respect for objects and their privacy, and my sense that things might go terribly wrong if I am not careful, makes me want to do everything more like this: var universe = document.getElementById('universe'); if(universe.hasAttribute('origin')) then universe.origin = 'big_bang'; etc... Is it really necessary to use those accessor methods? Of course it may be more or less necessary depending on how certain I am that the elements I am manipulating will have the attributes I expect them to, but in general do the DOM guys consider it OK to use .notation rather than getters and setters? Thanks!

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