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  • How are certain analytics metrics (time on site, etc.) usually distributed?

    - by a barking spider
    I'm not sure if I've come to the right place to ask this question, but I'm gathering some information for a research project. We're trying to design an experiment that'll heavily involve web analytics, and I'm trying to figure out some sensible values of mean +/- standard deviation for the following visitor-level (i.e., visitor 1 spends 2 minutes on site, visitor 2 spends 1 minute -- mean 1.5 +/- 0.71...) metrics: time spent on site page views If time allowed, we would put up the sites and gather the information ourselves, but we have a grant deadline coming up. I realize that even though these the distributions of these quantities are probably going to be heavily skewed towards zero, we'll need some reasonable figures or estimates of these figures in order to do sample size calculations, etc. Anyway, I'm not sure where else I'd turn, and I certainly have had a difficult time finding these values in the prior literature. If someone could direct me to a paper with the right information, or if you have these figures on hand (perhaps taken directly from your logs!) -- that would be amazing, and I'd love to hear from you. Thanks in advance, and even though I'm not allowed to reveal too much, rest assured that this info'll be applied towards a good cause :)

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  • How to read reduce/shift conflicts in LR(1) DFA?

    - by greenoldman
    I am reading an explanation (awesome "Parsing Techniques" by D.Grune and C.J.H.Jacobs; p.293 in the 2nd edition) and I moved forward from my last question: How to get lookahead symbol when constructing LR(1) NFA for parser? Now I have such "problem" (maybe not a problem, but rather need of confirmation from some more knowledgeable people). The authors present state in LR(0) which has reduce/shift conflict. Then they build DFA for LR(1) for the same grammar. And now they say it does not have a conflict (lookaheads at the end): S -> E . eof E -> E . - T eof E -> E . - T - and there is an edge from this state labeled - but no labeled eof. Authors says, that on eof there will be reduce, on - there will be shift. However eof is for shift as well (as lookahead). So my personal understanding of LR(1) DFA is this -- you can drop lookaheads for shifts, because they serve no purpose now -- shifts rely on input, not on lookaheads -- and after that, remove duplicates. S -> E . eof E -> E . - T So the lookahead for reduce serves as input really, because at this stage (all required input is read) it is really incoming symbol right now. For shifts, the input symbols are on the edges. So my question is this -- am I actually right about dropping lookaheads for shifts (after fully constructing DFA)?

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  • Object desing problem for simple school application

    - by Aragornx
    I want to create simple school application that provides grades,notes,presence,etc. for students,teachers and parents. I'm trying to design objects for this problem and I'm little bit confused - because I'm not very experienced in class designing. Some of my present objects are : class PersonalData() { private String name; private String surename; private Calendar dateOfBirth; [...] } class Person { private PersonalData personalData; } class User extends Person { private String login; private char[] password; } class Student extends Person { private ArrayList<Counselor> counselors = new ArrayList<>(); } class Counselor extends Person { private ArrayList<Student> children = new ArrayList<>(); } class Teacher extends Person { private ArrayList<ChoolClass> schoolClasses = new ArrayList<>(); private ArrayList<Subject> subjects = new ArrayList<>(); } This is of course a general idea. But I'm sure it's not the best way. For example I want that one person could be a Teacher and also a Parent(Counselor) and present approach makes me to have two Person objects. I want that user after successful logging in get all roles that it has (Student or Teacher or (Teacher & Parent) ). I think I should make and use some interfaces but I'm not sure how to do this right. Maybe like this: interface Role { } interface TeacherRole implements Role { void addGrade( Student student, Grade grade, [...] ); } class Teacher implements TeacherRole { private Person person; [...] } class User extends Person{ ArrayList<Role> roles = new ArrayList<>(); } Please if anyone could help me to make this right or maybe just point me to some literature/article that covers practical objects design.

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  • No sound Ubuntu 12.04 through HDMI

    - by MikeMan
    Specs: Asus G73JH i7/720; ATI Mobility 5870 I have read through a lot of threads on getting HDMI sound to work and non of them have fixed my issue. Granted I am very new to Linux and know only the GUI aspect of what it does from finding similarities that Windows 7 has. I would like to become a Linux Power User and I figured this would be a good step to get started. I was able to successfully install my graphics driver and it shows in use. I connect the HDMI to my HD TV and I get no sound. I don't care about auto switch for sound, that would be great but not necessary. I just want my sound to work through the HDMI. What I have tried: Changed GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1" pact set-card-profile 0 output:hdmi-surround Failure: no such entity Sound Settings: Right-click Sound indicator ? Sound Settings ? Output Tab, and set Digital Output (S/PDIF) Built in Audio Speakers Built in Audio I only get 2 settings. If I right-click the area below those 2 in the "play sound through" box, I get no "show hidden devices". I am also doing all this with the HDMI connected to eliminate any possibility for error.

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  • ATI HD5450 w/ Ubuntu 14?

    - by Oliwb
    So, I'm running Ubuntu 12.04 right now. Last night I realised that I'm way behind as we're up to 14! Decided to run the updater and figured I'd take the path of least resistance (but lengthy choice) of going 12.04 - 12.10 - 13.xx - 14.xx. So I download the first packet and then get an error message about my graphics card perhaps not working in 12.10. Now part of the reason I was looking to upgrade is because I get (and have always had) this strange occasional flickering - now that I have two screens it's just on the second monitor.....oddly this is not the same port that was giving issues before). The graphics card is an ATI Radeon HD5450 and I have the Catalyst (I think it's 13 or 14) driver installed - last night. It could be that the graphics card has never worked properly...I bought the PC new and with an "upgraded" video card and it's always suffered with this flicker. I just figured that the drivers weren't right or something. So I have 3 questions: 1) is my video card broken or is the driver letting it down and causing the flicker? 2) will it be able to handle the upgrade to 14 via 13? Or should I cut my losses and get something newer? 3) if I should get something newer....what should I get ( Thanks in advance....

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  • opengl 3d point cloud render from x,y,z 2d array with texture

    - by user1733628
    Need some direction on 3d point cloud display using openGl in c++ (vs2008). I am brand new to openGl and trying to do a 3d point cloud display with a texture. I have 3 2D arrays (each same size 1024x512) representing x,y,z of each point. I think I am on the right track with glBegin(GL_POLYGON); for(int i=0; i<1024; i++) { for(int j=0; j<512; j++) { glVertex3f(x[i][j], y[i][j], z[i][j]); } } glEnd(); Now this loads all the vertices in the buffer (i think) but from here I am not sure how to proceed. Or I am completely wrong here. Then I have another 2D array (same size) that contains color data (values from 0-255) that I want to use as texture on the 3D point cloud and display. I understand that this maybe a very basic opengl implementation for some but for me this is a huge learning curve. So any pointers, nudge or kick in the right direction will be appreciated.

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  • A quick tip for those working with the Windows Phone 7 AD SDK.

    - by mbcrump
    One thing that I’ve noticed in several apps in the Windows Phone 7 marketplace is the ad chopping off on the right hand side. I decided that my next Windows Phone 7 app will be ad supported so why not sign up for the Advertising SDK and investigate this issue. *Note: If you want to see this in an actual app then download the free app called “Road Rage”. So here is an example of what I am talking about: You will notice that the right hand side of the AD is chopped off using the default ad banner. You can see the border on the left hand side clearly. So, what exactly is going on? Let’s take a look at this in the designer. From this image we can see it clearer, the margin of the grid that the ad is contained in needs to be removed. By default, the ContentPanel in a Windows Phone Page has a margin already set on it. See below for an example of this: <!--ContentPanel - place additional content here--> <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> </Grid> If you simply remove that margin then your ad will display properly as shown below. It’s strange that I’ve seen this in multiple WP7 applications in the marketplace. If you are trying to make money off Ads, you would probably want to make sure the full ad is displayed. I am hoping this short post helped someone.   Subscribe to my feed

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  • How to test whether an image is already in cache? [migrated]

    - by Evik James
    I am developing a web site that has a lot of large, high-quality images on the home page. On the home page, there is an image carousel that pulls ten high quality images from a database. The images can be 1 meg each. The carousel images aren't my problem (right now), but it has something to do with it. The problem I am trying to address right now is that I use a high quality background image that I want to continue using, it's about 180k. If I have the background in cache on the home page, I want to use it. If not, then I don't want to use it on the home page. I'll load it from a different page. When the user returns to the home page, and the background image is in cache, I want to use it. Can I test whether an image is already in cache and if so, dynamically load or NOT load based on that? You can see the home page here: http://flyingpiston2012-com.securec37.ezhostingserver.com/

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  • Oracle Secure Global Desktop (SGD) 5.1

    - by wcoekaer
    Last week, we released the latest update of Oracle Secure Global Desktop. Release 5.1 introduces a number of bug fixes and smaller changes but the most interesting one is definitely increased support for html5-based client access. In SGD 5.0 we added support for Apple iPads using Safari to connect to SGD and display your session right inside the browser. The traditional model for SGD is that you connect using a webbrowser to the webtop and applications that are displayed locally using a local client (tta). This client gets installed the first time you connect. So in the traditional model (which works very well...) you need a webbrowser, java and the tta client. With the addition of html5 support, there's no longer a need to install a local client, in fact, there is also no longer a need to have java installed. We currently support Chrome as a browser to enable html5 clients. This allows us to enable html5 on the android devices and also on desktops running Chrome (Windows, MacOS X, Linux). Connections will work transparently across proxy servers as well. So now you can run any SGD published app or desktop right from your webbrowser inside a browser window. This is very convenient and cool.

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  • How should I compress a file with multiple bytes that are the same with Huffman coding?

    - by Omega
    On my great quest for compressing/decompressing files with a Java implementation of Huffman coding (http://en.wikipedia.org/wiki/Huffman_coding) for a school assignment, I am now at the point of building a list of prefix codes. Such codes are used when decompressing a file. Basically, the code is made of zeroes and ones, that are used to follow a path in a Huffman tree (left or right) for, ultimately, finding a byte. In this Wikipedia image, to reach the character m the prefix code would be 0111 The idea is that when you compress the file, you will basically convert all the bytes of the file into prefix codes instead (they tend to be smaller than 8 bits, so there's some gain). So every time the character m appears in a file (which in binary is actually 1101101), it will be replaced by 0111 (if we used the tree above). Therefore, 1101101110110111011011101101 becomes 0111011101110111 in the compressed file. I'm okay with that. But what if the following happens: In the file to be compressed there exists only one unique byte, say 1101101. There are 1000 of such byte. Technically, the prefix code of such byte would be... none, because there is no path to follow, right? I mean, there is only one unique byte anyway, so the tree has just one node. Therefore, if the prefix code is none, I would not be able to write the prefix code in the compressed file, because, well, there is nothing to write. Which brings this problem: how would I compress/decompress such file if it is impossible to write a prefix code when compressing? (using Huffman coding, due to the school assignment's rules) This tutorial seems to explain a bit better about prefix codes: http://www.cprogramming.com/tutorial/computersciencetheory/huffman.html but doesn't seem to address this issue either.

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  • How to access Ubuntu Server from local PC?

    - by Roland
    Today I installed my first web server, which is Ubuntu 12.04 LTS. I got Apache, PHP and MySql working, there is even MyPHPAdmin! Everything is working fine on that PC, but the problem is that I have no idea how to connect to this server from my PC. Just to clarify- I got one PC that I work on and got another one, which has Ubuntu Server running. I even managed to connect them through the router, which I made to work as a switch. I can see the Ubuntu Server on my Windows PC in "Network", but it's empty, I can't see any files. I tried to share a folder etc/www on Server, but it shows an error saying something about right, that I'm not this folder's owner. I guess I'm not doing the right thing at all, am I? Even if I could see shared folder on my Windows PC- I would still be not able to type "somedomain.com" on Windows PC and access for example index.php or MySql database. So, the question is- how do I configure Ubuntu Server to be accessible from Windows PC?

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  • Customer Reviews on Company Listings [closed]

    - by GSTAR
    I'm not sure if this is the right place but I am after some general advice on a feature I am looking to implement on my website. The website I have is a Wedding Directory. Here, companies can advertise in the form of a directory listing. This listing contains the company details - such as what they do and how you can contact them. There are three packages available - Basic package is free and Silver and Gold packages are charged for. Now in order to further enhance the directory, I want to enable customer reviews for each listing. This is basically whereby customers who have used a particular company's service can write a review (and rate out of 5) of their experience. The dilemma I face is that if customers are to be paying for their listings then surely they will expect to not have content on their listing that would tarnish their reputation (i.e. negative reviews). But at the same time I want to be impartial and help my site visitors to make informed choices on which companies to book when arranging their weddings. Of course I will exercise my ability to remove offensive or fake reviews but I do not want to be removing reviews just to satisfy my clients. Suppose a client pays me a premium fee to have their listing on my front page and at the top of the listings. Now suppose that client gets lost of negative reviews - the fact that they have increased visibility means that they will also get increased bad publicity. This in turn means they won't renew their package and will most likely request the listing to be taken down. So, how can I get the right balance here and keep everyone happy?

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  • Kubuntu never gets to the login screen

    - by searchfgold6789
    I am not sure if Xorg is using the right device... The system in question is an A4-1400 CPU with built-in Radeon Graphics. I added a PCIe Radeon HD 5750, and changed the BIOS so it would use that card automatically. Now it appears that I can see output from the TV plugged into the HDMI port, and boot into recovery mode, but cannot get to a desktop - X doesn't start. It just freezes at the Kubuntu splash screen. I have no idea how to get X to use the proper graphics card. I pasted the Xorg.log to http://paste.ubuntu.com/6261137/. And the Xorg.conf generated by aticonfig --initial is at http://paste.ubuntu.com/6261161/ Also, see lspci and lshw -c display outputs. I can provide more information, but something does tell me X is not using the right graphics card and I've no idea where to begin how to fix it... I faced a similar issue before with another distribution but found no information anywhere on how to make X use a specific graphics card. Or maybe it's not that simple.

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  • Movement on the X an Z axis are combined?

    - by Magicaxis
    This is probably a stupid question, but I'm trying to simply move a 3D object up, down, left, and right (Not forward or backward). The Y axis works fine, but when I increment the object's X position, the object moves BOTH right and backwards! when I decrement X, left and forwards! setPosition(getPosition().X + 2/*times deltatime*/, getPosition().Y, getPosition().Z); I was astonished that XNA doesnt have its own setPosition function, so I made a parent class for all objects with a setPosition and Draw function. Setposition simply edits a variable "mPosition" and passes it to the common draw function: // Copy any parent transforms. Matrix[] transforms = new Matrix[block.Bones.Count]; block.CopyAbsoluteBoneTransformsTo(transforms); // Draw the model. A model can have multiple meshes, so loop. foreach (ModelMesh mesh in block.Meshes) { // This is where the mesh orientation is set, as well // as our camera and projection. foreach (BasicEffect effect in mesh.Effects) { effect.EnableDefaultLighting(); effect.World = transforms[mesh.ParentBone.Index] * Matrix.CreateRotationY(MathHelper.ToRadians(mOrientation.Y)) * Matrix.CreateTranslation(mPosition); effect.View = game1.getView(); effect.Projection = game1.getProjection(); } // Draw the mesh, using the effects set above. mesh.Draw(); } I tried to work it out by attempting to increment and decrement the Z axis, but nothing happens?! So using the X axis changes the objects x and z axis', but changing the Z does nothing. Great. So how do I seperate the X and Z axis movement?

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  • Sprite batching in OpenGL

    - by Roy T.
    I've got a JAVA based game with an OpenGL rendering front that is drawing a large amount of sprites every frame (during testing it peaked at 700). Now this game is completely unoptimized. There is no spatial partitioning (so a sprite is drawn even if it isn't on screen) and every sprite is drawn separately like this: graphics.glPushMatrix(); { graphics.glTranslated(x, y, 0.0); graphics.glRotated(degrees, 0, 0, 1); graphics.glBegin(GL2.GL_QUADS); graphics.glTexCoord2f (1.0f, 0.0f); graphics.glVertex2d(half_size , half_size); // upper right // same for upper left, lower left, lower right graphics.glEnd(); } graphics.glPopMatrix(); Currently the game is running at +-25FPS and is CPU bound. I would like to improve performance by adding spatial partitioning (which I know how to do) and sprite batching. Not drawing sprites that aren't on screen will help a lot, however since players can zoom out it won't help enough, hence the need for batching. However sprite batching in OpenGL is a bit of mystery to me. I usually work with XNA where a few classes to do this are built in. But in OpenGL I don't know what to do. As for further optimization, the game I'm working on as a few interesting characteristics. A lot of sprites have the same texture and all the sprites are square. Maybe these characteristics will help determine an efficient batching technique?

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  • MVVM and service pattern

    - by alfa-alfa
    I'm building a WPF application using the MVVM pattern. Right now, my viewmodels calls the service layer to retrieve models (how is not relevant to the viewmodel) and convert them to viewmodels. I'm using constructor injection to pass the service required to the viewmodel. It's easily testable and works well for viewmodels with few dependencies, but as soon as I try to create viewModels for complex models, I have a constructor with a LOT of services injected in it (one to retrieve each dependencies and a list of all available values to bind to an itemsSource for example). I'm wondering how to handle multiple services like that and still have a viewmodel that I can unit test easily. I'm thinking of a few solutions: Creating a services singleton (IServices) containing all the available services as interfaces. Example: Services.Current.XXXService.Retrieve(), Services.Current.YYYService.Retrieve(). That way, I don't have a huge constructor with a ton of services parameters in them. Creating a facade for the services used by the viewModel and passing this object in the ctor of my viewmodel. But then, I'll have to create a facade for each of my complexe viewmodels, and it might be a bit much... What do you think is the "right" way to implement this kind of architecture ?

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  • Dell Inspiron7520 and ubntu 12.04 issues

    - by user91358
    I have a DELL Inspiron 7520 in the highest configuration: 3rd Generation Intel® Core™ i7-3612QM processor (6M Cache, up to 3.1 GHz) 15.6" Full High Definition (1080p) LED Display 8GB3 Dual Channel DDR3 SDRAM at 1600MHz 1TB 5400RPM SATA HDD + 32GB mSATA SSD w/Intel Smart Response Blu-ray Disc (BD) Combo (Reads BD and Writes to DVD/CD) AMD Radeon™ HD 7730M 2GB 6.09 lbs and I have installed Ubuntu 12.04 few days ago and I'm facing some issues: 1) sometimes the whole ntb freezes and I have to hold power button for 5 secs to shut it down. I think it is something with VGA and connected external monitor. I have read somewhere that it is already a reported bug, but what I am not sure about that it is doing sporadically. Sometimes it freezes right after I log in, sometime I ran few hours and then it freezes. I am using those proprietary drivers but I wasn't been able to install those with updates. 2) the next issue is the fan is quite noisy even when the ntb is almost Idle. (max 10% CPU usage). Can you recommend me some software which could do this power management to lower the noise? I have tried CPU frequency scaling indicator, but it seems that it has not any effects. 3) and issue no. 3: when I want to log out, restart or shutdown using the menu in upper right corner the upper and left trays disappear, but programs are still running and they won't close to complete log out or shutting down the OS. When I use the CLI command, it works fine. Thanks for any help you can provide.

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  • Test JPQL with NetBeans IDE 7.3 Tools

    - by Geertjan
    Since I pretty much messed up this part of the "Unlocking Java EE 6 Platform" demo, which I did together with PrimeFaces lead Çagatay Çivici during JavaOne 2012, I feel obliged to blog about it to clarify what should have happened! In my own defense, I only learned about this feature 15 minutes before the session started. In 7.3 Beta, it works for Java SE projects, while for Maven-based web projects, you need a post 7.3 Beta build, which is what I set up for my demo right before it started. Then I saw that the feature was there, without actually trying it out, which resulted in that part of the demo being a bit messy. And thanks to whoever it was in the audience who shouted out how to use it correctly! Screenshots below show everything related to this new feature, available from 7.3 onwards, which means you can try out your JPQL queries right within the IDE, without deploying the application (you only need to build it since the queries are run on the compiled classes): SQL view: Result view for the above: Here, you see the result of a more specific query, i.e., check that a record with a specific name value is present in the database: Also note that there is code completion within the editor part of the dialog above. I.e., as you press Ctrl-Space, you'll see context-sensitive suggestions for filling out the query. All this is pretty cool stuff! Saves time because now there's no need to deploy the app to check the database connection.

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  • Recursive function with for loop python

    - by user134743
    I have a question that should not be too hard but it has been bugging me for a long time. I am trying to write a function that searches in a directory that has different folders for all files that have the extension jpg and which size is bigger than 0. It then should print the sum of the size of the files that are in these categories. What I am doing right now is def myFuntion(myPath, fileSize): for myfile in glob.glob(myPath): if os.path.isdir(myFile): myFunction(myFile, fileSize) if (fnmatch.fnmatch(myFile, '*.jpg')): if (os.path.getsize(myFile) > 1): fileSize = fileSize + os.path.getsize(myFile) print "totalSize: " + str(fileSize) THis is not giving me the right result. It sums the sizes of the files of one directory but it does not keep suming the rest. For example if I have these paths C:/trial/trial1/trial11/pic.jpg C:/trial/trial1/trial11/pic1.jpg C:/trial/trial1/trial11/pic2.jpg and C:/trial/trial2/trial11/pic.jpg C:/trial/trial2/trial11/pic1.jpg C:/trial/trial2/trial11/pic2.jpg I will get the sum of the first three and the the size of the last 3 but I won´t get the size of the 6 together, if that makes sense. Thank you so much for your help!

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  • Best practice- handling images on website

    - by Steve
    I am porting an old eCommerce site to MVC 3 and would like to take advantage of design improvements. The site currently has product images stored in 3 sizes: thumbnail, medium (for display in a list) and expanded for a zoomed look. Right now we are having to upload 3 separate images that are sized exactly right, provide 3 different names that match what the site expects, etc., it is a pain. I'd like to upload just 1 file, the large one, then let the site reduce it to needed sizes, and I'd like the flexibility to change the thumbnail and list sizes depending on user preferences, form factor (e.g. mobile, iPad, desktop), etc. so might need many copies of the same image. My question is should the image be reduced then saved several times upon upload and if so what is a good storage/naming convention? The other idea is to store just the single image but resize it programmatically before serving it to the client. Has anybody done this and what are the tradeoffs besides a few more machine cycles? How do you pass a temporary image in memory to the client (there is no URL)?

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  • Coping with build order requirements in automated builds

    - by Derecho
    I have three Scala packages being built as separate sbt projects in separate repos with a dependency graph like this: M---->D ^ ^ | | +--+--+ ^ | S S is a service. M is a set of message classes shared between S and another service. D is a DAL used by S and the other service, and some of its model appears in the shared messages. If I make a breaking change to all three, and push them up to my Git repo, a build of S will be kicked off in Jenkins. The build will only be successful if, when S is pushed, M and D have already been pushed. Otherwise, Jenkins will find it doesn't have the right dependent package versions available. Even pushing them simultaneously wouldn't be enough -- the dependencies would have to be built and published before the dependent job was even started. Making the jobs dependent in Jenkins isn't enough, because that would just cause the previous version to be built, resulting in an artifact that doesn't have the needed version. Is there a way to set things up so that I don't have to remember to push things in the right order? The only way I can see it working is if there was a way that a build could go into a pending state if its dependencies weren't available yet. I feel like there's a simple solution I'm missing. Surely people deal with this a lot?

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  • some questions related to ubuntu app showdown

    - by user49557
    Where to ask questions related to ubuntu app developer showdown? http://askubuntu.com/questions/151148/how-do-i-participate-in-the-ubuntu-app-showdown Can I use old code by myself to build on for my entry in the Ubuntu App Showdown contest? after seeing these threads and posting a question at askubuntu where to ask questions related to ubuntu app showdown i got we can ask these questions here my questions: can i submit more than one app in the contest and tell me more about this suppose i submit 5 apps out of which one is won then will it be valid if 2 or 3 are won i think the number of t-shirts does not depends upon number of apps one per person for development i have to use quickly but can i use third party libraries for GUI or other work i think i will need it for eg. pyside the first and second winner will get laptop + mobile too right or not the mobile how the prizes will be delivered will they charge(i don't think so) i would like to use multiple libraries i can use htme right ? more details are always welcomes i have mostly all ubuntu app showdown related pages but if you find something in background than tell me note:i am not saying that i am going to win just questions don't take it in that way

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  • How to Program AWS Spot Instances to Strategically Bid So the Auction is Never Lost Until a Competitor Beats the Maximum I'm Willing to Pay?

    - by Taal
    I believe I'm in the right section of stack exchange to ask this. If not, let me know. I only use Amazon Web Services for temporary type hosting services, so the spot instances are quite valuable to me. I would also just make an instance and start and stop it - but - that doesn't necessarily fit my bootstrapped budget sadly. Anyways, it really kills me when someone outbids me on a spot instance I have (I tend to go for the larger ones which there are fewer of available) and I get randomly kicked off. I know or at least I believe there is a way to program in something somehow to dynamically change your bidding price to beat a potential competitor's if their's is higher than yours. Now, I previously believed Amazon would just charge me for the highest price right above the next lowest competitor automatically (eliminating the need for this) - so if I bid too high, then I only pay what I would of needed to in order to win and keep the auction. Essentially, I thought my bid price was my max bid price. Apparently, according to my bills and several experiments I've done - this is not the case. They charge me for whatever I bid even when I know there is no one else around to counter bid me. I needed to clarify that, but let me get back to the main point: Let's say I'm bidding $0.50, competitor comes in and bids 0.55 cents. I get kicked off. I want to have it to where I'd set a maximum I'm willing to pay (let's say $1.00 here), and then when competitor comes in and tries to bid $.55, my bid is dynamically adjusted to beat his at $0.56 up until he breaks my $1.00 threshold. I've been reading the guides and although they are more or less straightforward, I feel like they leave a few holes in them that end up confusing me. Like, for instance, where do I input said command or when do I do it? Maybe I'm just tech illiterate and need help deciphering these guides. A good start for someone willing to answer/help me decipher this problem would be here: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-as-update-bid.html

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  • Can I dynamicaly size a div based on discreet units and still center? [closed]

    - by Dave
    Here's the problem: I have a website I'm working on that, depending on what the user has selected, will pop up a different number of boxes 80px high and 200px wide and currently set to float:left. These boxes are contained within a div that is basically the whole width of the screen minus some 1% margins. So at the moment they all fill in the box and, depending on screen size, occupy a grid of variable height and width. The problem is, if the screen size makes the containing box, say, 700px wide then you end up with 3 boxes per row and a bloody big margin on the right. What I would like to do is center the grid of boxes inside the containing box so that the margins are equal left and right. I suspect this can't be done since it means the containing box needs to set its size by looking both at the size of the user's window as well as the size of its children. It would be easy to do with javascript but I'd prefer not to if that is an option. If it is truly impossible then I will simply script it and let non-js users see a left-justified set of boxes.

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  • How to implement string matching based on a pattern

    - by Vincent Rischmann
    I was asked to build a tool that can identify if a string match a pattern. Example: {1:20} stuff t(x) {a,b,c} would match: 1 stuff tx a 20 stuff t c It is a sort of regex but with a different syntax Parentheses indicate an optional value {1:20} is a interval; I will have to check if the token is a number and if it is between 1 and 20 {a,b,c} is just an enumeration; it can be either a or b or c Right now I implemented this with a regex, and the interval stuff was a pain to do. On my own time I tried implementing some kind of matcher by hand, but it turns out it's not that easy to do. By experimenting I ended up with a function that generates a state table from the pattern and a state machine. It worked well until I tried to implement the optional value, and I got stuck and how to generate the state table. After that I searched how I could do this, and that led me to stuff like LL parser, LALR parser, recursive-descent parser, context-free grammars, etc. I never studied any of this so it's hard to know what is relevant here, but I think this is what I need: A grammar A parser which generates states from the grammar and a pattern A state machine to see if a string match the states So my first question is: Is this right ? And second question, what do you recommend I read/study to be able to implement this ?

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