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  • linear interpolation on 8bit microcontroller

    - by JB
    I need to do a linear interpolation over time between two values on an 8 bit PIC microcontroller (Specifically 16F627A but that shouldn't matter) using PIC assembly language. Although I'm looking for an algorithm here as much as actual code. I need to take an 8 bit starting value, an 8 bit ending value and a position between the two (Currently represented as an 8 bit number 0-255 where 0 means the output should be the starting value and 255 means it should be the final value but that can change if there is a better way to represent this) and calculate the interpolated value. Now PIC doesn't have a divide instruction so I could code up a general purpose divide routine and effectivly calculate (B-A)/(x/255)+A at each step but I feel there is probably a much better way to do this on a microcontroller than the way I'd do it on a PC in c++ Has anyone got any suggestions for implementing this efficiently on this hardware?

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  • Database design in blogging systems

    - by Peter
    As a learning exercise I'm trying to put myself a blogging system. The goal is to code something that will let me create multiple blogs, like blogger.com or wordpress.com, but much simplified. I would like to ask you, what do you think is best database design for this type of script. Is it better to have one big table, containing posts from all blogs of all users (like friendfeed) or would it be better to create separate table for each blog's posts? Big thanks in advance for your help, Peter.

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  • What is the fastest way to create a checksum for large files in C#

    - by crono
    Hi, I have to sync large files across some machines. The files can be up to 6GB in size. The sync will be done manually every few weeks. I cant take the filename into consideration because they can change anytime. My plan is to create checksums on the destination PC and on the source PC and than copy all files with a checksum, which are not already in the destination, to the destination. My first attempt was something like this: using System.IO; using System.Security.Cryptography; private static string GetChecksum(string file) { using (FileStream stream = File.OpenRead(file)) { SHA256Managed sha = new SHA256Managed(); byte[] checksum = sha.ComputeHash(stream); return BitConverter.ToString(checksum).Replace("-", String.Empty); } } The Problem was the runtime: - with SHA256 with a 1,6 GB File - 20 minutes - with MD5 with a 1,6 GB File - 6.15 minutes Is there a better - faster - way to get the checksum (maybe with a better hash function)?

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  • Managing data charts

    - by Tom Gullen
    My dbml file is just getting bigger and bigger and more unwieldy: I favoured an all-in-one approach as supposed to multiple data contexts because when I tried that it was near impossible to manage in code. I was advised it was better to have them all in one chart and the difficulty will be simply in managing this chart and not in code. The chart I've got is becoming a pain to manage, if I want to even remove a table and re-add it it sometimes takes a little while to manually find it! There isn't even a list I can find in VS2010 of the objects you have in that chart! Is there a better way of doing this?

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  • reinventing the wheels: Node.JS/Event-driven programming v.s. Functional Programming?

    - by ivanTheTerrible
    Now there's all the hype lately about Node.JS, an event driven framework using Javascript callbacks. To my limited understanding, its primary advantage seems to be that you don't have to wait step by step sequentially (for example, you can fetch the SQL results, while calling other functions too). So my question is: how is this different, or better than just functional languages, like CL, Haskell, Clojure etc? If not better, then why don't people just do functional languages then (instead of reinventing the wheel with Javascript)? Please note that I have none experience in either Node.JS nor functional programming. So some basic explanation can be helpful.

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  • Face recognition Library

    - by Janusz
    I'm looking for a free face recognition library for a university project. I'm not looking for face detection. I'm looking for actual recognition. That means finding images that contain specified faces or libraries that calculate distances between specific faces. I'm using OpenCV for detecting the faces and a rough Eigenfaces Algorithm for the recognition now. But I thought there should be something out there with a better performance then a self written Eigenfaces Algorithm. I don't talk about speed as performance I'm looking for a library with better results as an simple Eigenfaces approach I took a look at faint but it seems the library is not very reusable for my own applications. I'm happy with a library in Python, Java, C++, C or something like that. The best thing would be if it can be run on a Windowsmachine

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  • Best practices for fixed-width processing in .NET

    - by jmgant
    I'm working a .NET web service that will be processing a text file with a relatively long, multilevel record format. Each record in the file represents a different entity; the record contains multiple sub-types. (The same record format is currently being processed by a COBOL job, if that gives you a better picture of what we're looking at). I've created a class structure (a DATA DIVISION if you will) to hold the input data. My question is, what best practices have you found for processing large, complex fixed-width files in .NET? My general approach will be to read the entire line into a string and then parse the data from the string into the classes I've created. But I'm not sure whether I'll get better results working with the characters in the string as an array, or with the string itself. I guess that's the specific question, string vs. char[], but I would appreciate any other pointers anyone has. Thanks.

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  • Java Webstart Truststore SSL

    - by Padur
    Hello Experts .. Need some guidance. I have java webstart app and I want it to connect to a server via SSL.just adding a property like:System.setProperty("javax.net.ssl.trustStore","my.keystore");But since a JAWS program is downloaded from server didn't work and don't have a my.keystore on local file system. So decided to distribute the certificate to all clients.I did the following and it worked, but I am sure there are more better solutions that this.I packed it inside a jar and copied to some temp directory on clients machine and read the truststore jks file. Any ideas to make it better? -Padur ========================================

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  • How to automate disbursement of electronic payments from one bank account to 20,000 other bank accou

    - by Dylan West
    I am helping a startup business to launch and I will be building or finding a shopping cart software for its website. There will only be one product for sale, but anytime someone buys a product, I have to use customer information like their zipcode and which distributor they bought from to calculate commissions that will go to the different distributors. All the incoming money will be sent to one sort of escrow account for a few weeks, and after that few weeks is over, I need to be able to "throw the switch" and cause each of the 20,000 distributors to get their rightful share of that escrow account, depending on the data stored that reflects their sales activity and commissions due. Is this something I can write a script to handle? Better yet, is this something an inexpensive or open source solution can handle, or something that can be setup in something like Paypal? Or is a better approach to somehow create a webpage where each distributor can login to and see their commissions due and initiate the account transfer on their own, but the web app restrict them from transferring more than what they're due? Thanks

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  • database datatype size

    - by yeeen
    Just to clarify by specifying sth like VARCHAR(45) means it can take up to max 45 characters? I rmb I heard from someone a few years ago that the number in the parathesis doesn't refer to the no of characters, then the person tried to explain to me sth quite complicated which i don't understand n forgot alr. And what is the difference btn CHAR and VARCHAR? I did search ard a bit and see that CHAR gives u the max of the size of the column and it is better to use it if ur data has a fix size and use VARCHAR if ur data size varies. But if it gives u the max of the size of the column of all the data of this col, isn't it better to use it when ur data size varies? Esp if u don't know how big is ur data size gg to be. VARCHAR needs to specify the size (CHAR don't really need right?), isn't it more troublesome?

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  • Database Schema for survey polling application with a default choice.

    - by user156814
    I have a survey application, where users can create surveys and give choices for every survey. Other users can choose their answers for the aurvey and then polls are taken to get the results of the survey. I already have the database schema for this Questions id, user_id, category_id, question_text, date_started Answers id, user_id, question_id, choice_id, explanation, date_added Choices id, question_id, choice_text As for now, users can choose their own choice answers to their surveys... but I want to be able to add a default "I dont care" or "I dont know" choice to every survey for people who simply dont care about the topic to take sides or who cant choose. So lets say theres a survey that asks who was a better president, George W. Bush, Bill Clinton, Ronald Reagon, or Richard Nixon... I want to be able to add a default "I dont care" option. I was thinking to just add that extra choice EVERY TIME a user creates a survey, but then I wouldn't have much control over the text for that choice after that survey has been created, and I want to know if theres a better way to do this, like create another table or something Thanks

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  • Cross domain cookie reading/setting cross browsers

    - by Rac123
    I know there are already a few threads available here on this subject but I want others' opinion on this. There are two ways to set/read the cross domain cookies: Creating IFrame on A.com pointing to a page on B.com which creates the cookie and pass that information by creating another IFrame on B.com side pointing to A.com, either using window.name or in location.href.hash A.com page makes a XHR/JSONP call to B.com web service/page that has the following headers and it also sets up the cookie and returns the value. AddHeader("p3p", "CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"") As we don't have postMessage available across all the browsers, I believe we have to go with one of the cases mentioned above. My question is which is a better way (cleaner) and why to implement for cross browser. Using any other JS framework is out of scope of this discussion. If there's another better way, please mention here! Thank you for your intelligent input in advance! :)

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  • Objective C, Core Data issue

    - by Jaime Rae
    I'm following a tutorial in "More iPhone 3 Development. In the code, they have a line: NSManagedObjectContext *managedObjectContext = appDelegate.managedObjectContext; I get an error: "accessing unknown 'managedObjectContext' getter method" on that line. I've downloaded his sample code and his program runs fine with that line of code. I've tried rewriting the code and I've even copied and pasted his code into my program, but I still get the error. I am using the newest SDK, and I'm wondering if something might have changed so this getter method doesn't work anymore, but I do not get any warning about deprecation. Does anyone know what is going on, or better yet, a better way to write this line and not get the error. Thanks LadyDev

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  • Good Guide For Web App Security?

    - by QAH
    Hello! I am pretty good on making web applications and I know how to transfer data to and from client/server, etc. I need some help though learning how to make the data exchanges more secure. That is the reason why I feel kind of scared to publish any web app I make. I wanted to know what are some good guides to help you understand and learn how to secure data transfer with your web application? Things like better authentication for example and making better logins. You can post any suggestion, but just for your information, I mainly code my web apps with Javascript and PHP. Also, I transfer my data using JSON or XML. Thanks a lot

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  • White (Light) vs. Black (Dark) Backgrounds: Health Effects

    - by Hosam Aly
    I am adding a bounty to this question, hoping for some scientific research results. Thank you everybody! I have recently tried working on dark backgrounds, and it seemed (to me) to be easier on the eye. However, today I read Gerrie Schenck's comment on this answer, in which he said that mainframe developers were advised to use white backgrounds instead of black, as it is said that white is easier on the eye. So which one is actually better for the eyes in the long run? I would be thankful for any (scientific) references about the subject, as my eyes really need some relaxation. I wanted to make this question a community wiki, but I think that the least I can do to thank people is to reward their answers, so I'm leaving it as a normal question. Many, many thanks for your help. P.S. I don't know which tags would be appropriate for this question, so I'd be grateful if you could tag it in a better way than I did.

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  • How to detect when window is closed when using Show() in WinForms C#

    - by MadBoy
    I've been using ShowDialog() in following way for all my new Windows. SomeGui test = new SomeGui(); test.ShowDialog(); refreshSomeListView(); However recently I've started to use Show() instead of ShowDialog() and it's working much better. The only drawback of this is that refreshSomeListView(); cannot be used like in example above since if i leave it there it's executed instantly when new Window shows up. What's the best way to know that the user has closed test window and that now refreshSomeListView(); should be executed? What's suggested approach for this? Should it involve setting events in test GUI on Close/Closing or there's other / better method?

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  • Most clever way to parse a Facebook OAuth 2 access token string

    - by RyOnLife
    It's a bit late, but I'm disappointed in myself for not coming up with something more elegant. Anyone have a better way to do this... When you pass an OAuth code to Facebook, it response with a query string containing access_token and expires values. access_token=121843224510409|2.V_ei_d_rbJt5iS9Jfjk8_A__.3600.1273741200-569255561|TxQrqFKhiXm40VXVE1OBUtZc3Ks.&expires=4554 Although if you request permission for offline access, there's no expires and the string looks like this: access_token=121843224510409|2.V_ei_d_rbJt5iS9Jfjk8_A__.3600.1273741200-569255561|TxQrqFKhiXm40VXVE1OBUtZc3Ks. I attempted to write a regex that would suffice for either condition. No dice. So I ended up with some really ugly Ruby: s = s.split("=") @oauth = {} if s.length == 3 @oauth[:access_token] = s[1][0, s[1].length - 8] @oauth[:expires] = s[2] else @oauth[:access_token] = s[1] end I know there must be a better way!

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  • How do I know if have RSI or carpal tunnel?

    - by saniul
    I feel that this is a much better place to ask this than a medical forum, we have ~250 people who spent most of their day in front of a computer. Does anyone here have any experience with such injuries? How/when did you find out? What did you do (if anything)? I don't know if I have the RSI, but I can tell you that I can "crack" my wrist and almost any one of my fingers whenever I want. Also, my wrist sometimes hurts me when I type for a very long time (especially on a laptop keyboard I have very long fingers so the palm is in an uncomfortable position most of the time) Is this normal? I bought a Logitech Wave keyboard, obviously it feels much better than the laptop keyboard, but I can't really tell if it helps the "cracking" and my wrist still sometimes hurts.

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  • Web Services: more frequent "small" calls, or less frequent "big" calls

    - by Klay
    In general, is it better to have a web application make lots of calls to a web service getting smaller chunks of data back, or to have the web app make fewer calls and get larger chunks of data? In particular, I'm building a Silverlight app that needs to get large amounts of data back from the server in response to a query created by a user. Each query could return anywhere from a few hundred records to a few thousand. Each record has around thirty fields of mostly decimal-type data. I've run into the situation before where the payload size of the response exceeded the maximum allowed by the service. I'm wondering whether it's better (more efficient for the server/client/web service) to cut this payload vertically--getting all values for a single field with each call--or horizontally--getting batches of complete records with each call. Or does it matter?

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  • Sending multipart response for downloads in Zend Framework

    - by takeshin
    I'm sending files in action helper for downloads (in parts if needed) like this: ... $response->sendHeaders(); $chunksize = 1 * (1024 * 1024); $bytesSent = 0; if ($httpRange) { fseek($file, $range); } while(!feof($file) && (!connection_aborted() && ($bytesSent < $newLength)) ) { $buffer = fread($file, $chunksize); // $response->appendBody($buffer); // this would be better print($buffer); flush(); $bytesSent += strlen($buffer); } fclose($file); I suspect that better way would be to make use of $response object instead of print. Which is the recommended way to send big response objects using Zend Framework?

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  • I'm a professional Java developer, should I learn .NET?

    - by Alex Spurling
    Java and .NET seem to have a great number of parallels especially in the web application area. Both languages have many of the same technologies especially in terms of open source libraries (JUnit and NUnit, Hibernate and NHibernate) but there are also plenty of differences and different approaches to solving certain software development problems. As a Java developer I get the feeling I'm missing out on learning about web application development from the .NET point of view and I could learn a lot about the general principles by learning two languages rather than getting stuck in the details of Java and not seeing the bigger picture. So the first question is, do you agree? Does learning two separate but similar languages such as Java and .NET make you a better programmer? Secondly, I'm worried that if I choose to take, for example, a MCPD ASP.NET 3.5 certification it won't actually help me get work doing .NET development because it goes against all my existing experience. Is trying to broaden your skills a good career choice or is it a better decision to choose one technology and stick with that?

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