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  • Writing temporary data from R

    - by Shane
    I want to write some temporary data to disk in an R package, and I want to be sure that it can run on every OS without assuming the user has admin rights. Is there an existing R function that can provide a path to a temporary directory on all major OS's? Or a way to reference a user's home directory? Otherwise, I was thinking of trying this: Sys.getenv("temp") I presume that I can't expect people to have write access to their R locations, otherwise I could reference a path within the package directory: .find.package("package.name").

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  • What relationship do software Scrum or Lean have to industrial engineering concepts like theory of constraints?

    - by DeveloperDon
    In Scrum, work is delivered to customers through a series of sprints in which project work is time boxed to a fixed number of days or weeks, usually 30 days. In lean software development, the goal is to deliver as soon as possible, permitting early feedback for the next iteration. Both techniques stress the importance of workflow in which software work product does not accumulate in development awaiting release at some future date. Both permit new or refined requirements and feedback from QA and customers to be acted on with as little delay as possible based on priority. A few years ago I heard a lecture where the speaker talked briefly about a family of concepts from industrial engineering called theory of constraints. In the factory, they use an operations model based on three components: drum, buffer, and rope. The drum synchronizes work product as it flows through the system. Buffers that protect the system by holding output from one stage as it waits to be consumed by the next. The rope pulls product from one work station to the next. Historically, are these ideas part of the heritage of Scrum and Lean, or are they on a separate track? It we wanted to think about Scrum and Lean in terms of drum-buffer-rope, what are the parts? Drum = {daily scrum meeting, monthly release)? Buffer = {burn down list, source control system)? Rope = { daily meeting, constant integration server, monthly releases}? Industrial engineers define work flow in terms of different kinds of factories. I-Factories: straight pipeline. One input, one output. A-Factories: many inputs and one output. V-Factories: one input, many output products. T-Plants: many inputs, many outputs. If it applies, what kind of factory is most like Scrum or Lean and why?

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  • Stream a file to the HTTP response in Pylons

    - by Evgeny
    I have a Pylons controller action that needs to return a file to the client. (The file is outside the web root, so I can't just link directly to it.) The simplest way is, of course, this: with open(filepath, 'rb') as f: response.write(f.read()) That works, but it's obviously inefficient for large files. What's the best way to do this? I haven't been able to find any convenient methods in Pylons to stream the contents of the file. Do I really have to write the code to read a chunk at a time myself from scratch?

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  • Displaying Error Page based on the error exception?

    - by Ramesh
    I am using the exception catching procedure which is the module to track the errors and it write the error description in a log file in the server.I want to display the error details in a common Error page which is having a multi-line textbox from the common function in the module.Is it possible to do that.If possible,How can I do that.... Try ;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;; Catch ex as exception CreateLogFile(Ex) End Try The above description is the error catching portion from the code In the module I have written the CreateLogFile function which write the log file. I want to display the Error Page after writing the log file which should contain the error details.... Please Help...?.

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  • Flex 3 / Air: Writing blank new lines to files using FileStream

    - by Edward
    I want to write some text directly to a file using Flex 3 / Air. The text on the file (call it "Database.txt") must have the following format: Line1 Line2 Line3 var FS:FileStream = new FileStream(); var DatabaseFile:File = File.desktopDirectory.resolvePath("Database.txt"); FS.open(DatabaseFile, FileMode.WRITE); FS.writeUTFBytes("Line1" + "\n" + "Line2" + "\n" + "Line3"); FS.close(); But it writes the following text to the file: Line1 Line2 Line3. I'm pretty sure I'm making a very dummy error, but I cannot figure out what it is. Can anyone help me? Thank you for your time :)

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  • writing header in csv python with DictWriter

    - by user248237
    assume I have a csv.DictReader object and I want to write it out as a csv file. How can I do this? I thought of the following: dr = csv.DictReader(open(f), delimiter='\t') # process my dr object # ... # write out object output = csv.DictWriter(open(f2, 'w'), delimiter='\t') for item in dr: output.writerow(item) Is that the best way? More importantly, how can I make it so a header is written out too, in this case the object "dr"s .fieldnames property? thanks.

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  • How would you communicate with aliens as a computer scientist?

    - by Pyrolistical
    Let's say aliens arrive on Earth and instead of just sending mathematicians and linguistic experts governments around the work decide to send an expert of major field. After a quick round of sorting you are paired up with an alien computer scientist. Given you don't understand each others language how would you using computer science to start the ground work of communication? eg. We know binary is universal, but not the way we write it. The symbols are not universal nor is the the direction we write it (MSB vs LSB and left vs right) Assume aliens are "similar" to us physically it won't impede visual communication.

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  • Who pays developers of open-source software?

    - by darko petreski
    We are facing a lot of open source software. But someone needs to write that software. How are they payed? Do you know a good article about the open source politics and economy? Sometimes the big companies themselves release open source because they have some benefits. Then they sell support, advices ... My question is what is the real economy about open software? No professional will work for nothing. This software are couple of classes but thousand or may be millions of classes. If you are really a pro you will write software for money, because you have life, wife, kids, taxes, you must earn. Please do not tell me that they are doing this for pleasure or hobby!

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  • IIS7 Modules - managed or native?

    - by Simon Linder
    Hi all, as the old ISAPI filters are going to die sooner or later, I want to rewrite an old ISAPI filter that was used in IIS 6 into a module for use in IIS 7. The module will be used globally, meaning it will be used within each site, on a Windows Server 2008 R2 with IIS 7.5 installed, that will host several thousand web sites and managing about 50 application pools. My question now is if I should write that module in managed or unmanaged code? One of my concerns regarding managed code is the massive memory consumption due to the .NET framework overhead. I don't know how this would effect the server's performance. I already wrote modules in managed as well as in unmanaged code. So this is not the bothering my decision. But I would prefer to write the module in C# if there are no huge drawbacks. Any suggestions about that issue?

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  • How to pass email from one form to another page's form with javascript

    - by zac
    I am trying to have an email signup form on one page populate the email block on another page by passing it through the url and pulling it out with document.write. The first form is something like: <form action="/sign-up"> <input type="text" name="passEmail"><input type="submit"></form> And the recieving form is like : <form name="theForm"> <input type='text' name='email'></form> And I am trying a script like this <SCRIPT LANGUAGE="javascript"> var locate = window.location document.theForm.email.value = locate var text = document.theForm.email.value function delineate(str) { theEmail = str.indexOf("=") + 1; return(str.substring(theEmail)); } document.write(delineate(text)); </SCRIPT> Instead of pulling the email after the = in the url it is pulling the entire url. Can someone help me accomplish this?

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  • How do you add a row to a databound datagridview using the datagridview in the gui?

    - by IsaacB
    Hi guys, I've bound a datagridview to a collection of objects. It's giving me a null reference exception when I try to add a new row to a collection (empty or otherwise) using the gui. More specifically, when there is a write event it does this. How can I override the behavior of the write event and manually add all of the columns contents to the object collection? I could disable the add new row feature and make an add button, but the built in datagridview row add looks so much more slick.

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  • What can I do about Hack Attempts

    - by Matt
    I have an ASP.net website hosted using the Ultidev Web Server Pro. Every day I get a steady stream of errors generated by my application where page requests were requested and denied. This is obviously someone/something trying to find any exploits on my website. Here is an example log: 28/08/2012 11:37:11 - File not Found:http://MyWebServer/phpmyadmin/index.php 28/08/2012 11:37:11 - File not Found:http://MyWebServer/phpMyAdmin/index.php 28/08/2012 11:37:12 - File not Found:http://MyWebServer/phpMyAdmin-2/index.php 28/08/2012 11:37:12 - File not Found:http://MyWebServer/php-my-admin/index.php 28/08/2012 11:37:13 - File not Found:http://MyWebServer/phpMyAdmin-2.2.3/index.php 28/08/2012 11:37:13 - File not Found:http://MyWebServer/phpMyAdmin-2.2.6/index.php 28/08/2012 11:37:14 - File not Found:http://MyWebServer/phpMyAdmin-2.5.1/index.php 28/08/2012 11:37:14 - File not Found:http://MyWebServer/phpMyAdmin-2.5.4/index.php 28/08/2012 11:37:15 - File not Found:http://MyWebServer/phpMyAdmin-2.5.5-rc1/index.php 28/08/2012 11:37:15 - File not Found:http://MyWebServer/phpMyAdmin-2.5.5-rc2/index.php 28/08/2012 11:37:15 - File not Found:http://MyWebServer/phpMyAdmin-2.5.5/index.php 28/08/2012 11:37:16 - File not Found:http://MyWebServer/phpMyAdmin-2.5.5-pl1/index.php 28/08/2012 11:37:16 - File not Found:http://MyWebServer/phpMyAdmin-2.5.6-rc1/index.php 28/08/2012 11:37:17 - File not Found:http://MyWebServer/phpMyAdmin-2.5.6-rc2/index.php 28/08/2012 11:37:18 - File not Found:http://MyWebServer/phpMyAdmin-2.5.6/index.php 28/08/2012 11:37:18 - File not Found:http://MyWebServer/phpMyAdmin-2.5.7/index.php 28/08/2012 11:37:19 - File not Found:http://MyWebServer/phpMyAdmin-2.5.7-pl1/index.php 28/08/2012 13:52:07 - File not Found:http://MyWebServer/admin/pma/translators.html Is this normal? Is there anything I can do to protect myself against this?

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  • Concatenating rows from different tables into one field

    - by Markus
    Hi! In a project using a MSSQL 2005 Database we are required to log all data manipulating actions in a logging table. One field in that table is supposed to contain the row before it was changed. We have a lot of tables so I was trying to write a stored procedure that would gather up all the fields in one row of a table that was given to it, concatenate them somehow and then write a new log entry with that information. I already tried using FOR XML PATH and it worked, but the client doesn't like the XML notation, they want a csv field. Here's what I had with FOR XML PATH: DECLARE @foo varchar(max); SET @foo = (SELECT * FROM table WHERE id = 5775 FOR XML PATH('')); The values for "table", "id" and the actual id (here: 5775) would later be passed in via the call to the stored procedure. Is there any way to do this without getting XML notation and without knowing in advance which fields are going to be returned by the SELECT statement?

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  • Calculating next date in Turbo Pascal

    - by Chaima Chaimouta
    program date; uses wincrt; var m,ch,ch1,ch2,ch3: string ; mois,j,a,b: integer ; begin write('a');read(a); write('j');read(j); write('mois');read(mois); case mois of 1,3,5,7,8,10: if j<31 then begin b:=j+1; m:=str(b,ch)+'/'+str(mois,ch2)+'/'+str(a,ch3); else if j=31then b:=1; s:=mois+1; m:=concat(str(b,ch),'/',str(s,ch2),'/',str(a,ch3)); end else m:='erreur'; 4,6,9,11:if j<30 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else j=30 then begin b:=1; s:=mois+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else m:='erreur'; 2:if j<28 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else if j=28 then begin b:=1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if((a mod 4=0)AND (a mod 100<>0)) or ((a mod 100=0)and(a mod 400=0)) then if j<29 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if j=29 then begin b:=1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else m:='erreur'; 12:if j<31 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if j=31 then begin b:=1; s:=a+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(s,ch3)); end; writeln(m); end. this is my program i hope you be able to help me

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  • try...else...except syntax error

    - by iform
    I can't understand this... Cannot get this code to run and I've no idea why it is a syntax error. try: newT.read() #existingArtist = newT['Exif.Image.Artist'].value #existingKeywords = newT['Xmp.dc.subject'].value except KeyError: print "KeyError" else: #Program will NOT remove existing values newT.read() if existingArtist != "" : newT['Exif.Image.Artist'] = artistString print existingKeywords keywords = os.path.normpath(relativePath).split(os.sep) print keywords newT['Xmp.dc.subject'] = existingKeywords + keywords newT.write() except: print "Cannot write tags to ",filePath Syntax error occurs on the last "except:". Again...I have no idea why python is throwing a syntax error (spent ~3hrs on this problem).

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  • A web framework where AJAX was not an after thought

    - by Pirate for Profit
    AJAX is a pain in the ass because it essentially means you'll have to write two sets of similarish code: one for browsers with JavaScript enabled and those without. Not only this, but you have to connect JavaScript events to hook into your models and display the results. And if all that weren't bad enough, you need to send an address change with the request, otherwise the user won't be able to "click back" correctly (if confused look at what happens to the address bar when you click links in GMail). We're searching for something that had the foresight and design goals with all these concerns in mind. Performance and security are also obvious major concerns. We love config-based systems as well, where you don't have to write a lot of code you just drop it into an easily read config format. It's like asking for the holy grail right?

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  • Antenna Aligner Part 3: Kaspersky

    - by Chris George
    Quick one today. Since starting this project, I've been encountering times where Nomad fails to build my app. It would then take repeated attempts at building to then see a build go through successfully. Rob, who works on Nomad at Red Gate, investigated this and it showed that certain parts of the message required to trigger the 'cloud build' were not getting through to the Nomad app, causing the HTTP connection to stall until timeout. After much scratching heads, it turns out that the Kaspersky Internet Security system I have installed on my laptop at home, was being very aggressive and was causing the problem. Perhaps it's trying to protect me from myself? Anyway, we came up with an interim solution why the Nomad guys investigate with Kaspersky by setting Visual Studio to be a trusted application with the Kaspersky settings and setting it to not scan network traffic. Hey presto! This worked and I have not had a single build problem since (other than losing internet connection, or that embarrassing moment when you blame everyone else then realise you've accidentally switched off your wireless on the laptop).

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  • What is the point in using a "real" database modeling tool?

    - by cdeszaq
    We currently have a 10 year old nasty, spaghetti-code-style SQL Server database that we are soon looking to pretty much re-write from scratch as part of a re-write to a large web application. (The existing application will serve as the functional requirements for the next incarnation of the app). Some have suggested we use Visio to do all the diagramming and to generate the DDL, but others have suggested we use a dedicated database design tool, rather than a diagramming tool that is able to export DDL. Is there any benefit to using "real" DB design tools, such as ModelRight, over general tools like Visio? If so, what are those specific benefits? Edit: In a nutshell, what can real/dedicated tools do that something like Visio can't, and how much do these capabilities matter (from a best-practices standpoint, for example)

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  • parent process, and a child process..

    - by icelated
    I am trying to write a program that The parent process will take the arguments to main() and send the characters in them one at a time to the child process through a pipe (one call to write for each character). The child process will count the characters sent to it by the parent process and print out the number of characters it received from the parent. The child process should not use the arguments to main() in any way whatsoever. The child should return normally and not have the parent kill the child. Am i counting the arguments right? am i sending the arguments in one at a time, and am i reaping the child? #include <sys/wait.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define size = 100; int main(int argc, char *argv[]) { int i, count =0; int c; int fdest[2]; // for pipe pid_t pid; //process IDs char buffer[BUFSIZ]; if (pipe(fdest) < 0) /* attempt to create pipe */ perror( "pipe" ); if ((pid = fork()) < 0) /* attempt to create child / parent process */ { perror( "fork" ); } /* parent process */ else if (pid > 0) { close(fdest[0]); for (i=1; i < argc; ++i) { for (c=0; c < strlen(argv[i]); ++c) { write(fdest[1], &argv[i][c], 1); } } close(fdest[1]); wait(NULL); exit(0); } else { /* child Process */ close(fdest[1]); while (read(fdest[0], &buffer, 1) > 0) { count++; } printf("\nchild: counted %d characters\n", count); } wait(NULL); exit(0); }

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  • Ruby PTY.spawn is Hanging - How to fill out Email and Password in simple example

    - by viatropos
    After asking this question, it looks like I need to use Ruby's PTY Module, of which there is no documentation. I have written this code to try to push content to Google App Engine because the python command sometimes asks me for my username and password. But when I run this code, it just hangs. cmd = "appcfg.py update cdn" PTY.spawn("#{cmd} 2>&1") do | input, output, pid | begin input.expect("Email:") do output.write("#{credentials[:username]}\n") end input.expect("Password:") do output.write("#{credentials[:password]}\n") end rescue Exception => e puts "GAE Error..." end end What am I missing here? How can I get this to work?

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  • how can we use AsynCallback method of web service in asp.net

    - by sameer
    Hi All, I was going through the proxy class which is generated using wsdl.exe found the asyncmethod like BeginAsynXXX() and EndAsyncXXX(). i understood how to utilize them on Windows application but i was wondering how can we use them in Web Application built using asp.net here is the code for web service client build as windows application.can any tell me how we can do this with web application. using System; using System.Runtime.Remoting.Messaging; using MyFactorize; class TestCallback { public static void Main(){ long factorizableNum = 12345; PrimeFactorizer pf = new PrimeFactorizer(); //Instantiate an AsyncCallback delegate to use as a parameter //in the BeginFactorize method. AsyncCallback cb = new AsyncCallback(TestCallback.FactorizeCallback); // Begin the Async call to Factorize, passing in our // AsyncCalback delegate and a reference // to our instance of PrimeFactorizer. IAsyncResult ar = pf.BeginFactorize(factorizableNum, cb, pf); // Keep track of the time it takes to complete the async call // as the call proceeds. int start = DateTime.Now.Second; int currentSecond = start; while (ar.IsCompleted == false){ if (currentSecond < DateTime.Now.Second) { currentSecond = DateTime.Now.Second; Console.WriteLine("Seconds Elapsed..." + (currentSecond - start).ToString() ); } } // Once the call has completed, you need a method to ensure the // thread executing this Main function // doesn't complete prior to the call-back function completing. Console.Write("Press Enter to quit"); int quitchar = Console.Read(); } // Set up a call-back function that is invoked by the proxy class // when the asynchronous operation completes. public static void FactorizeCallback(IAsyncResult ar) { // You passed in our instance of PrimeFactorizer in the third // parameter to BeginFactorize, which is accessible in the // AsyncState property. PrimeFactorizer pf = (PrimeFactorizer) ar.AsyncState; long[] results; // Get the completed results. results = pf.EndFactorize(ar); //Output the results. Console.Write("12345 factors into: "); int j; for (j = 0; j<results.Length;j++){ if (j == results.Length - 1) Console.WriteLine(results[j]); else Console.Write(results[j] + ", "); } } }

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  • Best way to plan a task ?

    - by Indigo Praveen
    Hi All, As I am very new to programming, I am very curious about learning the best ways/practices of programming. Whenever I want to write any program , I strat directly with coding while some guys say that you should plan your program first before starting the code. But I don't understand the real value of creating the class diagrams and all that kind of stuff coz I think that ultimately I have to write the code. Can you guys please share your experiences about how you are doing your programming means what is your first step when you start an application.

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  • LIKE query for DateTime in NHibernate

    - by Anry
    For a column of type varchar I could write such a query: public IList<Order> GetByName(string orderName) { using (ISession session = NHibernateHelper.OpenSession()) { return session.CreateCriteria<Order>(). Add(Restrictions.Like("Name", string.Format("%{0}%", orderName))). List<Order>(); } } How do I write a similar LIKE-query for a column that has type datetime? public IList<Order> GetByDateTime(DateTime dateTime) { using (ISession session = NHibernateHelper.OpenSession()) { return //LIKE-query } } That is, if the method is passed the date and part-time (eg "25.03.2010 19"), then displays all orders are carried out in this period of time.

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  • iFrame src something other than javascript:false but same effect

    - by macca1
    Is there any other way to write javascript:false that is more pleasant? I'm building a print functionality for an intranet app (for IE6) and I make the printed page using an iframe: $('body').append('<iframe id="printIFrame" src="javascript:false"></iframe>'); $("#printIFrame").attr('style','position:absolute;left:-500px;top:-500px;'); Without having javascript:false in the src, I'll get the "This page contains both secure and nonsecure items" popup when I create it. However the downside of this is that "javascript:false" gets printed as the title on the bottom left of each page (instead of about:blank or something more useful). Is there some kind of javascript technique that I can write javascript:false but in cleaner terms? I tried something like this var PrintOut = false; $('body').append('<iframe id="printIFrame" src="PrintOut"></iframe>'); But I couldn't get that working. Any other ideas?

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