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• Mahout Recommendations on Binary data

  - by Pranay Kumar

  Hi, I'm a newbie to mahout.My aim is to produce recommendations on binary user purchased data.So i applied item-item similarity model in computing top N recommendations for movie lens data assuming 1-3 ratings as a 0 and 4-5 ratings as a 1.Then i tried evaluating my recommendations with the ratings in the test-data but hardly there have been two or three matches from my top 20 recommendations to the top rated items in test data and no match for most users. So are my recommendations totally bad by nature or do i need to go for a different measure for evaluating my recommendations ? Please help me ! Thanks in advance. Pranay, 2nd yr ,UG student.

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• Implicit parameter in Scalaz

  - by Thomas Jung

  I try to find out why the call Ø in scalaz.ListW.<^> works def <^>[B: Zero](f: NonEmptyList[A] => B): B = value match { case Nil => Ø case h :: t => f(Scalaz.nel(h, t)) } My minimal theory is: trait X[T]{ def y : T } object X{ implicit object IntX extends X[Int]{ def y = 42 } implicit object StringX extends X[String]{ def y = "y" } } trait Xs{ def ys[T](implicit x : X[T]) = x.y } class A extends Xs{ def z[B](implicit x : X[B]) : B = ys //the call Ø } Which produces: import X._ scala> new A().z[Int] res0: Int = 42 scala> new A().z[String] res1: String = y Is this valid? Can I achieve the same result with fewer steps?

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• Play 2.0 RESTful request post-processing

  - by virtualeyes

  In regard to this question I am curious how one can do post-request REST processing a la (crude): def postProcessor[T](content: T) = { request match { case Accepts.Json() => asJson(content) case Accepts.Xml() => asXml(content) case _ => content } } overriding onRouteRequest in Global config does not appear to provide access to body of the response, so it would seem that Action composition is the way to go to intercept the response and do post-processing task(s). Question: is this a good idea, or is it better to do content-type casting directly within a controller (or other class) method where the type to cast is known? Currently I'm doing this kind of thing everywhere: toJson( i18n("account not found") ) toJson( Map('orderNum-> orderNum) ) while I'd like the toJson/toXml conversion to happen based on accepts header post-request.

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• Use Regular expression with fileinput

  - by chrissygormley

  Hello, I am trying to replace a variable stored in another file using regular expression. The code I have tried is: r = re.compile(r"self\.uid\s*=\s*('\w{12})'") for line in fileinput.input(['file.py'], inplace=True): print line.replace(r.match(line), sys.argv[1]), The format of the variable in the file is: self.uid = '027FC8EBC2D1' I am trying to pass in a parameter in this format and use regular expression to verify that the sys.argv[1] is correct format and to find the variable stored in this file and replace it with the new variable. Can anyone help. Thanks for the help.

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• Bulk get of child entities on Google app engine?

  - by dfrankow

  On Google App Engine in Python, I have a Visit entity that has a parent of Patient. A Patient may have multiple visits. I need to set the most_recent_visit (and some auxiliary visit data) somewhere for later querying, probably in another child entity that Brett Slatkin might call a "relationship index entity." I wish to do so in a bulk style as follows: 1. get 100 Patient keys 2. get all Visits that have any of the Patients from 1 as an ancestor 3. go through the Visits and get the latest for each Patient Is there any way to perform step 2 in a bulk get? I know there is a way to bulk get entities from a list of keys, and there is a way to match a single entity by its ancestor.

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• combining dynamic text with regular expressions in php

  - by pfunc

  I am experimenting with finding popular keywords using curl, php and regular expressions. I have an array of non-specific nouns that I am matching my keyword search up. So I am looking for words like "the", "and", "that" etc. and taking them out of the keyword search. so I have an array of words like so: $wordArr = [the, and, at,....]; and then running something like: && preg_match('(\bmyword\w*\b)', $key) == false how do I combine these two so it loops through the array finding out if any of the words in the array match the regular expression? I guess I could just do a for loop, but though maybe I could use in_array($wordArr, $key).. or something like that.

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• In SQL Server merge replication, how does reinitializing work?

  - by Craig Shearer

  I have set up a pull subscription to a merge publication in SQL Server. I use parameterized row filters on some tables. This works fine with the initial synchronization - just the rows using the filter arrive in the replicated (client) database. However, at some later point I'd like to be able to synchronize the replicated database again from the server and have new rows that match the parameterized row filters appear on the client database. The doucmentation seems to indicate that I can call Reinitialize() to do this. However, when I do try this and Synchronize again, I get an error saying that the script 'snapshot.pre' cannot be applied to the database. I've inspected the script and can see why - it's trying to drop some functions are used by the tables in the database. It would appear that for Reinitialize() to work it requires that the database be blank. Am I misunderstanding something here? Is there a way to make this work?

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• C# regex: negative lookahead fails with the single line option

  - by Sylverdrag

  I am trying to figure out why a regex with negative look ahead fails when the "single line" option is turned on. Example (simplified): <source>Test 1</source> <source>Test 2</source> <target>Result 2</target> <source>Test 3</source> This: <source>(?!.*<source>)(.*?)</source>(?!\s*<target) will fail if the single line option is on, and will work if the single line option is off. For instance, this works (disables the single line option): (?-s:<source>(?!.*<source>)(.*?)</source>(?!\s*<target)) My understanding is that the single line mode simply allows the dot "." to match new lines, and I don't see why it would affect the expression above. Can anyone explain what I am missing here?

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• Date in textboxes changing format

  - by AWinters

  I have an application (asp.net 3.5) that support 4 different languages. Along with other cultural changes, the date formats must match the current culture on out reporting pages. We set the date formats of each of the textboxes like: string date = DateTime.Today.ToString("d"); //returns the date portion only textbox1.Text = date; textbox2.Text = date; etc... When the user selects Spanish or British English the format should be dd/mm/yyyy. However, then I navigate to the page it displays in mm/dd/yyyy. After a postback it then displays dd/mm/yyyy. After another postback it switches to the mm/dd/yyyy format and on and on. I have debugged through this and I see that the culture is correct for the application and the date formats are returned to me correctly, yet when it displays, it displays incorrectly. Has anyone ever seen this or know what is happening?

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• MySQL - Return number of rows matching query data?

  - by Keir Simmons

  I have a query as follows: SELECT 1 FROM shop_inventory a JOIN shop_items b ON b.id=a.iid AND b.szbid=3362169 AND b.cid=a.cid WHERE a.cid=1 GROUP BY a.bought The only thing I need to do with this data is work out the number of rows returned (which I could do with mysqli -> num_rows;. However, I would like to know if there is a method to return the number of rows that match the query, without having to run num_rows? For example, the query should return one row, with one result, number_of_rows. I hope this makes sense!

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• Something similar to this C# code in Ruby on Rails

  - by Jimmy

  Hey guys, I am trying to get a collection of objects based on a conditions. Now normally in C# I would do something like this employeesCollection.Where(emp => emp.Name == "john"); how can I do something similar in Ruby on Rails (I am trying to map a collection of objects to a select but I only want to map certain objects that match a condition. My current ruby on rails code looks like this <%= select( 'page', 'id', @post.pages.map {|page| [page.title, page.id]}) %> I want to add a condition to an attribute of page Can anyone help?

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• Moving Webdav app from Win server 2k to Win server 2k3 now getting authentication issues.

  - by John

  I have an intranet web app that uses CSS httpFolder to map a webdav folder to an IFrame on a web page. The user then can drop files in the frame and the page processes them when the user presses the button. This works well on a Win 2k SP4 server running IIS 5. I have moved the app over to a Win 2k3 server running IIS 6. I have made sure the WebDAV extensions are allowed. I have set everything else in IIS to match the original installation on the old server. But when I try to access the WebDAV folder I am repeatedly prompted for my login credentials. I use my domain admin login but even that doesn't work. What am I missing? What differences are there between WebDAV on 2k vs 2k3? TIA John

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• What tools do you use when generating markup from mockups?

  - by Paul

  So I endeavor to spend most of time on the app server side of things but time to time I need to get my hands dirty and generate markup/css/js from a wireframe or mockup. As far as tools go, Ive found browsershots and Litmus app helpful and of course, vm's as well for checking things out live in ie-{6,7,8}. Otherwise I do the heavy lifting in vim. For generating new markup thats not tied to a target design I think some of the css frameworks & tools like sass look useful but Im skeptical of their utility when needing to generate markup to match a photoshop design. So what tips / tools do you keep in your markup generating utility belt when building solid markup from designs? My list so far: Browsershots Browserlab.adobe.com Haml / Less / Sass (not used but will probably explore)

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• Using a RegEx in a SQL Query

  - by Jim B

  Hey Everyone, Here's the situation I'm in: We have a field in our database that contains a 3 digit number, surrounded by some text. This number is actually a PK in another table, and I need to extract this out so I can implement a proper FK relationship. Here's an example of what would currently reside in the column: Some Text Goes Here - (305) Followed By Some More Text So, what I'm looking to do is extract the '305' from the column, and hopefully end up with a result that looks something like this (pseudo code) SELECT <My Extracted Value>, Original Column Text, Id FROM dbo.MyTable It seems to me that using a Regex match in my query is the most effective way to do this. Can anybody point me in the right direction?

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• Station ID - more than IP

  - by bensiu

  Hello I am working on internal PHP application where users login only from our network (we are on dedicated IP and application is checking $_SERVER['REMOTE_ADDR'] and if is match our IP go thru if not - Bye However how I can identify from which station user is login ? Using cookie not gonna work - those are windows station working under control MS StedyState and all cookies are deleted every login I don't need nothing fancy like full MAC address just any unique ID (can not be application username - because users use different stations) Any ideas ? Maybe Javascript is able to grab some Unique detail from station's browser (IE 8) and pass this as hidden input? bensiu

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• How to determine if birthday or anniversary occured during date range

  - by davekaro

  Given I have a birthday/anniversary DateTime, how can I determine if that date occurred during a specific date range? For example, Birthday = 1/2/2000 Date Range = 12/25/2008 - 1/3/2009 I need a method to determine whether or not this person's birthday happened during that date range - preferably in C#. I first went about changing the year of the birthday DateTime to match the date range, then just check if the "new" birthday DateTime is between the start and end date of the date range... but when the date range spans different years, like in my example above - I had to add a nasty if statement. Is there no better way?

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• How does one avoid "Value restriction" errors with F#'s Seq.cast?

  - by gatoatigrado

  I see that Seq has a cast function from IEnumerable to Seq, but how do I get it to work? open System.Text.RegularExpressions;; let v = Regex.Match("abcd", "(ab)");; Seq.cast (v.Captures);; This produces, error FS0030: Value restriction. The value 'it' has been inferred to have generic type val it : seq<'_a Either define 'it' as a simple data term, make it a function with explicit arguments or, if you do not intend for it to be generic, add a type annotation.

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• Why does this regular expression fail?

  - by Stephen

  I have a password validation script in PHP that checks a few different regular expressions, and throws a unique error message depending on which one fails. Here is an array of the regular expressions and the error messages that are thrown if the match fails: array( 'rule1' => array( '/^.*[\d].*$/i', 'Password must contain at least one number.' ), 'rule2' => array( '/^.*[a-z].*$/i', 'Password must contain at least one lowercase letter' ), 'rule3' => array( '/^.*[A-Z].*$/i', 'Password must contain at least one uppercase letter' ), 'rule4' => array( '/^.*[~!@#$%^&*()_+=].*$/i', 'Password must contain at least one special character [~!@#$%^&*()_+=]' ) ); For some reason, no matter what I pass through the validation, the "Special Characters" rule fails. I'm guessing it's a problem with the expression. If there's a better (or correct) way to write these expressions, I'm all ears!

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• Storing/Quering multiple value in SQLite

  - by chmod

  I'm trying to store a blooming season in month for each tree in SQLite3. Currently I had the field "month" then I store the month name in the field. For example Tree Name Month Tree1 Jan,Feb,Mar Tree2 Nov,Dec,Jan Tree3 Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec Tree4 Mar,Apr,Nov,Dec Tree5 Jan,Feb,Mar,Apr I'm not sure if this is the best way to store it, Any recommendation is appreciate. Secondly, I need to perform a query where I enter in the month and it should return me the tree name that match the search criteria. For example If I search for "Jan" the result should be Tree1,Tree2,Tree3,Tree5 "Jan,Feb,Mar" the result should be Tree1,Tree3,Tree5 "Jan,Feb,Mar,Apr" the result should be Tree5 "Sep,Oct,Nov,Dec" the result should be none Which SQL query do I have to use in order to obtain the above result? Thanks

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• The conceptual process of populating related tables in a database (MySql) from a CSV file

  - by user322772

  I'm new to relational databases and all the material I've read covered primary and foreign keys, normal forms, and joins but left out to populate the database once it's created. How do you import a CSV file so the fields match their related table? Say you were tying to build a beer database and had a CSV file with each line as a record. Header: brewer, beer_name, country, city, state, beer_category, beer_type, alcohol_content Record 1: Anheuser-Busch, Budweiser, United States, St. Louis, Mo, Pale lager, Regular, 5.0% Record 2: Anheuser-Busch, Bud Light, United States, St. Louis, Mo, Pale lager Light, 4.2% Record 3: Miller Brewing Company, Miller Lite, United States, Milwaukee, WI, Pale lager, Light, 4.2% You can create a "Brewer" table and a "Beer" table. When importing how does you connect the primary keys between the tables?

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• accessing and modifying tab opened using window.open in google chrome

  - by sonofdelphi

  I used to be able to this to create an exported HTML page containing some data. But the code is not working with the latest version of Google Chrome (It works alright with Chrome 5.0.307.11 beta and all other major browsers). function createExport(text) { var target = window.open(); target.title = 'Memonaut - Exported View'; target.document.open(); target.document.write(text); target.document.close(); } Chrome now complains that the domains don't match and disallows the Javascript calls as unsafe. How can I access and modify the document of a newly opened browser-tab in such a scenario?

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• How to Override a private set property

  - by David

  Hi, Im using the Microsoft.Office.Interop.MSProject.Resource assembly which has a "UniqueID" property, it has a get but not set. How can I actually set a value? An example would be very much appreciated. --Update-- Ok I can get the value for a property "Name" and set, but Im intersted in the "UniqueId" property that does not have a public set (get only): int ii = (int)resource.GetType().InvokeMember("UniqueID", BindingFlags.GetProperty, null, resource, new object[] { }); resource.GetType().InvokeMember("UniqueID", BindingFlags.SetProperty, null, resource, new object[] {iUid,}); I get the following error {"Number of parameters specified does not match the expected number."} anyway for me to work out how many paramters it needs?

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• Multiplying complex with constant in C++

  - by Atilla Filiz

  The following code fails to compile #include <iostream> #include <cmath> #include <complex> using namespace std; int main(void) { const double b=3; complex <double> i(0, 1), comp; comp = b*i; comp=3*i; return 0; } with error: no match for ‘operator*’ in ‘3 * i’ What is wrong here, why cannot I multiply with immediate constants?

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• Methods for making R plots look like Excel plots?

  - by brianjd

  I've been poking around with R graphical parameters trying to make my plots look a little more professional (e.g., las=1, bty="n" usually help). But not quite there. Started playing with tikzDevice. A huge improvement! Amazing how much better things look when the font sizes and styles in the figure match those of the surrounding document. Still, not quite there. What I'm ultimately looking for are those professional gradient shading, rounded corners, and shadow effects found in MS Excel plots. I know they're probably considered chart junk, but I like them. They're just nice looking. Q: How can I get these effects into my R plots? Do people usually just export to Inkscape and doodle over there? It would be nice if there were a literate programming approach. Is there an R package that handles these effects outright?

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• How to get List of results from list of ID values with LINQ to SQL?

  - by DaveDev

  I have a list of ID values: List<int> MyIDs { get; set; } I'd like to pass this list to an interface to my repository and have it return a List that match the ID values I pass in. List<MyType> myTypes = new List<MyType>(); IMyRepository myRepos = new SqlMyRepository(); myTypes = myRepos.GetMyTypes(this.MyIDs); Currently, GetMyTypes() behaves similarly to this: public MyType GetMyTypes(int id) { return (from myType in db.MyTypes where myType.Id == id select new MyType { MyValue = myType.MyValue }).FirstOrDefault(); } where I iterate through MyIDs and pass each id in and add each result to a list. How do I need to change the LINQ so that I can pass in the full list of MyIDs and get a list of MyTypes out? GetMyTypes() would have a signature similar to public List<MyType> GetMyTypes(List<int> myIds)

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