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• HFT strategy coding on hardware

  - by bsobaid

  Hardware accelaration and embedded programming has mostly been used so far to parse datafeed and/or to route orders to exchange. Have there been attempts to write simpler HFT strategies such as equity market-making in hardware? Have they been successful? Which companies are doing this and what kind of programming model is used?

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• Underscore as a segment_separators in routing.yml

  - by Mickael

  In symfony project, I would like to use an underscore as a separator for the parameter in routing.yml. Url example: /article/lorem-1111_45.html In routing.yml rule_sample: url: /article/:info-:datePublished_:id.html param: { module: cms, action: test } options: segment_separators: ['-', '/', '.', '_'] requirements: info: ^([A-Za-z0-9\-]+)$ datePublished: \d+ id: \d+ This code doesnt work. I have the following error: Unable to parse "/article/:info-:datePublished_:id.html" route near ":id.html". Anybody knows how to implement this rule ?

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• RDF-raptor-parser

  - by naveen

  Hi All, I am trying to parse the rdf file but I am getting error while executing following code in ubuntu RDF::Reader.open("http://datagraph.org/jhacker/foaf.rdf") do |reader| reader.each_statement do |statement| puts statement.inspect end end as LoadError: Could not open library 'libraptor': libraptor: cannot open shared object file: No such file or directory. Could not open library 'libraptor.so': libraptor.so: cannot open shared object file: No such file or directory I installed all the required gems: rdf rdf-raptor ffi rdf-json rdf-trix Please help me how to rectify this problem thanks in advance Naveenkumr.R

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• Jquery css: applying !important styles

  - by mkoryak

  I am having trouble applying a style that is !important. Ive tried: $("#elem").css("width", "100px !important"); This does nothing, no width style whatsoever is applied. Is there a jquery-ish way of applying such a style without having to overwrite cssText (which would mean id need to parse it first etc)

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• Objective-C DOM XML parser for iPhone

  - by phunehehe

  Hello guys I'm looking for a way on the iPhone to parse an XML document using DOM. I have been using SAX with NSXMLParser but now I really want a DOM tree (or anything that can quickly translate the XML document into an NSDictionary) Thanks for any help

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• How to make a phone call in android and comes back to my activity when call is done

  - by hap497

  Hi, I am launching an activity to make a phone call, but when I pressed the 'end call' button, it does not go back to my activity. Can you please tell me how can I launch a call activity which comes back to me when 'End call' button is pressed? This is how I'm making the phone call: String url = "tel:3334444"; Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse(url)); Thank you.

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• Encrypting XML database in python

  - by RSK

  i am using XML as my backend for the application... LXML is used to parse the xml. How can i encrypt this xml file to make sure that the data is protected...... thanks in advance.

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• Python modify an xml file

  - by michele

  I have this xml model. link text So I have to add some node (see the text commented) to this file. How I can do it? I have writed this partial code but it doesn't work: xmldoc=minidom.parse(directory) child = xmldoc.createElement("map") for node in xmldoc.getElementsByTagName("Environment"): node.appendChild(child) Thanks in advance.

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• ANTLR, Dynamic variables

  - by JTS

  Hello, I have an ANTLR grammar that can parse and evaluate simple expressions like 1+2*4, etc. What I would like to do is to evaluate expressions like 2+$a-$b/4 where the $ variables are dynamic variables, that come from an external source and are continuously updated. Is there any design pattern on how to do this using ANTLR, best practices, etc? Shall I "substring" the $a with the updated value ($a - 4.34) A nicer way to do this? Thx

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• Some questions about working with Haml

  - by damian

  I am trying to use Haml with Grails but I am having some issues. The plugin for haml has errors to parse empty lines. The plugin generate gsp files, so I think that I can use the online haml html generator. Bug I want something like an editor with syntax highlithing, blocks, etc, and that generate html. Is there something like this? Or only the editor? thanks in advance

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• Sort directory listing using RecursiveDirectoryIterator

  - by Scott Saunders

  I'm using RecursiveDirectoryIterator and RecursiveIteratorIterator to build a file listing tree using code like below. I need to the list to be sorted - either directories then files alphabetically, or just alphabetically. Can anyone tell me how to sort the file list? $dir_iterator = new RecursiveDirectoryIterator($groupDirectory); $iterator = new RecursiveIteratorIterator($dir_iterator, RecursiveIteratorIterator::SELF_FIRST); foreach ($iterator as $file) { // do stuff with $file }

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• The FAT, Linux, and NTFS file systems

  - by Phenom

  I heard that the NTFS file system is basically a b-tree. What about the other file systems? Also, how is FAT32 different from FAT16?

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• Children in Enumeration

  - by marionmaiden

  Hello I have a enumeration for elements in a JTree When I find some specific element in this JTree, I want to check it's children. Do the method children() in a Enumeration check it's grandcildren too? For example, let's supose this JTree, considering the identation as new levels of the tree: Fruits apple grape orange peach pineapple strawberry banana If I get the children of grape, will I have just orange and peach or will I get peach children (pineaple) too?

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• Regular Expression for CSV with numbers

  - by Bernie Perez

  I'm looking for some regular expression to help parse my CSV file. The file has lines of number,number number,number Comment I want to skip number,number number,number Ex: 319,5446 564425,87 Text to skip 27,765564 I read each line into a string and I wanted to use some regular express to make sure the line matches the pattern of (number,number). If not then don't use the line.

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• Using mail servers in java

  - by sword101

  greeting all i want to use a mail server where the users send emails to it and then i parse this emails then do some action please suggest me what mail server to be used and where to start some links,tutorials,guide is very appreciated .

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• Setting wildcard queries as default for QueryParser

  - by user46703

  When my users enter a term like "word" I would like it be treated as a wildcard query "word*" so all terms beginning "word" are found. Is there a way to tell the QueryParser to automatically create wildcard queries or do I have to parse the query myself? This shouldn't be a problem for simple queries but it may become tricky for more complex queries.

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• Search for -1 in Solr

  - by Znarkus

  Hi! I have an optional property of type pfloat, that can either be an encoded numeric value, or -1 if the property is not set. Numerics are encoded to be range searchable (1 is encoded to something like 10000000001), but -1 will always be -1. How can I search a field for -1? property:-1 throws parse error and property:'-1' doesn't return anything. Thanks for help!

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• Parsing an xs:duration datatype into a Python datetime.timedelta object?

  - by Rezzie

  As per the title, I'm trying to parse an XML file containing an xs:duration data type. I'd like to convert that into a Python timedelta object, which I can then use in further calculations. Is there any built-in way of doing this? If not, what is the best way to achieve this?

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• Repeated regular expression

  - by javaguy

  How can I parse a strings like : name1="val1" name2="val2" name3="val3" I cannot use split(\s+) as it can be name = "val 1". I am doing java but any laguage is okay.

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• Path parsing in rails

  - by fl00r

  Hi! I am looking for method for parsing route path like this: ActionController::Routing.new("post_path").parse #=> {:controller => "posts", :action => "index"} It should be opposite to url_for Upd I've found out: http://stackoverflow.com/questions/2222522/what-is-the-opposite-of-url-for-in-rails-a-function-that-takes-a-path-and-genera ActionController::Routing::Routes.recognize_path("/posts") So now I need to convert posts_path into "/posts"

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• Make a Button Appear Focused When Not

  - by Bret

  The Find and Replace dialog in Visual Studio is a perfect example of what im trying to accomplish. Notice how the "Find what" text field has keyboard focus but the "Find Next" button appears bluish as if it has keyboard focus also even though it does not. How can I accomplish this myself? I've tried messing with FocusManager and Focus Scopes without much luck. I suspect i may be barking up the wrong tree? Any advice is appreciated! Thanks

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• How to get the linux folder and file icons and names in java?

  - by André

  I'm creating a tree of folders and files in java. Windows and OSX return the system icons and name with the following code: new JFileChooser().getIcon(File f); new JFileChooser().getName(File f); Is there any possibility to get the icons and name of unix systems?. A system command would be ok too. Thanks.

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• IOS Paypal Phonegap Plugin errors

  - by Paul

  I'm trying to implement the Paypal Plugin for Phonegap (Iphone) - (https://github.com/phonegap/phonegap-plugins/tree/master/iPhone/PayPalPlugin). I've followed all the instructions but I get thefollowing error on build from the SAIOSPaypalPlugin.h file - Lexical or Preprocessor issue - PGPlugin.h not found I'm using latest Cordova version freshly downloaded from Phonegap site just weeks ago, so I'm not sure whats missing?

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• descendeing heap sort

  - by user1

  use heap sort to sort this in descending order and show the steps or explanation please below is the tree 79 33 57 8 25 48 below is the array 79 - 33 - 57 - 8 - 25 - 48

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• Programmatically access currency exchange rates

  - by Adam Pierce

  I'm setting up an online ordering system but I'm in Australia and for international customers I'd like to show prices in US dollars or Euros so they don't have to make the mental effort to convert from Australian dollars. Does anyone know if I can pull up to date exchange rates off the net somewhere in an easy-to-parse format I can access from my PHP script ? UPDATE: I have now written a PHP class which implements this. You can get the code from my website.

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