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• "Arbitrary" context free grammars?

  - by danwroy

  Long time admirer first time inquirer :) I'm working on a program which derives a deterministic finite-state automata from a context-free grammar, and the paper I have been assigned which explains how to do this keeps referring to "arbitrary probabilistic context-free grammars" but never defines the meaning of "arbitrary" in relation to PCFGs. I assume they mean "any old PCFG" but then why not just say "any PCFG"? The term also turns up in several Wikipedia entries. At the top of the CFG page there is a reference to arbitrariness in relation to CFGs on ("clauses can be nested inside clauses arbitrarily deeply"), but doesn't make clear why someone would refer to a PCFG or subset of PCFGs as arbitrary. In case anyone is curious, the paper is Parsing and Hypergraphs by Klein and Manning (2001); I've also been reading two other papers by them related to this one (An Agenda-Based Chart Parser for Arbitrary Probabilistic Context-Free Grammars and Empirical Bounds, Theoretical Models, and the Penn Treebank) which use the term extensively but never explain it either. Thanks for your help!

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• too much recursion

  - by Dänu

  Hey guys, I got an error in javascript and it won't get away. :-) In the little recursive thingy following, I want to replace a value inside a (nested) object. var testobj = { 'user': { 'name': 'Mario', 'password': 'itseme' } }; updateObject('emesti', 'password', testobj) function updateObject(_value, _property, _object) { for(var property in _object) { if(property == _property) { _object[property] = _value; } else if(objectSize(_object) > 0) { updateObject(_value, _property, _object[property]); } } return _object }; function objectSize(_object) { var size = 0, key; for (key in _object) { if (_object.hasOwnProperty(key)) size++; } return size; }; After running this, firefox throws the exception "too much recursion" on the line else if(objectSize(_object) > 0) { .

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• How to install the TRIM RAID update for the Intel storage controller?

  - by Mike Pateras

  I just found this article, that says that Intel now supports TRIM for SSDs when the Intel storage controller is in RAID mode. It links to this download page. I'm pretty excited about that, but I'm a little confused. There seem to be two sets of drivers, an executable and something that's bootable. I ran the executable. Is that just to apply the drivers to my system now, and are the bootable drivers so that if I re-format, I won't have to re-run everything? Do I need to do both? And is there a way to check if it worked? I'm running an i7 in Windows 7 (ASUS P6T Deluxe Motherboard) with RAID 0, if that's significant.

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• ToolStripComboBox.SelectedItem change does not propagate to binding source

  - by Marius

  My binding is set up as this: _selectXAxisUnitViewModelBindingSource = new BindingSource(); _selectXAxisUnitViewModelBindingSource.DataSource = typeof(SelectXAxisUnitViewModel); _selectedUnitComboBoxBindingSource = new BindingSource(); _selectedUnitComboBoxBindingSource.DataSource = _selectXAxisUnitViewModelBindingSource; _selectedUnitComboBoxBindingSource.DataMember = "AvailableUnits"; _selectedUnitComboBox.ComboBox.DataSource = _selectedUnitComboBoxBindingSource; _selectedUnitComboBox.ComboBox.DisplayMember = String.Empty; _selectedUnitComboBox.ComboBox.ValueMember = String.Empty; _selectedUnitComboBox.ComboBox.DataBindings.Add("SelectedItem", _selectXAxisUnitViewModelBindingSource, "SelectedUnit", true, DataSourceUpdateMode.OnPropertyChanged); // this is a bug in the .Net framework: http://connect.microsoft.com/VisualStudio/feedback/details/473777/toolstripcombobox-nested-on-toolstripdropdownbutton-not-getting-bindingcontext _selectedUnitComboBox.ComboBox.BindingContext = this.BindingContext; The property "AvailableUnits" is a collection of strings and the "SelectedUnit" is a string-property. Now the dropdown list is populated as expected, but when I select and item in the list, the change is not propagated to the binding source. Any idea what I am doing wrong?

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• changing timezone with dpkg-reconfigure tzdata and debconf-set-selections

  - by Carlos Campderrós

  I want to set up a script that automatically changes the timezone on a machine (running ubuntu 11.10) and also sets the right values to the debconf database. I've tried the following, but it does not work (at the end, the current timezone remains unchanged, and if I run manually the dpkg-reconfigure tzdata command, the selected values are indeed the old ones): #!/bin/sh -e echo "tzdata tzdata/Areas select Europe" | debconf-set-selections echo "tzdata tzdata/Zones/Europe select Madrid" | debconf-set-selections echo "tzdata tzdata/Zones/America select " | debconf-set-selections dpkg-reconfigure -f noninteractive tzdata So, by now, I'm doing it messing with the files /etc/localtime and /etc/timezone directly, but I'd rather prefer the dpkg-reconfigure and debconf way.

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• Best copy and paste software for windows?

  - by jasondavis

  Sorry if this question exist already, I did some searches but could not find one myself. I am looking for the best programs to copy and paste stuff in windows more easily. So let's say instead of the default copy/paste one item at a time, I could have 5 different paragraphs that could all be pasted somewhere seperately. Hopefully this is not to confusing. Instead of bveing able to paste 1 item I would like to have a list of items that can be pasted or some similar functionality under windows. Please help make me more productive, I frequently need to copy and paste different sets of data. Here is a good exampl, let's say I need to be able to past my email somewhere but on another program or webpage I need to paste my home address.

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• CS3, Illustrator - Where Do X/Y Coordinates Measure from?

  - by nicorellius

  I have a project where there are several PDF files. I'm using Illustrator to make these. It seems the point/line of origin is inconsistent from image to image (file to file). Where is the point of origin, by default, in CS3 Illustrator? It would be nice if, while I was positioning images, I could just say, "OK, x coordinate is 5.5 inches in this document, so it is 5.5 in that one." But it seems this is not the case. Anyone know how Illustrator sets these parameters?

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• Access a content control in C# when using Master Pages

  - by Guillaume Gervais

  Good day everyone, I am building a page in ASP.NET, and using Master Pages in the process. I have a Content Place Holder name "cphBody" in my Master Page, which will contain the body of each Page for which that Master Page is the Master Page. In the ASP.NET Web page, I have a Content tag (referencing "cphBody") which also contains some controls (buttons, Infragistics controls, etc.), and I want to access these controls in the CodeBehind file. However, I can't do that directly (this.myControl ...), since they are nested in the Content tag. I found a workaround with the FindControl method. ContentPlaceHolder contentPlaceHolder = (ContentPlaceHolder) Master.FindControl("cphBody"); ControlType myControl = (ControlType) contentPlaceHolder.FindControl("ControlName"); That works just fine. However, I am suspecting that it's not a very good design. Do you guys know a more elegant way to do so? Thank you! Guillaume Gervais.

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• My VPS Server's TimeZone always resets on reboot - Why?

  - by GenericTypeTea

  I'm using a VPS running Virtuozzo Containers with Parallels. Every time I reboot it sets the server's TimeZone to GMT+01 Amsterdam. If I change that to GMT+00 London and then reboot, it gets set back to Amsterdam again. Is there any way I can prevent this? I'm also have a very strange issue whereby .Net is reporting that the DateTime.Now as the +01 Amsterdam time instead of +00 GMT, even after I've change it to London's TimeZone. Is there somewhere else I need to change the TimeZone apart from in the Timezone tab under the system clock?

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• how do i see if a big JSON object contains a value?

  - by Haroldo

  I'm using PHP to json encode a massive multi-dimensional array of events, so i get something like this: var ents = {"7":{"event_id":"7","nn":"The Whisky Drifters","nn_url":"the-whisky-drifters","venue":"The Grain Barge","date_num":"2010-06-11","date_txt":"Friday 11th June","gig_club":"1","sd":"A New Acoustic String Band...","ven_id":"44","art":0},"15":{"event_id":"15","nn":"Bass Kitchen","nn_url":"bass-kitchen","venue":"Timbuk2","date_num":"2010-06-11","date_txt":"Friday 11th June","gig_club":"2","sd":"Hexadecimal \/ DJ Derek \/ Id","ven_id":"21","art":1}, the first dimension is the id, see var ents = {"7":{ So its possible to get the ids without examining the nested objects... What's the fastest, most efficent way to check if my JSON contains an id?

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• query optimization

  - by Gaurav

  I have a query of the form SELECT uid1,uid2 FROM friend WHERE uid1 IN (SELECT uid2 FROM friend WHERE uid1='.$user_id.') and uid2 IN (SELECT uid2 FROM friend WHERE uid1='.$user_id.') The problem now is that the nested query SELECT uid2 FROM friend WHERE uid1='.$user_id.' returns a very large number of ids(approx. 5000). The table structure of the friend table is uid1(int), uid2(int). This table is used to determine whether two users are linked together as friends. Any workaround? Can I write the query in a different way? Or is there some other way to solve this issue. I'm sure I am not the first person to face such a problem. Any help would be greatly appreciated.

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• What's the best platform to publish documentation to internal users?

  - by serialhobbyist

  My team has a need to publish documentation internally. At the moment, it's spread all over the place and this means we often have to search everywhere to find something. We'd like to publish everything in one place. The main thing that stops us is access control - the wikis in place don't belong to us and we can't do it. What is the best tool for publishing docs, ideally fitting these requirements: web front end - readers access docs using browser single place to put docs access control by individual doc or by sets of docs (folders, branch of 'site', ...) if you don't have access to a doc, you don't see the link to that page/doc/folder. either built-in editor or something my users are familiar with (e.g. Word) built-in version control would be nice Also, can you think of other criteria I should've specified?

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• What is the difference between sar -B verses sar -W

  - by Mark

  I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following: What is the correlation between the two sets of statistics. When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with? Which statistic is more closely related to system performance Thanks

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• math syntax checker written in python

  - by neurino

  All I need is to check, using python, if a string is a valid math expression or not. For simplicity let's say I just need + - * / operators (+ - as unary too) with numbers and nested parenthesis. I add also simple variable names for completeness. So I can test this way: test("-3 * (2 + 1)") #valid test("-3 * ") #NOT valid test("v1 + v2") #valid test("v2 - 2v") #NOT valid ("2v" not a valid variable name) I tried pyparsing but just trying the example: "simple algebraic expression parser, that performs +,-,*,/ and ^ arithmetic operations" I get passed invalid code and also trying to fix it I always get wrong syntaxes being parsed without raising Exceptions just try: >>>test('9', 9) 9 qwerty = 9.0 ['9'] => ['9'] >>>test('9 qwerty', 9) 9 qwerty = 9.0 ['9'] => ['9'] both test pass... o_O Any advice?

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• Error in R for missing object

  - by griffin

  I have several nested functions, some of which as called in lapply clauses. In the process, sometimes I don't set a default for a parameter and instead check if it was supplied using the missing function. I'm getting a strange error right now when I'm not passing a value for a parameter, it has no default, yet missing resolves to FALSE. And when I try to use or check the parameter in any other way (using length, exists, etc.), I get an error: Error in try(length(x)) : argument "data" is missing, with no default Has anyone experienced this failure of the missing function before?

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• CSS border and the :hover dynamic pseudo-class

  - by dbasch

  Hi All, I have built a persistent dropline menu with two levels using only CSS. It is pretty standard. It is a nested set of UL's and the UL's :hover state is what shows and hides the sub menu levels. Something like this: | *Pets* | Colors | Cars | | Cats | Dogs | Birds| Goats | Sheep | | Pets | *Colors* | Cars | | Red | Orange | Green | Blue| Yellow | I then added a 1px border at the bottom of the first level UL element. Like this: | *Pets* | Colors | Cars | -------------------------------------- | Cats | Dogs | Birds| Goats | Sheep | When I hover over a first level item (Pets), and then move the mouse down to the second level (Cats), the entire second level disappears. I finally figured out that the UL's 1px border is not included in the hover area for the UL. Can I add a border to the bottom of a dropline menu level without messing up the menu hovering? Thanks!

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• Is It Possible to Change Default Windows Idle Time for Task Scheduler?

  - by alharaka

  From the official Microsoft docs: Detecting the Idle State The Task Scheduler service will verify that the computer is in an idle state every 15 minutes. The computer is considered idle if all the processors and all the disks were idle for more than 90% of the past 15 minutes and if there is no keyboard or mouse input during this period of time. Besides, any presentation type application that sets the ES_DISPLAY_REQUIRED flag will make Task Scheduler to not consider the system as being idle. In Windows 7, Task Scheduler considers a processor as idle even when low priority threads (thread priority < normal) execute. Is there any way to change the time to less than 15 minutes minutes? Am I assuming this hard-coded and impossible? My Google-fu has eluded me so far and I found nothing, but wanted to check here before giving up.

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• String of KML needs to be converted to java objects

  - by spartikus

  I have a string of kml coming in on a request object. I have used xjc to create the kml java objects. I am looking for an easy way to create the kml nested java objects from this string. I could parse the string and create each object in the tree by hand but wouldn't it be cool if there was a library or something that would create the java objects for me? Something like KmlType type = parseKML(mykmlStringFromTheRequest); Then type would be a Tree of kml objects. Thanks for the help all.

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• Sencha Touch 2: List does not display in Panel

  - by jrboddie

  I am working on an MVC app in Sencha Touch 2 and am having trouble getting a list to display in a nested panel. The structure of the app has a main view which is a tab panel. One of the items in the tab panel is a defined panel, xtype: 'homepanel'. An item in this panel is the list, xtype: 'newslist' that is linked to the appropriate store and model files. The list does not display unless I change its parent 'homepanel' to a type, Ext.navigation.View. What am I missing in the definition of 'homepanel' as a Panel that prevents the display of the list? Ext.define('ACSO.view.Home', { extend: 'Ext.Panel', //<--works if Ext.navigation.View xtype: 'homepanel', requires: [ 'Ext.TitleBar', 'ACSO.view.NewsList' ], config: { title: 'Home', iconCls: 'home', cls: 'home', scrollable: true, styleHtmlContent: true, items: [ { xtype: 'newslist' } ] } });

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• analysis Big Oh notation psuedocode

  - by tesshu

  I'm having trouble getting my head around algorithm analysis. I seem to be okay identifying linear or squared algorithms but am totally lost with nlogn or logn algorithms, these seem to stem mainly from while loops? Heres an example I was looking at: Algorithm Calculate(A,n) Input: Array A of size n t?0 for i?0 to n-1 do if A[i] is an odd number then Q.enqueue(A[i]) else while Q is not empty do t?t+Q.dequeue() while Q is not empty do t?t+Q.dequeue() return t My best guess is the for loop is executed n times, its nested while loop q times making NQ and the final while loop also Q times resulting in O(NQ +Q) which is linear? I am probably totally wrong. Any help would be much appreciated. thanks

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• FireBug - inspect element problem -- showing different interface?

  - by Susan

  When I used to use Firebugs inspect elements feature it displayed the results like this below. Nice, nested tags on the left...css style on the right. Recently, however, when I try to inspect elements it always shows this: I've tried reverting to older versions of FireBug (can't remember if it started after an update?).. I've poked around the settings... Can't find why it's different. The interface it's showing now is completely useless for figuring out what's going on in the html / css.

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• Double associative array or indexed + associative array

  - by clover

  I'm undecided what's the best-practice approach for what I'm trying to do. I'm trying to enter data into an array where the data will look like this: apple color: red price: 2 orange color: orange price: 3 banana color: yellow price: 2 pineapple color: yellow price: 5 When I get input, let's say green apple (notice it's a combo of color + name of fruit), I'm going to check if the name of fruit part exists in the array and display its data (if it exists). What's the right way to compose those arrays? How would I do an indexed array containing an associative array? (or would this be better as 2 nested associative arrays, I'm guessing not)

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• Consecutive 'if' statements

  - by Ben Packard

  How can I check one thing AND THEN another, if the first is true? For example, say I have a shopping basket object, and I only want to do something if the basket has been created AND it isn't empty. I've tried: if (basket && [basket numberOfItems >0])... But the second condition is evaluated even if the first fails, resulting in a crash (presumably because i'm calling numberOfItems on an object that doesn't exist). I can nest them, but this seems a bit ugly, and more to the point is problematic. Say I want to do one thing if the basket exists AND isn't empty, but another if either isn't true. That doesn't really work well in nested if statements.

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• Flex Builder 3 Unclosable Editor Windows

  - by Sam Goldman

  See: http://i.imgur.com/pQNQh.png Somehow I made this happen and I don't know how to undo it. The image linked above shows my Flex Builder session. The largest section of the window is the editor. Initially, there was a blank window on the screen so I tried closing it, but I couldn't. Then I tried dragging it and realized I could drag it into a corner of itself, hence all the nested windows. I have no idea how to close these windows or simply reset the view. I went to the preferences under General Perspectives, but the "reset" button was disabled for every available perspective. Help?

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• Log "date -s" command

  - by LinuxPenseur

  Hi, I know that the date -s <STRING> command sets the time described by the string STRING. What i want is to log the above command whenever it is used to set the time into the file /tmp/log/user.log. In my Linux distribution the logging is done by syslog-ng. I already have some logs going into /tmp/log/user.log. This is the content of /etc/syslog-ng/syslog-ng.conf in my system for logging into /tmp/log/user.log destination d_notice { file("/tmp/log/user.log");}; filter f_filter10 { level(notice) and not facility(mail,authpriv,cron); }; log { source(s_sys); filter(f_filter10); destination(d_notice); }; What should i do so that date -s command is also logged into /tmp/log/user.log

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