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  • Haskell graph data type representation

    - by John Retallack
    I want to represent a graph in Haskell in the following manner: For each node I want to store it's value and a list of adjacent nodes,the problem which i'm having difficulties with is that I want the adjacent nodes to be stored as references to other nodes. For example: I want node ny to be stored as („NY“ (l p)) where l and p are adjacent nodes,and not as („NY“ („London“ „Paris“)). I tried something like this : data Node a = Node { value :: a , neighbors :: [Node a] }deriving (Show) let n1 = Node {value=1, neighbors=[n2]} let n2 = Node {value=1, neighbors=[n1 n3]} let n3 = Node {value=1, neighbors=[n2]} But i get en error in let,What am I doing wrong ?

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  • rails: self-referential association

    - by john
    hi, My needs are very simple: I have a Tip table to receive comments and have comments to receive comments, too. To retrieve each comment that is stored in the same table (comments), I created another key for the comments on comments: "inverse_comments". I tried to use one comments table by using self-referntial association. Some resources seem to bring more than one table into the piture which are diffent from my needs. So I came up whth the following modeling for comments: class Comment < ActiveRecord::Base belongs_to :tip belongs_to :user has_many :mycomments, :through => :inverse_comments, :source => :comment end Apparently something is missing here but I cannot figure it out. Could some one enlighten me on this: what changes I need to do to make the model work? thanks.

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  • Odd PHP Error Message

    - by John
    When I run some php code I've written, I get the following message: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'condition, price, name, email) VALUES('Fake Title', 'Fake Subhead', 'Fake Author' at line 1 I do not see anything wrong with my syntax, however, which is like: mysql_query("INSERT INTO table (x1, x2, x3) VALUES('$y1', '$y2', '$y3')"); Any ideas?

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  • Thread 0 crashed with X86 Thread State (32-bit): in cocoa Application

    - by John
    I am doing crash fixing in an osx application .The crash report shows Date/Time: 2012-05-01 16:05:58.004 +0200 OS Version: Mac OS X 10.5.8 (9L31a) Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000545f5f00 Crashed Thread: 8 Thread 8 crashed with X86 Thread State (32-bit): eax: 0x140e0850 ebx: 0x00060fc8 ecx: 0x92df0ec0 edx: 0xc0000003 edi: 0x545f5f00 esi: 0x140e0870 ebp: 0xb0445988 esp: 0xb0445964 ss: 0x0000001f efl: 0x00010206 eip: 0x92dca68c cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037 cr2: 0x545f5f00 How to tares the application code with this report? what is Thread 0 crashed with X86 Thread State (32-bit)? if anybody know please help me. Thanks in advance.

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  • Why is [date] + [time] non-deterministic in SQL Server 2008?

    - by John Gietzen
    I'm trying to do the following for my IIS logs table: ALTER TABLE [W3CLog] ADD [LogTime] AS [date] + ([time] - '1900-01-01') PERSISTED However, SQL Server 2008 tells me: Computed column 'LogTime' in table 'W3CLog' cannot be persisted because the column is non-deterministic. The table has this definition: CREATE TABLE [dbo].[W3CLog]( [Id] [bigint] IDENTITY(1,1) NOT NULL, ... [date] [datetime] NULL, [time] [datetime] NULL, ... ) Why is that non-deterministic? I really need to index that field. The table currently has 1598170 rows, and it is a pain to query if we can't do an index seek on the full time. Since this is being UNION'd with some other log formats, we can't very easily just use the two columns separately.

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  • Using JQuery to Style form elements

    - by John
    Hi, I've seen jquery used to change a form select drop down box in to a 'pretty' drop down list widget. I can't remember where I saw this but does anyone have any links or example code which show examples of how to use jquery to style form elements? I'd prefer it if it was code rather than a built in plug in. Thanks

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  • Is this a safe way to reference objects in JavaScript?

    - by John
    If I were to define two objects myDataStore and myDrawer something like this: var myDataStore = function(myObjectRef) { this.myInternalObject = myObjectRef; }; var myDrawer = function(myObjRef) { this.myInternalObject = myObjectRef; }; And if I were to create an object like so: (function(){ var myObject = window.myObject = function(){ this.dataStore = new myDataStore(this); this.drawer = new myDrawer(this); } })(); Then myObject.dataStore.myInternalObject, and myObject.drawer.myInternalObject, would simply be pointers back to the original 'myObject' - not taking up any additional memory in the browser. Yes? I am interested in implementing techniques like this - as it makes it easy for objects to communicate with each other.

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  • Ajax Code to run PHP query After Facebook Like Button is Clicked

    - by John
    I have the PHP below on a file called fblike.php. On another file, I have the Facebook Like button. The Like button functions. I would like to run the code below when the Facebook Like button is clicked. I know that FB.Event.subscribe('edge.create', function(response) {} is supposed to run whenever the Like button is clicked. I know that I am probably supposed to use Javascript and maybe Ajax to cause the PHP on fblike.php to run. But after multiple tries, I can't get it to work. What is the specific Ajax code that I could include within the Facebook Event? Do I need to do anything to the Like button code to allow the Facebook Event to work? $submissionid = $_POST['submissionid']; $uid = $_POST['uid']; mysql_connect("server", "username", "password") or die(mysql_error()); mysql_select_db("database") or die(mysql_error()); $q = "INSERT INTO fblikes VALUES (NULL, '$submissionid', '$uid', NULL)"; $r = mysql_query($q); if($r) { echo "Success!"; } elseif(!$r) { echo "Failed!"; }

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  • Difference between [object variable] and object.variable in Obj-C?

    - by John Smith
    I was working on a program today and hit this strange bug. I had a UIButton with an action assigned. The action was something like: -(void) someaction:(id) e { if ([e tag]==SOMETAG) { //dostuff } } What confuses me is that when I first wrote it, the if line was if (e.tag==SOMETAG) XCode refused to compile it, saying error: request for member 'tag' in 'e', which is of non-class type 'objc_object*' but I thought the two were equivalent. So under what circumstances are they not the same?

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  • R: How to replace elements of a data.frame?

    - by John
    I'm trying to replace elements of a data.frame containing "#N/A" with "NULL", and I'm running into problems: foo <- data.frame("day"= c(1, 3, 5, 7), "od" = c(0.1, "#N/A", 0.4, 0.8)) indices_of_NAs <- which(foo == "#N/A") replace(foo, indices_of_NAs, "NULL") Error in [<-.data.frame(*tmp*, list, value = "NULL") : new columns would leave holes after existing columns I think that the problem is that my index is treating the data.frame as a vector, but that the replace function is treating it differently somehow, but I'm not sure what the issue is?

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  • JIRA: Generating per-user time report?

    - by John
    Sorry if SO is not the best place, but I have time-tracking enabled in JIRA and want to be able to generate a time-report for each user over a given date range. The only time-tracking report option I have is very limited and doesn't do what I want, is it possible through standard functionality or a free plugin perhaps?

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  • Log4j Logging to the Wrong Directory

    - by John
    I have a relatively complex log4j.xml configuration file with many appenders. Some machines the application runs on need a separate log directory, which is actually a mapped network drive. To get around this, we embed a system property as part of the filename in order to specify the directory. Here is an example: The "${user.dir}" part is set as a system property on each system, and is normally set to the root directory of the application. On some systems, this location is not the root of the application. The problem is that there is always one appender where this is not set, and the file appears not to write to the mapped drive. The rest of the appenders do write to the correct location per the system property. As a unit test, I set up our QA lab to hard-code the values for the appender above, and it worked: however, a different appender will then append to the wrong file. The mis-logged file is always the same for a given configuration: it is not a random file each time. My best educated guess is that there is a HashMap somewhere containing these appenders, and for some reason, the first one retrieved from the map does not have the property set. Our application does have custom system properties loading: the main() method loads a properties file and calls into System.setProperties(). My first instinct was to check the static initialization order, and to ensure the controller class with the main method does not call into log4j (directly or indirectly) before setting the properties just in case this was interfering with log4j's own initialization. Even removing all vestiges of log4j from the initialization logic, this error condition still occurs.

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  • simplify in declaring variables value in php

    - by Robert John Concepcion
    $jan5 = 0; $feb5 = 0; $mar5 = 0; $apr5 = 0; $may5 = 0; $jun5 = 0; $jul5 = 0; $aug5 = 0; $sep5 = 0; $oct5 = 0; $nov5 = 0; $dec5 = 0; $jan4 = 0; $feb4 = 0; $mar4 = 0; $apr4 = 0; $may4 = 0; $jun4 = 0; $jul4 = 0; $aug4 = 0; $sep4 = 0; $oct4 = 0; $nov4 = 0; $dec4 = 0; $jan3 = 0; $feb3 = 0; $mar3 = 0; $apr3 = 0; $may3 = 0; $jun3 = 0; $jul3 = 0; $aug3 = 0; $sep3 = 0; $oct3 = 0; $nov3 = 0; $dec3 = 0; this is the most time consuming code when i try to make for example i want the default value of $jan5 is equal to zero.. can some one teach me how to make this short? thank you so much for reading $date = 'smi_initialdate'; $level = 'smi_level'; $year = '2012'; $result1 = mysql_query("SELECT *, DATE_FORMAT( $date, '%m' ) As monthz FROM eis_mngt_sales_iti WHERE year($date) = '$year' ORDER BY $date"); while($row=mysql_fetch_array($result1)) { $count++; if($row['smi_level']=='5star') { if($row['monthz']==1) { $jan++; }elseif($row['monthz']==2) { $feb++; }elseif($row['monthz']==3) { $mar++; }elseif($row['monthz']==4) { $apr++; }elseif($row['monthz']==5) { $may++; }elseif($row['monthz']==6) { $jun++; }elseif($row['monthz']==7) { $jul++; }elseif($row['monthz']==8) { $aug++; }elseif($row['monthz']==9) { $sep++; }elseif($row['monthz']==10) { $oct++; }elseif($row['monthz']==11) { $nov++; }elseif($row['monthz']==12) { $dec++; } } } i decide to put this $jan5 = 0;$feb5 = 0;$mar5 = 0;$apr5 = 0;$may5 = 0;$jun5 = 0;$jul5 = 0; so that if the data did not pass to this condition if($row['smi_level']=='5star') they have the return value of zero(0). so that my output can adapt in this code [<?php echo$jan5.",".$feb5.",".$mar5.",".$apr5.",".$may5.",".$jun5.",".$jul5.",".$aug5.",".$sep5.",".$oct5.",".$nov5.",".$dec5; ?] if a dont use the above code the $jan5 = 0;$feb5 = 0;$mar5 = 0;$apr5 = 0;$may5 = 0;$jun5 = 0;$jul5 = 0;................ when i echo or print it i look like this 1,2,5,11,12 but with the use of that(the first sample code above) the output will be 1,0,0,0,0,0,0,1,2,5,11,12. thank, sorry if this became confusing, sorry about my grammar

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  • is "else if" faster than "switch() case" ?

    - by John
    Hello, I'm an ex Pascal guy,currently learning C#. My question is the following: Is the code below faster than making a switch? int a = 5; if (a == 1) { .... } else if(a == 2) { .... } else if(a == 3) { .... } else if(a == 4) { .... } else .... And the switch: int a = 5; switch(a) { case 1: ... break; case 2: ... break; case 3: ... break; case 4: ... break; default: ... break; } Which one is faster? I'm asking ,because my program has a similiar structure(many,many "else if" statements). Should I turn them into switches?

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