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• How does the #! work?

  - by mocybin

  In a script you must include a #! on the first line followed by the path to the program that will execute the script (e.g.: sh, perl). As far as I know though, the # character denotes the start of a comment and that line is supposed to be ignored by the program executing the script. It would seem though, that this first line is at some point read by something in order for the script to be executed by the proper program. Could somebody please shed more light on the workings of the #! ? Edit: I'm really curious about this, so the more in-depth the answer the better.

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• jQuery accordion expanded

  - by hajder

  I am trying to create an accordion with jQuery from this example http://docs.jquery.com/UI/Accordion The markup is the same, i.e. <div id="accordion"> <h3><a href="#">First header</a></h3> <div>First content</div> <h3><a href="#">Second header</a></h3> <div>Second content</div> </div> And I have script file enqueued correctly, which has the following content: $ = jQuery; $(document).ready(function() { $("#accordion").accordion(); }); But I get this error in the console output TypeError: 'undefined' is not a function (evaluating '$("#accordion").accordion()') The result being all divs are expanded, i.e not clickable.

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• Handling macro redefinition without modifying .h files ... C / C++ language

  - by user310119

  Background: Let assume that I have two header files a.h and b.h. a.h contains: #define VAR 1 b.h contains: #define VAR 2 Note: The name of both of the macro is same. Let say I have some file myFile.c which includes both of the header files i.e. a.h and b.h. When I try to access VAR, I get a redefinition error of VAR. In order to resolve this problem, I inserted #ifndef VAR statement in both a.h and b.h files to prevent this error. a.h file becomes #ifndef VAR #define VAR 1 #endif b.h file becomes #ifndef VAR #define VAR 2 #endif Note: The header file can contain multiple macros, not just one macro. Problem: Let's assume that a.h and b.h files are obtained from third party library. These files don't contain #ifndef VAR statement. I am not allowed to change their header files. Can I resolve macro 'VAR' redefinition error in myFile.c or myFile.cpp file which uses VAR macro? I know I #undef VAR can be used to undefine a macro VAR. How can I selectively include VAR later in my program? i.e. on line 10 of myFile.c code I should be able to refer to VAR definition from a.h file, on line 15 of my code I should be able to refer to VAR from b.h file and on line 18 again I should be able to refer to VAR from a.h file. In short, am I able to do macro polymorphism ? Given a name of header file, it should refer to macro definition present in that file. I thought of using namespace trick to resolve an issue. Define first header file in namespace first and second header file in namespace second. I tried defining two namespaces. First namespace contains #include a.h and second namespace contains b.h. However, namespace trick does not work with macro. When I tried to access firstns::VAR, compiler reports an error message. Can you please suggest some way?

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• Compare two date whit jquery

  - by Mercer

  Hello, i have two String fields who represent Date in my page and i would to compare this two fields to know if my first date < second date <tr> <td align="right">First Date: </td> <td align="left"> <html:text name="addPublicationForm" styleId="firstDate" property="firstDate" maxlength="10"/></td> </tr> <tr> <td align="right">Second Date: </td> <td align="left"> <html:text name="addPublicationForm" styleId="secondDate" property="secondDate" maxlength="10"/></td>

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• Python - How can I make this code asynchronous?

  - by dave

  Here's some code that illustrates my problem: def blocking1(): while True: yield 'first blocking function example' def blocking2(): while True: yield 'second blocking function example' for i in blocking1(): print 'this will be shown' for i in blocking2(): print 'this will not be shown' I have two functions which contain while True loops. These will yield data which I will then log somewhere (most likely, to an sqlite database). I've been playing around with threading and have gotten it working. However, I don't really like it... What I would like to do is make my blocking functions asynchronous. Something like: def blocking1(callback): while True: callback('first blocking function example') def blocking2(callback): while True: callback('second blocking function example') def log(data): print data blocking1(log) blocking2(log) How can I achieve this in Python? I've seen the standard library comes with asyncore and the big name in this game is Twisted but both of these seem to be used for socket IO. How can I async my non-socket related, blocking functions?

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• HandsOnTable - using date functions with methods

  - by briansol

  I have a function used on the datepicker to limit dates selected to the first of the month... I invoke it by setting a class and listener, such as: $( ".datepickfom" ).datepicker( { beforeShowDay: fom, showOn: "both", buttonImage: "/images/calendar.png", buttonImageOnly: true, changeMonth: true, changeYear: true, dateFormat: "m/d/yy", yearRange: "-25:+100", constrainInput: true } ); the fom call: function fom(date){ if (date.getDate() != 1) { return [false, "", "Specify 1st of Month"]; } return [true, ""]; } This works great for regular forms. I'm looking to extend this functionality to the HandsOnTable 'date' cell data types. var $container_1 = $("#datatable_1"); var handsontable_1 = $container_1.data('handsontable'); $("#datatable_1").handsontable( { columns: [ {}, {}, { type: 'date', dateFormat: 'm/d/yy' }, {}, { type: 'dropdown', source: ["","Y","N"] }, {}, {} ] }); This also works as it should, but the date lets me pick other dates besides the first. Is there a way to attach the beforeShowDay option to the HOT cell call as well?

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• Indexing on only part of a field in MongoDB

  - by Rob Hoare

  Is there a way to create an index on only part of a field in MongoDB, for example on the first 10 characters? I couldn't find it documented (or asked about on here). The MySQL equivalent would be CREATE INDEX part_of_name ON customer (name(10));. Reason: I have a collection with a single field that varies in length from a few characters up to over 1000 characters, average 50 characters. As there are a hundred million or so documents it's going to be hard to fit the full index in memory (testing with 8% of the data the index is already 400MB, according to stats). Indexing just the first part of the field would reduce the index size by about 75%. In most cases the search term is quite short, it's not a full-text search. A work-around would be to add a second field of 10 (lowercased) characters for each item, index that, then add logic to filter the results if the search term is over ten characters (and that extra field is probably needed anyway for case-insensitive searches, unless anybody has a better way). Seems like an ugly way to do it though. [added later] I tried adding the second field, containing the first 12 characters from the main field, lowercased. It wasn't a big success. Previously, the average object size was 50 bytes, but I forgot that includes the _id and other overheads, so my main field length (there was only one) averaged nearer to 30 bytes than 50. Then, the second field index contains the _id and other overheads. Net result (for my 8% sample) is the index on the main field is 415MB and on the 12 byte field is 330MB - only a 20% saving in space, not worthwhile. I could duplicate the entire field (to work around the case insensitive search problem) but realistically it looks like I should reconsider whether MongoDB is the right tool for the job (or just buy more memory and use twice as much disk space). [added even later] This is a typical document, with the source field, and the short lowercased field: { "_id" : ObjectId("505d0e89f56588f20f000041"), "q" : "Continental Airlines", "f" : "continental " } Indexes: db.test.ensureIndex({q:1}); db.test.ensureIndex({f:1}); The 'f" index, working on a shorter field, is 80% of the size of the "q" index. I didn't mean to imply I included the _id in the index, just that it needs to use that somewhere to show where the index will point to, so it's an overhead that probably helps explain why a shorter key makes so little difference. Access to the index will be essentially random, no part of it is more likely to be accessed than any other. Total index size for the full file will likely be 5GB, so it's not extreme for that one index. Adding some other fields for other search cases, and their associated indexes, and copies of data for lower case, does start to add up, which I why I started looking into a more concise index.

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• C# Why does calling an interface member from a class generate an error?

  - by Jack

  So I have an interface: interface IFoo { int Bar(); int this[int i] {get; set;} } And a class that derives from it class Foo : IFoo { public int IFoo.Bar() { //Implementation { public int IFoo.this[int i] { //Implementation } } Now, I try to do this: var fooey = new Foo(); int i = Fooey.Bar(); or this: int i = Fooey[4]; I would expect these to work properly. However, the compiler generates an error as if such members don't exist. Why is that? I am aware I can cast Foo as IFoo, but I am also aware that casting is costly to performance, which is often the reason to use interfaces in the first place. EDIT 1: These are the errors generated 'Foo' does not contain a definition for 'Bar' and no extension method 'Bar' accepting a first argument of type 'Foo' could be found (are you missing a using directive or an assembly reference?) "Cannot apply indexing to an expression of type 'Foo'"

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• How to move to another view without using a button

  - by Will

  My first view displays an image and action indicator while web-servers and database function are run in that background. I want the application to go to my tab view when the functions have been completed. How do I do this? Here is what the views look like. What I have tried: TabBarViewController *tab = [[TabBarViewController alloc]init]; [self presentViewController:tab animated:NO completion:nil]; and [self performSegueWithIdentifier:@"first" sender:self]; Please can you help my to understand how to do this. I have spent many hours googling this problem and couldn't work out how to do it. Thanks EDIT: Added Code

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• Turn "log slow queries" ON.

  - by CodedK

  Hello, I'm trying to log mysql slow queries, but I can't turn it on. I will explain all my steps: Open and Edit my.cnf and add the following lines: long_query_time = 5 slow_query_log_file = /myfolder/slowq.log log_slow_queries = 1 =(I have MySQL 5.0.7) Give mysql user permitions to write on the file: chown -R mysql:mysql /var/lib/mysql Create the file: touch /myfolder/slowq.log Chmod for this file to 777. service mysqld restart From MySQL Admin Panel I can see that the "log_slow_queries" var is OFF! Also no logs are created. Thanks in advance! Best Regards, Panos.

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• Linux File Permissions & Access Control Query

  - by Jason

  Hi, Lets say I am user: bob & group: users. There is this file: -rw----r-- 1 root users 4 May 8 22:34 testfile First question, why can't bob read the file as it's readable by others? Is it simply that if you are denied by group, then you are auto-blacklisted for others? I always assumed that the final 3 bits too precedence over user/group permission bits, guess I was wrong... Second question, how is this implemented? I suppose it's linked to the first query, but how does this work in relation to Access Control, is it related to how ACLs work / are queried? Just trying to understand how these 9 permission bits are actually implemented/used in Linux. Thanks alot.

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• How to set up a specific registration on Database

  - by ymorenz

  I'm creating a database so I can access names of people from a university. But I would like to create a registration ID for each person like 1012607, of which the first 2 numbers would be the year (11 for 2011) and the third digit would be the semester they registered (1 in the beginning of the year and 2 in the end of the year). The other 4 digits would be incremental. I don't know how to code a prefixed number in MySQL that can change only the last 4 digits and after a year change the first 2 digits every time you have a new registration. Can someone please help me?

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• No option to import documents into Google Docs [migrated]

  - by Code Droid

  How do I import document into Google Docs? I don't see an import option. Do I open the drive and drop it in? I am trying to follow these ACRA (Application Crash Report for Android) steps: Login to your Google Docs account Import the CrashReports-template.csv contained in the archive (acra-4.2.3/CrashReport/doc), with conversion enabled Open the imported document Rename it as you like In the Google Docs menu, click on Tools / Form / Create a form Where is import option and conversion enabled? I have Google Docs and I'm on a Mac.

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• C Struct as an argument

  - by Brian

  I'm wondering what's the difference between sample1 and sample2. Why sometimes I have to pass the struct as an argument and sometimes I can do it without passing it in the function? and how would it be if samplex function needs several structs to work with? would you pass several structs as an argument? struct x { int a; int b; char *c; }; void sample1(struct x **z;){ printf(" first member is %d \n", z[0]->a); } void sample2(){ struct x **z; printf(" first member is %d \n", z[0]->a); // seg fault } int main(void) { struct x **z; sample1(z); sample2(); return 0; }

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• mktime and date questions..

  - by mjboggess

  Hello SO! I am working on a small project and am playing with date() and mktime() in PHP. Compare the two code blocks and their output, notice the second sample adds one to the month in it's first mktime. $monthis = 5; echo date('F', mktime(0,0,0,$monthis,0,0)) . " 1, 2010 is on a " . date("l F", mktime(0, 0, 0, $monthis, 1, 2010)); puts out April 1, 2010 is on a Saturday May but if I change it to $monthis = 5; echo date('F', mktime(0,0,0,$monthis + 1,0,0)) . " 1, 2010 is on a " . date("l F", mktime(0, 0, 0, $monthis, 1, 2010)); puts out May 1, 2010 is on a Saturday May Why do I have to add one to the month in the first mktime so that both emit the same month? Any help or clarity would be appreciated. Thanks :)

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• Is this possible?

  - by Stud33

  I want to incorporate some Accelerometer code into a Android application im working and want to see if this is possible. Basically what I need is for the code to detect car acceleration motion. I am not wanting to determine speed with the code but just distinguish if the phone is in a car and has accelerated motion (Hence the car is moving for the first time). I have gone through many different accelerometer applications to see if this motion produces a viable profile to go off of and it appears it does. Just looking for something that popups a "Hello World" dialog when it detects your in the car and its moving for the first time down the street. Any help would be appreciated and a simple yes or no its possible would work. I would also be interested in compensating anyone that is capable of doing this as well. I need this done like yesterday so please let me know. Thank You, JTW

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• Jquery and DatePicker - change calendar by the date in the input field

  - by Y.G.J

  i have the value polled from the db and if the user want to change it - i want the calendar to be set first to the date already in the field

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• What are some Coldfusion (mx7 and greater) "Gotchas" that I should know about?

  - by jakeonrails

  I just spent half the day troubleshooting what is apparently a rather famous gotcha for Coldfusion MX7 and below: The nested query loop bug: Where you are required to reference the current_row of the outer query or else you will only see the first record. For example: <cfloop query="outer"> <cfloop query="innner"> <p>#outer.field#</p><!--- this won't work, you'll only get the first row ---> <p>#outer.field[current_row]#</p><!--- you must do this instead ---> </cfloop> </cfloop> Are there any other ways in which ColdFusion does not work in the obvious way?

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• How to extract certain columns from a big Notepad text file?

  - by user560464

  I have a big text file and the data in it are in 5 columns, but I need just the first and the last column of that. It will take many days and probably with mistake if I want to enter the data of this two column one-by-one from here to another file. Is there a fast way to do this? For example: 1 1.0000000000000000 0.0000000000 S {0} 2 1.5000000000000000 0.3010299957 C {2} 3 1.7500000000000000 0.6020599913 S {0,2} 4 2.0000000000000000 0.7781512504 C {3} 5 2.3333333333333333 1.0791812460 C {3,2} 6 2.5000000000000000 1.3802112417 S {3,0,2} 7 2.5277777777777778 1.5563025008 S {0,3} 8 2.5833333333333333 1.6812412374 S {3,0,0,2} 9 2.8000000000000000 1.7781512504 C {5,2} 10 3.0000000000000000 2.0791812460 C {5,0,2} I need the first column (numbering) and the last inside { }.

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• Twitter Answering System with Php

  - by 1342

  I'm working on a project which gives information to students, online and instantly on Twitter ( for my university, I'm also student in Computer Engineering - first year ) I'm fetching mentions which comes to this account - https://twitter.com/BahcesehirBilgi I'm trying to search these in order to filters which i created in my panel. http://imgim.com/2107incia8023554.jpg - This is panel screenshot ( filter add ) I'm splitting filter words and searching them in mydatabase coloumn which get information about users tweet ( using mysql like, %word1%%word2% etc ). http://imgim.com/3792incis3008867.jpg - Example of filter, and answers http://imgim.com/1424incit5317319.jpg - random dashboard screenshot Here is the question, how can i search this filters more accurately and more human friendly in my database ? Please dont forget this is my first project, and new in Php and working alone :)

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• Should I create a new window or modify the old one?

  - by Roman

  I am programming a GUI application in Java. I do it for the first time. I would like to have a form (with radio buttons and so on). After the form is filled in and the "Submit" button is pressed I would like to have a new window. I see two potential ways to do it: Close the "old" window and open a "new" one. Remove "old" elements from the existing window and put there "new" elements. What is the standard way to go? If it is the first way, what is the command to close the window? If it is the second one, how can I remove elements from the existing window?

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• Calculating color shades

  - by matejv

  I have the next problem. I have a base color with couple of different shades of that color. Example: Base color: #4085c5 Shade: #005cb1 Now, I have a different color (let's say #d60620), but no shades of it. From the color I would like to calculate shades, that have similar difference as colors mentioned in first paragraph. First I tried calculating difference of RGB elements and applying them to second color, but the result was not like I expected to be. Than I tried with converting color to HSV, reading saturation value and applying the difference to second color, but again the resulting color was still weird. The formula was something like: (HSV(BaseColor)[S] - HSV(Shade)[S]) + HSV(SecondColor)[H] Does anyone know how this problem could be solved? I know I am doing something wrong, but I don't know what. :)

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• Complex SQL queries (DELETE)?

  - by Joe

  Hello all, I'm working with three tables, and for simplicity's sake let's call them table A, B, and C. Both tables A and B have a column called id, as well as one other column, Aattribute and Battribute, respectively. Column c also has an id column, and two other columns which hold values for A.id and B.id. Now, in my code, I have easy access to values for both Aattribute and Battribute, and want to delete the row at C, so effectively I want to do something like this: DELETE FROM C WHERE aid=(SELECT id FROM A WHERE Aattribute='myvalue') AND bid=(SELECT id FROM B WHERE Battribute='myothervalue') But this obviously doesn't work. Is there any way to make a single complex query, or do I have to run three queries, where I first get the value of A.id using a SELECT with 'myvalue', then the same for B.id, then use those in the final query? [Edit: it's not letting me comment, so in response to the first comment on this: I tried the above query and it did not work, I figured it just wasn't syntactically correct. Using MS Access, for what it's worth. ]

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• Why do dicts of defaultdict(int)'s use so much memory? (and other simple python performance question

  - by dukhat

  import numpy as num from collections import defaultdict topKeys = range(16384) keys = range(8192) table = dict((k,defaultdict(int)) for k in topKeys) dat = num.zeros((16384,8192), dtype="int32") print "looping begins" #how much memory should this use? I think it shouldn't use more that a few #times the memory required to hold (16384*8192) int32's (512 mb), but #it uses 11 GB! for k in topKeys: for j in keys: dat[k,j] = table[k][j] print "done" What is going on here? Furthermore, this similar script takes eons to run compared to the first one, and also uses an absurd quantity of memory. topKeys = range(16384) keys = range(8192) table = [(j,0) for k in topKeys for j in keys] I guess python ints might be 64 bit ints, which would account for some of this, but do these relatively natural and simple constructions really produce such a massive overhead? I guess these scripts show that they do, so my question is: what exactly is causing the high memory usage in the first script and the long runtime and high memory usage of the second script and is there any way to avoid these costs?

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• Searching strings C

  - by Skittles

  First time posting here so I'm sorry if I mess up. I need to search a string and return any strings containing the search data with the search data highlighted. If my string is Hi my name is and I searched name it would produce Hi my NAME is This is a quick code I wrote that works but it only works once. If I try and search again it seg faults. I was hoping someone could hint me at a better way to write this because this code is disgusting! void search(char * srcStr, int n){ int cnt = 0, pnt,i = 0; char tmpText[500]; char tmpName[500]; char *ptr, *ptr2, *ptrLast; int num; while(*(node->text+cnt) != '\0'){ //finds length of string cnt++; } for(pnt = 0; pnt < cnt; pnt++){ //copies node->text into a tmp string tmpText[pnt] = *(node->text+pnt); } tmpText[pnt+1] = '\0'; //prints up to first occurrence of srcStr ptr = strcasestr(tmpText, srcStr); for(num = 0; num < ptr-tmpText; num++){ printf("%c",tmpText[num]); } //prints first occurrence of srcStr in capitals for(num = 0; num < n; num++){ printf("%c",toupper(tmpText[ptr-tmpText+num])); } ptr2 = strcasestr((ptr+n),srcStr); for(num = (ptr-tmpText+n); num < (ptr2-tmpText); num++){ printf("%c",tmpText[num]); } while((ptr = strcasestr((ptr+n), srcStr)) != NULL){ ptr2 = strcasestr((ptr+n),srcStr); for(num = (ptr-tmpText+n); num < (ptr2-tmpText); num++){ printf("%c",tmpText[num]); } for(num = 0; num < n; num++){ printf("%c",toupper(tmpText[ptr-tmpText+num])); } ptrLast = ptr; } //prints remaining string after last occurrence for(num = (ptrLast-tmpText+n); num < cnt; num++){ printf("%c",tmpText[num]); } }

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