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• Haskell lists difference

  - by user559354

  I'm trying make a lists difference. Found directly prelude operator \\\\ that makes lists difference. But errors Not in scope: '\\\\' occurs. Here is my simple from command line interpreter: Prelude> ([1,2,3] ++ [5,6]) -- works like expected [1,2,3,4,5,6] prelude> ([1,2,3] \\\\ [1,2]) -- erros occurs <interactive>:1:11: Not in scope: "\\\\" Thanks for explanation where I make a mistake.

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• Why is T() = T() allowed in C++?

  - by Rimo

  I believe the expression T() creates an rvalue (by the Standard) However the following code compiles (at least on gcc4.0) class T {... }; int main() { T() = T(); } I know technically this is possible because member functions can be invoked on temporaries and the above is just invoking the operator= on the r-value temporary created from T(). But conceptually this is like assigning a new value to an r-value. Is there a good reason why this is allowed?

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• How to get a random node from a tree?

  - by ooboo

  It looks easy, but I found the implementation tricky. I need that for a simple genetic programming problem I'm trying to implement. The function should, given a node, return the node itself or any of its children such that the probability of choosing a node is normally distributed relative to its depth (so the function should return mostly middle nodes, but sometimes the root itself or the lowest ones - but that's not really necessary if that makes it significantly more complex, if all any node is chosen with equal probability, that's good enough). Thanks

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• sizeof, size_t and dtddef.h

  - by yCalleecharan

  Hi, if I'm using the sizeof operator and making use of size_t in my code, do I have necessarily have to include the preprocessor directive stddef.h ? I haven't included the stddef.h and my code compiles without warning with both MVS2008 and with Borland C++ BuilderX. Thanks a lot...

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• testing if a register equals itself in ia32

  - by hatorade

  (ia32) for example, test $eax, $eax why would you ever want to do that? it does $eax & $eax, right? shouldn't this always set the flag register to say that they are equal..?

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• NULL value in :conditions =>

  - by Horace Ho

  Contract.all(:conditions => ['voided == ?', 0]).size => 364 Contract.all(:conditions => ['voided != ?', 0]).size => 8 Contract.all.size => 441 the 3 numbers does not added up (364 + 8 != 441). What's the proper way write the :conditions to count the rows which the voided column value is NULL or equal to zero?

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• how to retrieve the most entered value from database mssql using vb.net ?

  - by D Infosystems

  if i have mssql database with record displayed below : Id Serv-code Value 1 100 3 2 100 4 3 100 3 4 100 3 5 101 5 6 101 5 the logic i want when i search for the record using serv_code 100 then the output will be the average means 3 will be displayed in textbox because the value 3 will be entered 3 times than 4 as shown above .... and if if i search record with serv_code 100 and if the value of serv_code is equal means 3 and 4 only then the recent entered value will be displayed in textbox..

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• Shift Operators in C++

  - by Codeguru

  If the value after the shift operator is greater than the number of bits in the left-hand operand, the result is undefined. If the left-hand operand is unsigned, the right shift is a logical shift so the upper bits will be filled with zeros. If the left-hand operand is signed, the right shift may or may not be a logical shift (that is, the behavior is undefined). Can somebody explain me what the above lines mean??

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• MATLAB: comparing 2 columns content

  - by Patrick

  hi, I need to compare the content of 2 tables, more exactly 2 columns (1 column per table) in Matlab to see, for each element of the firsts column, there is an equal element in the second column. Should I use a for loop or is there any MATLAB function doing this ? thanks

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• What is MySql equivalent of Sql Server Full Text Search?

  - by Nitesh Panchal

  Hello, I have worked with Sql Server in past and used it's very nice feature called Sql Full Text Search. Now i have to work with MySql. Can anybody tell me what is equivalent of Full Text Search in MySql? I am using free edition of MySql and not a commercial one. If not, then what else can we do to mimic Full Text Search and get over the limitations of LIKE operator? Thanks in advance :)

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• MySQL: SUM in WHERE clause

  - by checcco

  Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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• int ** vs int [ROWS][COLS]

  - by user355638

  I have a 2D array declared like this: int arr[2][2]={ {1,2},{3,4}}; Now if I do: int ** ptr=(int**) arr; and: cout<<**ptr; I am getting a segmentation fault (using g++-4.0). Why so? Shouldn't it be printing the value 1 (equal to arr[0][0])?

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• Hidden features in java [closed]

  - by Ravisha

  Possible Duplicate: Hidden Features of Java Just want to know any hidden/very rarely used features of java which are not so dominant in coding. Like i found the ?? operator in c#

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• From Now() to Current_timestamp in Postgresql

  - by xRobot

  In mysql I am able to do this: SELECT * FROM table WHERE auth_user.lastactivity > NOW() - 100 now in postgresql I am using this query: SELECT * FROM table WHERE auth_user.lastactivity > CURRENT_TIMESTAMP - 100 but I get this error: operator does not exist: timestamp with time zone - integer How can I resolve ?

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• help with sql query - in access 2007

  - by Gold

  hi i have 2 tables table items has 144602 records table A has 27721 records code in items = BAR8 in A i want to show all records that equal i try this: SELECT Items.Code, A.BAR8 FROM Items INNER JOIN A ON Items.Code = A.BAR8; and i get 28048 records !!! i need to get 27721 , how to do it ? thank's in advance

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• Comparison of IPEndPoint objects not working

  - by Martin Mizzell

  I have an IPEndPoint a and b, whose IPAddress and Port are exactly the same, but the == operator is on the IPEndPoint not returning true. To make things even stranger, I tried to circumvent the problem by simply comparing the IPAddress and Port individually and it is STILL not returning true. Has anyone encountered this before? If so, I am all ears to performant solutions. We have collections of as many as 10k IPEndPoints and are querying into them via LINQ (PLINQ pretty soon).

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• Should I always include stddef.h if I use sizeof and size_t

  - by yCalleecharan

  Hi, if I'm using the sizeof operator and making use of size_t in my code, do I have necessarily have to include stddef.h? I haven't included stddef.h, and my code compiles without warning with both MVS2008 and with Borland C++ BuilderX. Thanks a lot...

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• C++ struct sorting

  - by Betamoo

  I have a vector of custom Struct that needs to be sorted on different criteria each time Implementing operator < will allow only one criteria But I want to be able to specify sorting criteria each time I call C++ standard sort. How to do that? Please note it is better to be efficient in running time.. Thanks

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• Comparing the values of two generic Numbers

  - by PartlyCloudy

  I want to compare to variables, both of type T extends Number. Now I want to know which of the two variables is greater than the other or equal. Unfortunately I don't know the exact type yet, I only know that it will be a subtype of java.lang.Number. How can I do that? Thanks!

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• Howto get Autocomplete for the Propertys in Eclipse

  - by mobbek_hobbeb

  Is it possible to get Autocomplete or Something when i work with the eclipse form editor? I write a color in the strings.xml and then i want to select it by the propertys for the text color, but there is no autocomplete or something equal

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• How does Dictionary<T> work with key objects that don't implement Equals and GetHashCode?

  - by DayOne

  If I place a key object in an Dictionary that doesn't implement Equals and GetHashCode how does the Dictionary ContainsKey work? By checking the references are equal? Thanks

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• How do I define my own operators in the Io programming language?

  - by klep

  I'm trying to define my own operator in Io, and I'm having a hard time. I have an object: MyObject := Object clone do( lst := list() !! := method(n, lst at(n)) ) But when I call it, like this: x := MyObject clone do(lst appendSeq(list(1, 2, 3))) x !! 2 But I get an exception that argument 0 to at must not be nil. How can I fix?

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• pls give reason why this java program always comes to the else part

  - by Anbu

  public class Test { public static void main(String[] args){ if (5.0 5) // (5.0<5) for both case it is going to else System.out.println("5.0 is greater than 5"); else System.out.println("else part always comes here"); /another sample/ if (5.0 == 5) System.out.println("equals"); else System.out.println("not equal"); } } can any one explain the first "if statement" why it always come to else part

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• How can i convert from wostream to ostream

  - by Avishay

  i am using a function that receives ostream but i have wostream is there a way to convert one to the other? in particular i want to use boost::write_graphviz which takes ostream but i currently in << operator for wostream.

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• ActionScript Reading Static Const Array

  - by TheDarkIn1978

  how can i evaluate weather my test array is equal to my static constant DEFAULT_ARRAY? shouldn't my output be returning true? public class myClass extends Sprite { private static const DEFAULT_ARRAY:Array = new Array(1, 2, 3); public function myClass() { var test:Array = new Array(1, 2, 3); trace (test == DEFAULT_ARRAY); } //traces false

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