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• Help with sql query

  - by user225269

  I have two tables: subject and student. I'm trying to count the number of subjects enrolled by each student. How do I do that?I'm trying the code below but it doesn't give the answer I need. Please help. SELECT COUNT( subject.SUBJECT ) , student.IDNO, student.FIRSTNAME, subject.SUBJECT FROM student, subject GROUP BY subject.SUBJECT LIMIT 0 , 30

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• Which is faster: in_array() or a bunch of expressions in PHP?

  - by Darryl Hein

  Is it faster to do the following: if ($var != 'test1' && $var != 'test2' && $var != 'test3' && $var != 'test4') { ... } Or: if (!in_array($var, array('test1', 'test2', 'test3', 'test4') { ... } Is there a number of values at which point it's faster to do one or the other? (In this case, the array used in the second option doesn't alreay exist.)

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• What is effective on time of transfering files between to Memories?

  - by Mehdi

  I think the number of files is so effective in time of transfering files for example : Transfering 1000 item that have 1GB size need more time than transfering 1 file with same size.

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• C# Dictionary Performance

  - by derek

  I am using a Dictionary to store data, and will be caching it. I would like to avoid server memory issues, and have good performance by limiting the size of the Dictionary<, either in size or number of entries. What is the best method of doing this? Is there another class I should be considering other than a Dictionary?

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• Count # of links programmatically

  - by Duber

  You know how if you type links: "yourwebsite.com" into the normal google search box, it tells you the number of sites linking to you and their addresses. How can I do it programmatically with php? Does google provide an api that can I can programmatically query? What are my options?

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• How do I create spaces between every four integers in Ruby?

  - by Trip

  I am trying to take the following number: 423523420987 And convert it to this: 4235 2342 0987 It doesn't necessarily have to be an integer either. In fact, I would prefer it to be a string.

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• Heuristic for sliding tile problem.

  - by MustDash

  The idea is to move all of the right elements into the left and the left into the right with an empty space in the middle. The elements can either jump over one or two pieces into an empty space. LLL[ ]RRR I'm trying to think of a heuristic for this task. Is the heuristic meant to aid in finding a possible solution, or actually return a number of moves as the solution? How would I express such a heuristic?

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• Reduce Triangle in DirectX 9

  - by Himadri

  Hello everyone, I have a 3D object with about 2000 or 3000 triangles. I want to reduce the number of triangle without affecting shape of object. for eg, I have two triangles, (1,1.5,2) (1.5,1.5,2) (1.7,2,2) (1.5,1.5,2) (1.7,2,2) (2,1.5,2) In this case these two triangle is same as a single triangle - (1,1.5,2) (2,1.5,2) (1.7,2,2) I dont want the manual method, But if there is any direct function or such thing which will reduce my triangle list. Thank You.

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• Does PHP have a data type bigger than int?

  - by Jack

  I want to save a 11 digit number inside a variable. How can I do this in PHP?

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• Computing e^(-j) in C..

  - by Erkan H

  I need to compute imaginary exponential in C. As far as I know, there is no complex number library in C. It is possible to get e^x with exp(x) of math.h, but how can I compute the value of e^(-j), where j = sqrt(-1)?

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• Haskell Input & Passing Values to Functions

  - by Pradeep

  putStrLn "Enter the Artist Name" art <- getLine putStrLn "Enter the Number of CD's" num <- getLine let test= buyItem currentStockBase art num printListIO (showcurrentList test) the values i have to pass for buyItem is buyItem currentStockBase "Akon" 20 but i want to send "Akon" to art and for 20 i want to send num it gives me this error ERROR file:.\Project2.hs:126 - Type error in application *** Expression : buyItem currentStockBase art num *** Term : num *** Type : [Char] *** Does not match : Int please help me

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• question about combinatorical

  - by davit-datuashvili

  here is task How many ways are there to choose from the set {1, 2, . . . , 100} three distinct numbers so that their sum is even? first of all sum of three numbers is even if only if 1.all number is even 2.two of them is odd and one is even i know that (n) = n!/(k!*(n-k)! (k) and can anybody help me to solve this problem

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• Scala: recursive search avoiding cycles

  - by user1826663

  How can I write a recursive search that I avoid cycles. My class is this: class Component(var name: String, var number: Int, var subComponent: Set[Component]) Now I need a way to check whether a component is contained within its subcomponent or between subcomponent of its subcomponent and so on.Avoiding possible cycles caused by other Component. My method of recursive search must have the following signature, where subC is the Set [component] of comp. def content (comp: Component, subC: Set[Component]) : Boolean = { } Thanks for the help.

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• Python: convert 2 ints to 32 float

  - by bugspy.net

  How can I combine 2 ints to a single 32bit IEEE floating point ? (each of the 2 ints represent 16 bit) And in the opposite direction: How can I transform a python float into 2 16 bit ints? (I need this because of modbus protocol - where 2x16 bit registers are treated as single 32 floating point number)

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• Find float in a text file

  - by Werner

  Hi, I am trying to find some float number (like -1234.5678) in a huge text file using grep, so I thought about: grep -n '-1234.5678' but I get errors, do you know what is the right way using grep and why? there is anything easier? Thanks

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• Find fields with certain characters

  - by Kemo

  I'm trying to SELECT fields with multiple dots ( . ) in their value. Exactly, I'm trying to find fields with a subdomain as an entry in domain column, e.g.; SELECT * FROM domains WHERE ( number of dots in domain value bigger than 1 ). Any suggestions ?

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• Install python 2.6 in CentOS

  - by tehryan

  I have a shell that runs CentOS For a project I'm doing I need python 2.5+ but centOS is pretty dependent on 2.4 From what I've read a number of things will break if you upgrade to 2.5 I wan't to install 2.5 separately from 2.4 but I'm not sure how to do it. So far I've downloaded the source tarball, untarred it and did a ./configure --prefix=/opt which is where I want it to end up. can I now just make, make install ? or is there more?

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• sifr not working on internet explorer

  - by Nicolaas

  Hi Please have a look here: www.blokeswhobake.co.nz - sifr works great, except it does not want to work with internet explorer. I have had the same problems on a number of sites. I have no idea what I am doing wrong. Thanks for your help

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• How can I add a tab in jquery-ui Tabs and then select it?

  - by Bob

  I understand how to add a jquery-ui tab, and I understand how to select a tab by index number, but how can I both add a tab and then select it? For example, in the following demo you can add a tab, but then you have to click on it for it to be displayed: http://jqueryui.com/demos/tabs/#manipulation I'm on jquery 1.4.2 and jquery-ui 1.8rc3.

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• New help with SQL Server select statement

  - by gio_333m

  I need help with select statement in SQL Server / T-SQL My table looks like this: Id (int) QuestionId (int) GenreId (int) I want to select random N rows from this table so that maximum number of same GenreId in the result set is less than X for all GenreId-s except one. For that one GenreId, I need row count with that GenreId to be equal to Y.

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• Fast way to compute the minimal distance of two sets of k-dimensional vectors

  - by vrld

  I two sets of k-dimensional vectors, where k is around 500 and the number of vectors is usually smaller. I want to compute the (arbitrarily defined) minimal distance between the two sets. A naive approach would be this: (loop for a in set1 for b in set2 minimizing (distance a b)) However, this requires O(n² * distance) computations. Is there a faster way of doing this?

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• Dictionary Application

  - by Joy

  Hi all,I want to develop an iphone application that needs an english word dictionary. Can you people suggest me any link from where i can have that database containing a reasonable number of english words with their meanings and example sentence. Thanks in advance

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• Doubling binary digits

  - by psihodelia

  How to double a number of binary digits in an integer? For example, if bin(x)="1001" then bin(y) must be "11000011". Is there any smart and fast algorithm ?

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• Can I assign an array just by making it equal to another array?

  - by Roman

  I have an array $x with nonzero number of elements. I want to create another array ($y) which is equal to $x. Then I want to make some manipulations with $y without causing any changes to $x. Can I create $y in this way: $y = $x; In other words, if I modify $y created in the above shown way, will I change value of $x?

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• How much data can be sent via $_GET

  - by BenTheDesigner

  How much data can be sent via $_GET in PHP5? Is there a maximum number of variables, string length etc? Thanks in advance.

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