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• How many numbers in an array are smaller than a given number?

  - by Raihan

  The naive one is O(n). Is there a one that is O(log n) or even O(1)? How about a sorted array? How about using binary search tree?

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• Adding additional sorting attributes to array of records...then sorting!

  - by keruilin

  Let's say I run an ActiveRecord query and it returns 3 results, with a bunch of attributes. I want to add 3 attributes to each record in the Array so I can do sorting at a code-level. These 3 include: num_comments, num_views, last_view. How do I add these attributes? How do I then sort the records, in order of precendence, by num_comments AND by num_views AND by last_view?

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• how to represent an integer array using java.util.BitSet ?

  - by nd81

  I need to represent an array of integers using BitSet. Can somebody explain me the logic required to do this ?

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• How can I write an extension method that converts a System.Drawing.Bitmap to a byte array?

  - by Patrick Szalapski

  How can I write an extension method that converts a System.Drawing.Bitmap to a byte array? Why not: <Extension()> _ Public Function ToByteArray(ByVal image As System.Drawing.Bitmap) As Byte() Using ms = New MemoryStream() image.Save(ms, image.RawFormat) Return ms.ToArray() End Using End Function Yet when I use that, I get "System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+." What am I doing wrong?

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• PHP 5 functioning returning an array- interaction without assignment?

  - by Lee

  I'm wondering if this kind of thing will ever be possible in PHP (and whether it already is and I'm just missing something...) <?php function test() { return array( 'id'=>10, 'name'=>'John' ); } echo 'Your name is: '.test()['name']; ?> I'd really like to be able to use returned arrays directly instead of first assigning them to a var... possible?

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• Java - StackOverflow Error on recursive 2D boolean array method that shouldn't happen.

  - by David W.

  Hey everyone, I'm working on a runnable java applet that has a fill feature much like the fill method in drawing programs such as Microsoft Paint. This is how my filling method works: 1.) The applet gets the color that the user clicked on using .getRGB 2.) The applet creates a 2D boolean array of all the pixels in the window, with the value "true" if that pixel is the same color as the color clicked on or "false" if not. The point of this step is to keep the .getRGB method out of the recursive method to hopefully prevent this error. 3.) The applet recursively searches the 2D array of booleans where the user clicked, recording each adjacent point that is "true" in an ArrayList. The method then changes each point it records to false and continues. 4.) The applet paints every point stored in the ArrayList to a user selected color. All of the above steps work PERFECTLY if the user clicks within a small area, where only a few thousand pixels or so have their color changed. If the user selects a large area however (such as about 360,000 / the size of the applet window), the applet gets to the recursive stage and then outputs this error: Exception in thread "AWT-EventQueue-1" java.lang.StackOverflowError at java.util.ArrayList.add(ArrayList.java:351) at paint.recursiveSearch(paint.java:185) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) (continues for a few pages) Here is my recursive code: public void recursiveSearch(boolean [][] list, Point p){ if(isValid(p)){ if(list[(int)p.y][(int)p.x]){ fillPoints.add(p); list[(int)p.y][(int)p.x] = false; recursiveSearch(list, new Point(p.x-1,p.y));//Checks to the left recursiveSearch(list, new Point(p.x,p.y-1));//Checks above recursiveSearch(list, new Point(p.x+1,p.y));//Checks to the right recursiveSearch(list, new Point(p.x,p.y+1));//Checks below } } } Is there any way I can work around an error like this? I know that the loop will never go on forever, it just could take a lot of time. Thanks in advance.

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• C: How to convert a string of ints into actual ints and store them in an array?

  - by Srinivasa Varadan

  I have a string "14 22 33 48". I need to insert each of the values in the string into the respective location in the array: int matrix[5]; so that matrix[0] = 14; matrix[1] = 22; matrix[2] = 33; matrix[3] = 48; How do I do this?

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• How to get first and last occurence of an array of words in text using PHP?

  - by Runner

  $arr = array('superman','gossipgirl',...); $text = 'arbitary stuff here...'; What I want to do is find the first/last occurencing index of each word in $arr within $text,how to do it efficiently in PHP?

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• Getting indices of most recent set of numbers in an array in Matlab?

  - by user2539781

  Let's say I have an array in Matlab: x = [1 1 1 2 2 2 3 3 3 3 2 2 3 3 3 1 1 1 1 1 2 2 2 2 3 3 3] I want the indices of the most recent set of consecutive '1's. In this case, I want the answer: answer = [16 17 18 19 20] % (which should correspond to the last sequence of 1's) I need an automated way to do this in Matlab, that will work with any size arrays, always giving me the indices for the last set of consecutive 1s. Any suggestions?

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• How do I represent integer array as attribute of a class in Visual Studio 2010's UML class diagrams?

  - by AndrejaKo

  How do I represent integer array as attribute of a class in Visual Studio 2010's UML class diagrams? I know hot to add normal integers, but I'm hoping that there is a way to do it other than adding [] to integer's name. I'm new to UML, so I could be missing something obvious here. Should I use Is ordered and Is unique?

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• How to skip the 1st key in an array loop?

  - by aeran

  I have the following code: if ($_POST['submit'] == "Next") { foreach($_POST['info'] as $key => $value) { echo $value; } } How do I get the foreach function to start from the 2nd key in the array? Thanx.

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• Ruby: Efficiently check if a hash's keys include all elements of an Array.

  - by Jason

  I want to compare the keys in a hash of parameters against an array of elements for a match. For example: params = {"key1", "key2", "key3"} params_to_match = ["key2","key3"] I could do this, but I'm sure there is a much more elegant way to acheive the same result params.each_key{|key| if params_to_match.include?(key.to_s) return end }

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• how to add the element in the array using the for loop in objective-c?

  - by uttam

  is this the right way to do the same? nsmutablearray *myarray1 //have some data in it for (int i=0;i< [myarray1 count]; i++) { myArray2 = [NSMutableArray array]; [myArray2 addObject:i]; } and how can i print this value of myarray2.

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• how do i cast a .net single to equivalent byte array that can be stored on the heap?

  - by PeanutPower

  how do i cast a .net single to equivalent byte array that can be stored on the heap? this is to be used as a glfloat

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• how to make array of class objects using dynamic allocation in c#?

  - by jack22

  hi, i made a class named x; so i want to make array of it using dynamic allocation x [] myobjects = new x(); but it gives me that error Cannot implicitly convert type 'ObjAssig4.x' to 'ObjAssig4.x[]' i know it's dump question but i am a beginner thanks

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• How to get exactly typeof is object/array/null..?

  - by 3gwebtrain

  var obj = {},ar = [],nothing=null,empty=undefined,word ='string',headorTail = true; console.log(typeof obj) //object console.log(typeof ar)//object console.log(typeof nothing)//object console.log(typeof empty)//undefined console.log(typeof word)//string console.log(typeof headorTail)//boolean But how can i get the type of obj,ar,nothing as "object, array,null" - what is the best way to achieve this?

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• Need a sample function implement for array interface member...

  - by Nano HE

  I have a interface member like this. AppInterface.cs ObjLocation[] ArrayLocations { get; } App.cs public ObjLocation[] ArrayLocations { get { return **something**; } } I dont know how to complete it, Or there is another way to implement the array members. Then It can pass the compiler. thank you.

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• easiest way to take file into an array? - c#

  - by Alexry

  I have a file of integers. the first number - the number of subsequent numbers. as the easiest way to take this file into an array? C#

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• Given an array of integers where some numbers repeat 1 time, some numbers repeat 2 times and only on

  - by SS

  Given an array of integers where some numbers repeat 1 time, some numbers repeat 2 times and only one number repeats 3 times, how do you find the number that repeat 3 times. Using hash was not allowed. Complexity of algorithm should be O(n)

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• read PPM file and store it in an array; coded with C

  - by mary

  Hello, I need to read a PPM file and store it in an array written in C. Can anybody help me out doing this? Thanks a lot.

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• How to initialize 4th position only in Array of 5 positions.

  - by mahesh

  Hi, I wanted to store 10 in 4th position of array of 5 positions. How to do ? int main( ) { int a[5] = {,,,,4} ; return 0; } If i do that i get error. Please help. Thanks in advance.

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• How do I search a Perl array for a matching string?

  - by Mike

  What is the smartest way of searching through an array of strings for a matching string in Perl? One caveat, I would like the search to be case-insensitive so "aAa" would be in ("aaa","bbb")

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• How to find the maximized contiguous SUM in an array (which contains +ve and -ve numbers)?

  - by siva

  ContigSum(i,j) as the sum of the contiguous elements a[i] through a[j], i<=j and a[] contains +ve & -ve numbers Could you please tell me a time efficient solution to find maximized contiguous SUM in the array?

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• Is it possible to use extract() with an array key name 'some.key'?

  - by chadley

  If I am going to use the code: extract( array( 'key.name' => 'value', 'somekey' => 'somevalue' ) ) Is there some way for me to retrieve the first value? E.g. ${'key.name'} or similar. I know I can retrieve the second value with $somekey but I am curious if its possible with . in the name.

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• Can PHP array passed POST method to catch in ASP.NET MVC?

  - by RendeRR

  Can PHP array passed POST method to catch in ASP.NET MVC? Query string: WebAccess/ArrayTest?val[]=1&val[]=2&val[]=3 I write: ActionResult ArrayTest (String[] val) But this only works if the query string to remove the "[]"

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