arrays

Do you have an example where the third parameter is necessary for array_search to work properly in PHP?

mixed array_search ( mixed $needle , array $haystack [, bool $strict ] ) If the third parameter strict is set to TRUE then the array_search() function will also check the types of the needle in the haystack . I don't see what it means,maybe an example can help? ...

How to simplify array value initialization

Hi, Several times a day I run into a problem where I need to dynamically initialize variables in a multidimensional array to prevent PHP throwing a notice because of an uninitialized variable. Code fragments like this are very common: if(!isset($profile[$year][$month][$weekday][$hour])) { $profile[$year][$month][$weekday][$hour] =...

PHP: Changing or padding an array's key names

I have the following array: $person = array('first_name' => 'Fred', 'last_name' => 'Flintstone'); I want to change/pad the keys so the array will end up as (note extra colons): $person = array('::first_name::' => 'Fred', '::last_name::' => 'Flintstone'); For some reason I'm drawing a blank on the simplest way to do this ...

Pushing a 1-D array onto a 2-D array in C

I am working on a queue data structure. The structure is: struct queue { char array[MAX_LENGTH][8]; int back; }; It is designed to store a list of MAX_LENGTH strings that are 7 chars long. I wish to push a 1D array of 8 chars (well, 7 chars and \0, just like the array in the struct). I have this push code: void push (struct queue ...

initializing a boolean array in java

I have this code public static Boolean freq[] = new Boolean[Global.iParameter[2]]; freq[Global.iParameter[2]] = false; could someone tell me what exactly i'm doing wrong here and how would i correct it? I just need to initialize all the array elements to Boolean false. thank you ...

String arrays in C

I have an array of strings which when I iterate through and print its elements gives me unexpected results. char currencies[][3] = {"EUR", "GBP", "USD", "JPY", "CNY"}; void show_currencies() { int i; for(i=0; i<5; i++) { printf("%s - ", currencies[i]); } } when I call show_currencies() I get this on output. E...

adding string objects to an array via loop

Hello, What i'm trying to do is create a template array class that will store values of a data type into an array. I have it working fine with int values, however working with string objects things start to break down. I've taken out the block of code and tried it on it's own and I do get the same error. I'm sure I've learnt this, and ...

Array call from key not working correctly

I'm trying to call to a specific part of an array with the key # and it's not working. I can output the array and see it... Array ( [6] => Array ( [0] => [email protected] [1] => [email protected] ) [7] => Array ( [0] => [email protected] [1] => [email protected] ...

Mergesort to sort three input arrays

A Merge algorithm merges two sorted input arrays into a sorted output array, by repeatedly comparing the smallest elements of the two input arrays, and moving the smaller one of the two to the output. Now we need to merge three sorted input arrays (A1, A2, and A3) of the same length into a (sorted) output array, and there are two method...

Inserting a new value in binary search tree

Using an algorithm Tree-Insert(T, v) that inserts a new value v into a binary search tree T, the following algorithm grows a binary search tree by repeatedly inserting each value in a given section of an array into the tree: Tree-Grow(A, first, last, T) 1 for i ← first to last 2 do Tree-Insert(T, A[i]) If the tree is i...

compare two arrays except element x,y,z (ruby)

is there any other simple,nicer way? require 'pp' a1 = ["02/28/10","Webinars","131","0","26 Feb 2010","0","3d, 8h, 49m, 18s"] a2 = ["02/20/10","Webinars","131","9","26 Feb 2010","0","3d, 8h, 49m, 18s"] def compare(array1,array2,ignore) tmp1 = Array.new tmp2 = Array.new 0.upto(array1.length-1) {|index| if !ignore.include?(in...

Creating (and accessing) an array in MIPS

I'm trying to create an array in MIPS Assembly, and then add all the elements together. However, when I try to assemble the following, it says Error in read_array line 1 position 7: ".word" directive cannot appear in text segment Assemble: operation completed with errors. Here's my assembly: list: .word 3, 2, 1, 0, 1, 2 li $t0...

Performance comparison of array of arrays vs multidimensional arrays

When I was using C++ in college, I was told to use multidimensional arrays (hereby MDA) whenever possible, since it exhibits better memory locality since it's allocated in one big chunk. Array of arrays (AoA), on the other hand, are allocated in multiple smaller chunks, possibly scattered all over the place in the physical memory whereve...

PHP: filtering 2 dimensional array / multidimensional array

hi all, i need help on filtering my 2 dimensional array such as example below: array(29) { [0]=> array(2) { [0]=> string(16) "Andorra La Vella" [1]=> string(2) "AD" } [1]=> array(2) { [0]=> string(16) "Andorra La Vella" [1]=> string(2) "AD" } [2]=> array(2) { [0]=...

how we check for null array in java

Hello, I am new bie to java unable to check for null. can you enlighten me on this. I have int array which has no elements I tried this code int[] k = new int[3]; if(k==null) { System.out.println(k.length); } but this condition always stay false and nerver prints "k.length" ...

Convert array to comma-delimited text

Apologies for this embarassingly simple question but I'm still relatively new to javascript. I have an array of names, something like var myArray = ['Hill M','Zhang F','Dong L', 'Wilkinson JS', 'Harris N']; I would like to return a string, with names separated by commas, but with "and" between the final two names, i.e. 'Hill M, Zhan...

C# string[] to int[]

Is there a way to convert string arrays to int arrays as easy as parsing an string to an int in C#. int a = int.Parse(”123”); int[] a = int.Parse(”123,456”.Split(’,’)); // this don't work. I have tried using extension methods for the int class to add this functionality myself but they don't become static. Any idea on how to do this f...

How to find every possible combination of an arbitrary number of arrays in PHP

I have an arbitrary number of nested arrays in php. For example: Array ( [0] => Array ( [0] => 36 [0] => 2 [0] => 9 ) [1] => Array ( [0] => 95 [1] => 21 [2] => 102 [3] => 38 ) [2] => Array ( ...

Are there any difference between the two statements?

array_key_exists($name, $defaults) isset($defaults[$name]) ...

Initializing Java object instances containing an array of objects

The following code is correct: public Sample mOboeSamples[] = { new Sample(1,1), new Sample(1,2) }; public Sample mGuitarSamples[] = { new Sample(1,1), new Sample(1,2) }; public SampleSet mSampleSet[] = { new SampleSet( "oboe", mOboeSamples ), new SampleSet( "guitar", mGuitarSamples) }; but I'd like to write ...