Convert List of longs to string array
What is the best way to convert a List of primitive longs to an array of strings? I think I'm looking for something fancier than writing my own loop, etc.. ...
arrays
More efficient: large array or many scalars
Working in an embedded (PIC) environment, programming in c. I have to keep track of 1000 values for a variable (history) and return the moving average of those values. I'm just wondering if it will be more efficient in terms of speed, ROM and RAM usage if I use an array or 1000 16bit variables. Is there a difinitive answer to that? O...
what is the best way to multiply arrays in php?
Hello lets say I have two arrays <?PHP $arr1 = array("a","b","c"); $arr2 = array("1","2","3"); function multiply_arrays($arr1,$arr2){ //what is the best way to do that in terms of speed and memory return $arr3; } ?> what is the best way to multiply them? the result should ...
PHP Built-in Method to Get Array Values Given a List of Keys
I have an 'dictionary' array such as this: $arr['a']=5; $arr['b']=9; $arr['as']=56; $arr['gbsdfg']=89; And I need a method that, given a list of the array keys, I can retrieve the corresponding array values. In other words, I am looking for a built-in function for the following methods: function GetArrayValues($arrDictionary,...
(undefined method `+@' for []:Array)
Hey Everyone, I'm getting a very strange error message when I try to iterate through an array of objects. The error is NoMethodError (undefined method `+@' for []:Array): Here is the code of that loop. #go through items and see if there are any corresponding offers #All matches are stored in a hash items.each do |itemsi| bestoff...
SQL Query to find ID's with as many hits as possible from an Array.
Hi everyone, English is not my native language so i'll try to explain as good as i can. I have a table with ID's in this table i also have account numbers. something like this: ID ACCOUNT 1 1000 1 1001 1 1002 2 1000 2 1001 3 1003 then i have an array (Posted from a form, like name="array[0]",name="array[1]",name="array[...
ASP Dictionary in array memory handling
I have a piece of code that takes several rows from a database and creates a dictionary object which I push into an array. do while index < rs.RecordCount or (not rs.EOF) set dict = Server.CreateObject("Scripting.Dictionary") for each x in rs.fields temp = x.value dict.add lcase(x.name), temp next set records(index) = ...
How can I modify a 2d array passed to a function?
Why does the following code give me a segmentation fault? #define MAXROWS 10 #define MAXCOLS 10 void getInput (int *data[MAXROWS][MAXCOLS]) { int rows, cols; int curRow, curCol; printf ("How many rows and cols?"); scanf ("%d %d", rows, cols); for (curRow = 0; curRow < rows; curRow++) { for (curCol = 0; curCol < cols; curC...
What needs finalization in a multidimensional dynamic array?
I use dynamic arrays a great deal and have no problems with the SetLength and Finalize procedures. I recently had cause to use dynamic arrays where each array element could itself contain a variable number of elements. The declaration is like this: TScheduleArray = array of array of array [1..DaysPerWeek] of TShiftType; The software...
Immutable arrays in .net (c#): Reasonable approach?
You know probably the following problem: You want to share a collection between two objects A and B (or similarly want to expose a collection by a property) and ... well, you realize that this is actually not a good idea since both A and B can then modify the collection and blah blah armageddon now ... But often you realize that you don...
Help returning C array to Java using JNA
I am not too familiar with C, but I need to use a C library in my java code. I have created the DLL and am able to access it just fine, but I am attempting to return an array of ints from the C code to the java code. In C I thought you could simply return a pointer to the array, but it's not working like I expect in my Java code. Here...
Simplest code to sort arrays in ruby?
I usually do something like array.sort{|a,b| a.something <=> b.something} How should I DRY this up? ...
How to define an empty object in PHP
with a new array I do this: $aVal = array(); $aVal[key1][var1] = "something"; $aVal[key1][var2] = "something else"; Is there a similar syntax for an object (object)$oVal = ""; $oVal->key1->var1 = "something"; $oVal->key1->var2 = "something else"; ...
Store String Array in MySql through java?
I have a String Array in a java program. I am using jdbc driver to store data in MySql. There is a reference variable "pstmt" that refers to a prepared statement now I want to call the following method: String [] items = {pen, ball, speaker, mic}; pstmt.setArray(1, ....); where "items" refer to String array but the method setArray...
Help: Loop for dynamic <option> getting it from an array.
Hi, I need a help in my code, I cant figure out how to loop values from array and putting them a list/menu. I need to loop the array the roomType and combine it with the rate so it would look some thing like this (e.g. Single Room (980.00)) the values of roomType and rate would be dynamic for every option. please see my code and let me...
Why doesn't my code append to the string within the loop?
I'm using jQuery, building a table through a loop. I thought the best way of doing this would be to create an array then do $(blah).html(table); var settings_table = '<open the table>'; $.each(settings, function(i, val){ var settings_table = settings_table+'<put stuff in it>'; }); var settings_table = settings_table+'<close it...
How to split a multidimensional array in PHP?
How can I take a multi-dimensional array like the below, and split it into multiple separate arrays? Additional challenge: Although I know there are two pairs in the example below (pageviews, visits), how can you do it assuming that you don't know the number of pairs in the array? For example, I may want to add "time on page" or "pages v...
Is there a built-in sortByKey() function in PHP?
Say,$arr contains multiple sub-arrays with the key "pos", $arr = sortByKey($arr,'pos'); After that the sub-array with smallest "pos" value will be ordered first,and so on. EDIT $sub1 = array('pos' => 2); $sub2 = array('pos' => 1); $arr = array($sub1,$sub2); $arr = sortByKey($arr,'pos'); After this function,$arr will be array($sub2...
how to convert byte[] to an ArrayList of Hashtables ?
Could someone please give me an example on how can I convert a byte[] to an ArrayList of Hashtables with C# ? (the byte[] represents the ArrayList of Hashtables that was previously serialized) Note: I'm running under Windows Mobile, which does not provide BinaryFormatter. ...
Ruby array manipulation based on index properties
I have an array of in Ruby. I want to: Get a subset of the elements based on their position in the array - say every 5th element. I can do this with each_index, or extend and create a select_with_index method. Perform some operation on the subset that depends on the entire subset - let's say subset.map{|element| subset.sum - element} T...