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• C++ vector that *doesn't* initialize its members?

  - by Mehrdad

  I'm making a C++ wrapper for a piece of C code that returns a large array, and so I've tried to return the data in a vector<unsigned char>. Now the problem is, the data is on the order of megabytes, and vector unnecessarily initializes its storage, which essentially turns out to cut down my speed by half. How do I prevent this? Or, if it's not possible -- is there some other STL container that would avoid such needless work? Or must I end up making my own container? (Pre-C++11) Note: I'm passing the vector as my output buffer. I'm not copying the data from elsewhere.

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• PHP $_REQUEST doesn't contain all $_GET varaibles

  - by pinky0x51

  Until today I thought that $_REQUEST always contains all variables form $_POST and $_GET. But today I had the strange experience that one variable is part of $_GET but not part of $_REQUEST. I played a little bit around with the URL which hands over the parameters and it seems like always the fist parameter is missing in the $_REQUEST array. Do you have any idea why this could happen? Thanks! URL: localhost/?app=files&getfile=ajax/newfile.php?dir=%2Ftest4&source=http%3A%2F%2Fl??ocalhost%2Fimg%2Flogo.svg&filename=logo.svg&requesttoken=e250827c341650990cd4

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• what's the javascript "var _gaq = _gaq || []; " for ?

  - by parvas

  The Async Tracking in google analytics looks like this: var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-XXXXX-X']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); About The first line var _gaq = _gaq || []; I think it ensures that if _gaq is already defined we should use it otherwise we should an array. Can anybody explain what this is for ? Also, does it matter if _gaq gets renamed ? in other words does google analytics rely on a global object named _gaq ? Thanks Parvas

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• Dynamic memory allocation with default values

  - by viswanathan

  class A { private: int m_nValue; public: A() { m_nValue = 0; } A(int nValue) { m_nValue = nValue); ~A() {} } Now in main if i call A a(2);// 2 will be assigned for m_nValue of object A. Now how do we do this if i want to define an array of objects. Also how do we do this if i dynamically create objects using operator new like A *pA; pA = new A[5];// while creating the object i want the parameterised constructor to be //called I hope the question is clear. Do let me know if more explanation is needed

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• Get length of a Dictionary

  - by StealthRT

  Hey all i am new at this Dictionary class in VB.net. I am wanting to reteive how many items in the Dictionary array there are: But doing this: Dim showNumber As Integer = tmpShows.Length Does not seem to yield 4 as it should? The code for the Dictionary i have is this: Dim all = New Dictionary(Of String, Object)() Dim info = New Dictionary(Of String, Object)() info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(3).ChildNodes(2).InnerText info!Shows = From tag In .SelectNodes(".//a[@class='thickbox']") Select New With {.Show = tag.Attributes("title").Value, .Link = tag.Attributes("href").Value} Dim tmpShows = all.Item(info!Station) Dim showNumber As Integer = tmpShows.Length What am i missing in order to get the 4 length i am looking for?

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• Why would you use a MyObject[] internally, but expose a List<MyObject>?

  - by timmyd

  I have come across a class that has an immutable property: MyObject[] allObjs The property is initialized like this: List<MyObject> objs = createAllMyObjects(); allObjs = objs.toArray(new MyObject[objs.size()]); When it is exposed through the accessor, it's done as a List: public List<MyObject> getAllMyObjects() { return Collections.unmodifiableList(Arrays.asList(allObjs)); } Why would a programmer do this? Is there a benefit that I don't know about? Performance is not a concern, as the array of objs will only ever number in a few dozen elements. It seems that we are going round and round in circles. The class is a sort of factory, so it's got a private constructor and exposes only static methods (not sure if this could be a reason for the madness).

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• [PHP] What exactly does it mean when $_FILES is empty?

  - by Mike

  I am working on a PHP upload script and when testing my error checks, I attempted to upload a 17MB TIFF file. When I do this the $_FILES array is empty. The script works fine for what I need it to do, which is to upload JPEG files. My solution is to test if $_FILES is empty or not before continuing with the upload script. Can anybody explain why $_FILES is empty when a TIFF is attempted to be uploaded? Is my solution, to check if $_FILES is empty or not, an okay one? Does this have something to do with settings in php.ini?

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• writing a single line of a file in C++ into two different arrays

  - by mekasperasky

  suppose a text file has 11001100 11001101 and i open the text file and take the input from the file as pt[0]=11001100, pt[1]=11001101.. but if i take the input from file as inpt it wont put it in two different arrays which is obvious but it takes the whole line . Thus I have to take another for loop and traverse through the whole string and when I find a null character i start putting into the second array . But how can I do it without putting it into a variable and traversing .. I mean directly from the file itself ..

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• Best way to get the values of a hash ordered by their respective keys? (Ruby)

  - by they changed my name

  Here's what I'm doing atm: test = { 'd' => 20, 'b' => 40, 'c' => 30, 'a' => 10, 'e' => 50 } f = [] test.to_a.each do |e| f << e[1] end puts f.sort.join(' ') Outputs: 10 20 30 40 50 Is there a more efficient/concise/better way to do this? And before someone says so, no, I can't use an array. :p

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• Perform regular expression on a PERL PDL variable

  - by Ahdee

  is it possible to perform a regular expression on a n-dimension PDL variable? For example I can add 100 to all the element by doing $a1 = pdl [1,2]; print $a1+100; However what if my array was a bunch of string that I would like to perform some task on, for example this fails. $a = pdl ['suze','david']; $a =~ s/suze/female/; print $a; not sure if this is even possible but thanks in advance. Ahdee

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• C++ - Implementing my own stream

  - by HardCoder1986

  Hello! My problem can be described the following way: I have some data which actually is an array and could be represented as char* data with some size I also have some legacy code (function) that takes some abstract std::istream object as a param and uses that stream to retrieve data to operate. So, my question is the following - what would be the easy way to map my data to some std::istream object so that I can pass it to my function? I thought about creating a std::stringstream object from my data, but that means copying and (as I assume) isn't the best solution. Any ideas how this could be done so that my std::istream operates on the data directly? Thank you.

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• What the best way to parse and find The specific data

  - by Khemlall Mangal

  Ok i have an issue i want to resolve. I have the following log file, and i want to parse it and find the errors and then compare them to user expected results and if it doesnt match then error or else pass.... the part that i am having trouble with is finding error within the log.... So in this example, within the log starting point is MASTER EXCLUSIONS:[ALL_EXCLUSIONS] errors: Then error can be in two format as show below. what the regular expressssion orcode that i can use to parse this and get pull out these error from count of 1 to end and i will just be able to take the array value for exammple results[1] - compare if == myresults[1] as an exmple.... outputting it in a file is ok too

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• Problem getting textfield.text from other view controller

  - by wesleydyson

  Hey guys, I'm trying to add a textfield.text entry to an array. I want to pull the textfield.text from a text field in another view. Here's my code. - (void)addBookmark{ MultiViewViewController *mainView = [[MultiViewViewController alloc] init]; if (mainView.addressTextField.text.length>1) { NSString *addedString = [[NSString alloc] initWithFormat:@"%@", mainView.addressTextField.text]; [bookmarksArray addObject:addedString]; NSLog(@"addBookmark being called %@", mainView.addressTextField.text); } [bmTableView reloadData]; } The NSLog says the mainView.addressTextField.text is (NULL). What am I doing wrong?

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• algorithms undirected graph twodegree[]

  - by notamathwiz

  For each node u in an undirected graph, let twodegree[u] be the sum of the degrees of u's neighbors. Show how to compute the entire array of twodegree[.] values in linear time, given a graph in adjacency list format. This is the solution for all u ? V : degree[u] = 0 for all (u; w) ? E: degree[u] = degree[u] + 1 for all u ? V : twodegree[u] = 0 for all (u; w) ? E: twodegree[u] = twodegree[u] + degree[w] can someone explain what degree[u] does in this case and how twodegree[u] = twodegree[u] + degree[w] is supposed to be the sum of the degrees of u's neighbors?

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• Possible to get jquery .serializeArray() values out by key name?

  - by chobo2

  Hi I am using the jquery .serializeArray() function and I send it to the server and that works all good.However I need to update a couple things on the client side that are serialized. So instead of doing another selector on the textbox I want to just grab it out of the serialized array. I am not sure how to do this Product=Test&Qty=50 So say if I have something like this. I can I do something like this var sendFormData = form.serializeArray(); var val = sendFormData["Product"].value; but this seems not to work. I only can get it to work when I do something like this var sendFormData = form.serializeArray(); var val = sendFormData[0].value; I really don't want to do it by index since that means if the order changes the values could be all wrong. If you could do it by like keyname then that would not be a problem.

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• In yii how to access other tables fields

  - by user1636115

  I am creating project in yii framework. I am having table as- Qbquestion QbquestionOption -questionId -optionId -question -questionId -userId -option -isPublished -isAnswer In QbquestionOption controller i want to access Qbquestion tables fields. I had written quesry as- $Question=Qbquestion::model()->findAllByAttributes(array("questionId"=>$number)); where $number is some random number. When i am using its fields as= $Question-isPublished then its giving error as "trying to get access to property of non-object" Statement var_dump($Question) is showing all record and all values of Qbquestion table. So how can i access records? Please help me

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• Use of Shl in assembly

  - by user3097712

  I have the following piece of lines and I do not understand that. Hope that someone can help me: ..... MOV EAX, DWORD PTR SS:[EBP-0x4] SHL EAX, 0x2 ADD EAX, DWORD PTR SS:[EBP-0x8] PUSH EAX .... Normally, it helps me to translate that into C language. But somehow I cant find a way to do it in that case. So, I only know that in the second line with SHL the register is multiplied by 4. And that the DWORD PTR SS:[EBP-0x4] looks like an array representation but i am not sure. I also find the following link x86 Assembler: shl and other instructions But I dont understand the answer there. So my question would be: What it is going on there? Thx...

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• New datatype which can have numbers upto 100 digits.

  - by ckv

  Note: This was an interview question and may not have an actual use case currently The question was to design a class that can store numbers which are very very large say each number can have 100 digits. This new class is a datatype like int. What are the different types of constructors, overloads and other functions that you would write. How can this be further extended to support really large floating point numbers. How this can be given to others so that they can reuse the same component with their own additional functionality. My answer consisted of 2 approaches 1. using array of integers to store every say 10 digits 2. using string itself to store the number and perform operations on individual numbers. What would be the best approach?

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• incompatible types in java

  - by user2975357

  Should I point out that I am a begginer at this? double averageMonthlyTemp() { double[] amt = new double[52]; int sum = 0; int index = 0; for (int i = 0; i < temp.length - 1; i = i + 7) { //where temp is an existiing //previously initialized array //of 365 elements, form 0 to 364 for (int j = 0; j < 7; j++) { sum = sum + temp[i + j]; if (j % 7 == 6) { double average = ((double) sum) / 7; amt[index] = average; index++; sum = (int) 0; } } } return amt; } When I try to compile, I get an "incompatible types" error, with the "amt" at return amt marked in red. Does somebody know why?

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• C# IndexOutOfRange issue, probably simple.

  - by MWC

  Banging my head off the wall due to this. I'm getting the error at cell[rcell] = repack[counter] even though I have 190 items in the repack array. private string csvtogrid(string input) { input = input.Replace("\r", ",").Substring(2).TrimEnd(',').Trim().Replace("\n", ",").Replace(",,,", ",").Replace(",,",","); string[] repack = input.Split(','); string[] cell = { }; int rcell = 1; for (int counter = 1; counter < repack.Length; counter++) { if (rcell < 4) { cell[rcell] = repack[counter]; rcell++; } procgrid.Rows.Add(cell[1], cell[2], cell[3]); rcell = 1; } richTextBox1.Text = input; return null; }

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• Why does `Array.length`, `Function.length`, `String.length`, etc return 1?

  - by zealoushacker

  While teaching my JavaScript class yesterday, my students and I came across some interesting functionality that I thought might be worth capturing in a question and the answer I've come to. Typing Array.length in the JS console in chrome returns 1. Likewise, Function.length returns 1. This is important because: Every function in JavaScript is actually a Function object. (MDN JS Ref: Function) Thus, Object.length and likely all other native objects will and should return 1 as the value of the length property. So, finally why is this behavior occurring?

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• C# Deserializing to a dictionary<string, Object>

  - by lovecraft

  I'm writing a C#/VB application to connect to a database and do stuff with the data. I was given this code to take a serialized byte array and deserialized it, which is then written to a Dictionary The line of code is: Dictionary<string, Object> DictionaryEmployee = (Dictionary<string, Object> Deserializer(byteArrayEmp)); The errors I'm getting are exceedingly unhelpful. "Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement" if I mouse over Object and "Using the generic type 'System.Collections.Generic.Dictionary' requires 2 type arguments if I mouse over Dictionary.

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• Converting byte[] of binary fixed point to floating point value?

  - by Sean Donohue

  I'm reading some data over a socket. The integral data types are no trouble, the System.BitConverter methods are correctly handling the conversion. (So there are no Endian issues to worry about, I think?) However, BitConverter.ToDouble isn't working for the floating point parts of the data...the source specification is a bit low level for me, but talks about a binary fixed point representation with a positive byte offset in the more significant direction and negative byte offset in the less significant direction. Most of the research I've done has been aimed at C++ or a full fixed-point library handling sines and cosines, which sounds like overkill for this problem. Could someone please help me with a C# function to produce a float from 8 bytes of a byte array with, say, a -3 byte offset?

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• read integers from a file into a vector in C++

  - by user2922063

  I am trying to read an unknown number of double values stored on separate lines from a text file into a vector called rainfall. My code won't compile; I am getting the error no match for 'operator>>' in 'inputFile >> rainfall' for the while loop line. I understand how to read in from a file into an array, but we are required to use vectors for this project and I'm not getting it. I appreciate any tips you can give on my partial code below. vector<double> rainfall; // a vector to hold rainfall data // open file ifstream inputFile("/home/shared/data4.txt"); // test file open if (inputFile) { int count = 0; // count number of items in the file // read the elements in the file into a vector while ( inputFile >> rainfall ) { rainfall.push_back(count); ++count; } // close the file

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• extract two parts of a string using regex in php

  - by Jubair

  Ok so I have this string: &lt;img src=images/imagename.gif alt='descriptive text here'&gt; and I am trying to split it up into the following two strings (array of two strings, what ever, just broken up). imagename.gif descriptive text here Note yes, its' actually the & lt; and not < same with the closing on the string. I know regex is the answer, but not the best at regext to know to pull it off in php.

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