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• Javascript for loop efficiency

  - by Misha Moroshko

  Is for (var i=0, cols=columns.length; i<cols; i++) { ... } more efficient than for (var i=0; i<columns.length; i++) { ... } ? In the second variant, is columns.length calculated each time the condition i<columns.length is checked ?

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• how to interleaving lists

  - by user2829177

  I have two lists that could be not equal in lengths and I want to be able to interleave them. I want to be able to append the extra values in the longer list at the end of my interleaved list.I have this: a=xs b=ys minlength=[len(a),len(b)] extralist= list() interleave= list() for i in range((minval(minlength))): pair=a[i],b[i] interleave.append(pair) flat=flatten(interleave) c=a+b if len(b)>len(a): remainder=len(c)-len(a) for j in range(-remainder): extra=remainder[j] extralist.append(extra) if len(a)>len(b): remainder=len(c)-len(b) for j in range(-remainder): extra=remainder[j] final=flat+extralist return final but if I test it: >>> interleave([1,2,3], ["hi", "bye",True, False, 33]) [1, 'hi', 2, 'bye', 3, True] >>> The False and 33 don't appear. What is it that Im doing wrong?

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• javascript for (i = 0; i < XXX.length; i++) -> length question

  - by Fernando SBS

  for (m = 0; m < troopsCount.length; m++) { //FM_log(7,"i="+i+" m="+m); //FM_log(7,"tipoTropaPrioritaria[m] = "+tipoTropaPrioritaria[m]); //FM_log(7,"troopsCount[m] = "+troopsCount[m]); //FM_log(7,"availableTroops[m] = "+availableTroops[m]); if ((tipoTropaPrioritaria[m] == null || tipoTropaPrioritaria[m] == "undefined") || (troopsCount[m] == null || troopsCount[m] == "undefined") || (availableTroops[m] == null || availableTroops[m] == "undefined")) return "alternaTropas(): ERRO - tipoTropaPrioritaria[m] || troopsCount[m] || availableTroops[m] null ou undefined"; if ((parseInt(tipoTropaPrioritaria[m]) != 0) && (parseInt(troopsCount[m]) != 0)) { naoServe = true; break; } else { if ((parseInt(availableTroops[m])) < (parseInt(troopsCount[m]))) { naoServe = true; break; } else if (m < troopsCount.length) { naoServe = true; } else { //means m >= troopsCount.length naoServe = false; } } } my question is: the last statement else { //means m >= troopsCount.length naoServe = false; } will it ever be evaluated since for (m = 0; m < troopsCount.length; m++) ???

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• Rails - Displaying Large Set of Data in a Table / Start new column after X rows

  - by ChrisWesAllen

  Hi, I trying to display a large set of checkboxes in my rails app and didnt knwo the syntax for displaying like 15 rows then after starting a new column. I have a model with about 120 entries. Currently, I have it being displayed in the view as.... <% for interest in Interest.find(:all) %> <%= check_box_tag Blah Blah Blah %> <%= interest.name %> <% end %> How can I make it so it makes a table and after every 15 or so rows make a new column???

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• Java for loop with multiple incrementers

  - by user2517280

  Im writing a program which combines the RGB pixel values for 3 images, e.g. red pixel of image 1, green pixel of image 2 and blue pixel of image 3 and I want to then create a final image of it. Im using the code below, but this seems to be incrementing x2 and x3 whilst x1 is the same, i.e. not giving the right pixel value for same co-ordinate for each image. for (int x = 0; x < image.getWidth(); x++) { for (int x2 = 0; x2 < image2.getWidth(); x2++) { for (int x3 = 0; x3 < image3.getWidth(); x3++) { for (int y = 0; y < image.getHeight(); y++) { for (int y2 = 0; y2 < image2.getHeight(); y2++) { for (int y3 = 0; y3 < image3.getHeight(); y3++) { So I was wondering if anyone can tell me how to iterate through each of the 3 images on the same co-ordinate, so for example read 1, 1 of each image and record the red, green and blue value accordingly. Apologies if it doesnt make complete sense, its a bit hard to explain. I can iterate the values for one image fine but when I add in another, things start to go a bit wrong as obviously its quite a bit more complicated! I was thinking it might be easier to create an array and replace the according values in that just not sure how to do that effectively either. Thanks

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• How to get REALLY fast python over a simple loop

  - by totallymike

  I'm working on a spoj problem, INTEST. The goal is to specify the number of test cases (n) and a divisor (k), then feed your program n numbers. The program will accept each number on a newline of stdin and after receiving the nth number, will tell you how many were divisible by k. The only challenge in this problem is getting your code to be FAST because it k can be anything up to 10^7 and the test cases can be as high as 10^9. I'm trying to write it in python and having trouble speeding it up. Any ideas? import sys first_in = raw_input() thing = first_in.split() n = int(thing[0]) k = int(thing[1]) total = 0 i = 0 for line in sys.stdin: t = int(line) if t % k == 0: total += 1 print total

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• Simple loop, which one I would get more performance and which one is recommended? defining a variable inside a loop or outside of it?

  - by Grego

  Variable outside of the loop int number = 0; for(int i = 0; i < 10000; i++){ number = 3 * i; printf("%d",number); } or Variable inside of the loop for(int i = 0; i < 10000; i++){ int number = 3 * i; printf("%d",number); } Which one is recommended and which one is better in performance? Edit: This is just an example to exhibit what I mean, All I wanna know is if defining a variable inside a loop and outside a loop means the same thing , or there's a difference.

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• Stopping a SoundPlayer loop at the local level

  - by EvanRyan

  I'm working on setting up an alarm that pops up as a dialog with multiple sound file options the user can choose from. The problem I'm having is creating a sound player at the local level that I can close with a button. The problem I'm having is that the sound keeps looping when I close the form because the SoundPlayer doesn't exist within the button click event. here's what I have: void callsound() { if (SoundToggle == 0) // if sound enabled { if ((SoundFile == 0) && (File.Exists(@"attention.wav"))) { System.Media.SoundPlayer alarm = new System.Media.SoundPlayer(@"attention.wav"); alarm.PlayLooping(); } if ((SoundFile == 1) && (File.Exists(@"aahh.wav"))) { System.Media.SoundPlayer alarm = new System.Media.SoundPlayer(@"aahh.wav"); alarm.PlayLooping(); } } private void button1_Click(object sender, EventArgs e) { //alarm.Stop(); Only works if SoundPlayer declared at class level this.Close(); } Is there a way I can do what I want to do by declaring the SoundPlayer instances where I am? Or is there a way to declare it at the class level, and still be able to change the sound file based on user settings?

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• C input loop for shell

  - by AustinM

  So I'm working on creating a very simple C program that just preforms shell commands. This is what I have so far: #include <stdio.h> int main() { char input[30]; fputs("$ ", stdout); fflush(stdout); fgets(input, sizeof input, stdin); system(input); } It works, but only for one command. For example if I compile and type ./cmd I get the $ prompt. If I type ls I get what I'm supposed to get. But then it exits and goes back to the regular system shell. How can I make it so after the user types a command it goes back to the "$" input.

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• Bash: for loop, copy, backup

  - by sixtyfootersdude

  Hey, not 100% sure what this error means. % for f in "*" ; do cp $f ../backup/backup$f ; done cp: ../backup/backup* not found The purpose is to copy all the files into a folder into a backup folder and rename the files to backup.

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• jquery for each function

  - by jonathan p

  I have added a show more or less function to a div - this all works fine however now i need to only allow this functionality if a element is over a certain height in this case. there are numerous classes of the same so i need to do the check on each element. although i am having problems getting it to work see code below : $(document).ready(function() { $(".less").hide(); $(".more").each(function() { var actualHeight = ($(this).parent().parent().find('.appsList').height()); if (actualHeight < 150) { $(".more").hide(); } }); $(".more").click(function() { var paragraphHeight = ($(this).parent().parent().find('.appsList').height()); if (paragraphHeight > 150) { $(this).parent().parent().find('.appsHolderBody').animate({height:(paragraphHeight + 100) }); $(this).hide('slow'); $(this).parent().find('.less').show(); } return false; }); $(".less").click(function() { $(this).parent().parent().find('.appsHolderBody').animate({height:190 }); $(this).hide('slow'); $(this).parent().find('.more').show(); return false; }); }); Any help would be greatly appreciated - please note when i am targeting the parent using .parent.parent i know its not pretty but could'nt get it to run using eq(4) for some reason. so the main problem is with this part of code $(".more").each(function() { var actualHeight = ($(this).parent().parent().find('.appsList').height()); if (actualHeight < 150) { $(".more").hide(); } it hides all of the elements $(".more") instead of the ones that match the condition. html as requested <div class="appsHolder"> <div class="appsHolderBody"> <h5 class="appTitle">General Apps</h5> <ul class="appsList"> <li class="mainAppList">Resource Manager</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Resource Manager</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> </ul> </div> <div class="appsHolderExpander"> <a href="" class="more">More <img src="/wps/PA_applicationsintros/./img/downArrow.png" /></a> <a href="" class="less">Less <img src="/wps/PA_applicationsintros/./img/upArrow.png" /></a> </div> </div> <div class="appsHolderAdvertising"> <div class="appsHolderBody"> <h5 class="appTitle">Advertising Apps</h5> <ul class="appsList"> <li class="mainAppList">ATEX</li> <li><a href="">Launch</a> <a href="">Info</a></li> </ul> </div> <div class="appsHolderExpander"> <a href="" class="more">More <img src="/wps/PA_applicationsintros/./img/downArrow.png" /></a> <a href="" class="less">Less <img src="/wps/PA_applicationsintros/./img/upArrow.png" /></a> </div> </div> cheers in advance

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• Problem with loop MATLAB

  - by Jessy

  no time scores 1 10 123 2 11 22 3 12 22 4 50 55 5 60 22 6 70 66 . . . . . . n n n Above a the content of my txt file (thousand of lines). 1st column - number of samples 2nd column - time (from beginning to end ->accumulated) 3rd column - scores I wanted to create a new file which will be the total of every three sample of the scores divided by the time difference of the same sample. e.g. (123+22+22)/ (12-10) = 167/2 = 83.5 (55+22+66)/(70-50) = 143/20 = 7.15 new txt file 83.5 7.15 . . . n so far I have this code: fid=fopen('data.txt') data = textscan(fid,'%*d %d %d') time = (data{1}) score= (data{2}) for sample=1:length(score) ..... // I'm stucked here .. end ....

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• php - Loop output in two diffrent divs?

  - by Stan

  I want to output my sql rows on each side of a line, without breaking the line. Forexample the html/css code i would like to end up with is something like this: <div id='container'> <div style='float:left;'> Even loops here.. </div> <div id='line' style='float:left;'> </div> <div style='float:right;'> Uneven loops here.. </div> <div style='clear:both;'></div> </div> Is there a way to output the sql rows in two diffrent divs?

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• For each loop not reading in the last item

  - by Gandalf StormCrow

  I'm trying to read in a multi line string then split it then print it .. here is the string : 1T1b5T!1T2b1T1b2T!1T1b1T2b2T!1T3b1T1b1T!3T3b1T!1T3b1T1b1T!5T1*1T 11X21b1X 4X1b1X When I split the string with ! I get this without the last line string : 1T1b5T 1T1b5T1T2b1T1b2T 1T2b1T1b2T1T1b1T2b2T 1T1b1T2b2T1T3b1T1b1T 1T3b1T1b1T3T3b1T 3T3b1T1T3b1T1b1T 1T3b1T1b1T5T1*1T 5T1*1T11X21b1X 11X21b1X Here is my code : import java.io.BufferedInputStream; import java.util.Scanner; public class Main { public static void main(String args[]) { Scanner stdin = new Scanner(new BufferedInputStream(System.in)); while (stdin.hasNext()) { for (String line : stdin.next().split("!")) { System.out.println(line); for (int i = 0; i < line.length(); i++) { System.out.print(line.charAt(i)); } } } } } Where did I make the mistake, why is not reading in the last line? After I read in all lines properly I should go trough each line if I encounter number I should print the next char the n times the number I just read, but that is long way ahead first I need help with this. Thank you

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• Loading XML with possible infinite tags

  - by Firstmate

  (I'm doing this in AS3, but I'm sure the answer could be given in psuedocode) Basically, I have a XML file similar to: <Main> <Event> <Name>Blah</Name> <Event> Name>Blah2</Name> <Event> <Name>Blah3</Name> ... </Event> </Event> </Event> </Main> Yeah, to some extent it's poor design. But the idea I'm going for is that any Event has the potential to compromise of other Events and this idea kinda loops. Any ideas on how to do this?

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• How do I loop through a SimpleXML object in PHP

  - by Aditya

  I have a simpleXml object and want to read the data from the object , I am new to PHP and dont quite know how to do this. The object details are as follows. I need to read [description] and [hours]. Thankyou. SimpleXMLElement Object ( [@attributes] = Array ( [type] = array ) [time-entry] = Array ( [0] = SimpleXMLElement Object ( [date] = 2010-01-26 [description] = TCDM1 data management: sort & upload NFP SubProducers list [hours] = 1.0 [id] = 21753865 [person-id] = 350501 [project-id] = 4287373 [todo-item-id] = SimpleXMLElement Object ( [@attributes] = Array ( [type] = integer [nil] = true ) ) ) [1] = SimpleXMLElement Object ( [date] = 2010-01-27 [description] = PDCH1: HTML [hours] = 0.25 [id] = 21782012 [person-id] = 1828493 [project-id] = 4249185 [todo-item-id] = SimpleXMLElement Object ( [@attributes] = Array ( [type] = integer [nil] = true ) ) ). Please help me. I tries a lot of stuff , but not getting the syntax right.

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• Attaching functions to elements in a loop

  - by user435377

  I have the following HTML and JavaScript it works for the first set of elements when I have a '1' in the selector but when I replace the '1' with an 'i' it doesn't attach itself to any of the elements. Any ideas as to why this might not be working? (the script is meant to add the first 3 columns of each row and display it in the fourth) <html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js" type="text/javascript"></script> <script> $(document).ready(function(){ for (i = 2; i <= 14; i++) { $("#Q19_LND_"+i).keyup(function(){ $("#autoSumRow_"+i).val(Number($("#Q19_LND_"+i).val()) + Number($("#Q19_CE_"+i).val()) + Number($("#Q19_SOLSD_"+i).val())); }); $("#Q19_CE_"+i).keyup(function(){ $("#autoSumRow_"+i).val(Number($("#Q19_LND_"+i).val()) + Number($("#Q19_CE_"+i).val()) + Number($("#Q19_SOLSD_"+i).val())); }); $("#Q19_SOLSD_"+i).keyup(function(){ $("#autoSumRow_"+i).val(Number($("#Q19_LND_"+i).val()) + Number($("#Q19_CE_"+i).val()) + Number($("#Q19_SOLSD_"+i).val())); }); } }); </script> </head> <body> <table> <tr> <td><font face="arial" size="-1">Lap Roux-N-Y</font>&nbsp;</td> <td align="center"><input tabindex="1" type="text" name="Q19_LND_1" size="3" value="" id="Q19_LND_1"></td> <td align="center"><input tabindex="2" type="text" name="Q19_CE_1" size="3" value="" id="Q19_CE_1"></td> <td align="center"><input tabindex="3" type="text" name="Q19_SOLSD_1" size="3" value="" id="Q19_SOLSD_1"></td> <td align="center"><input tabindex="4" disabled type="text" name="autoSumRow_1" size="3" value="" id="autoSumRow_1"></td> </tr> <tr> <td nowrap width="1" bgcolor="#006699" colspan="9"><img src="/images/wi/nothing.gif" width="1" height="1"></td> </tr> <tr> <td><font face="arial" size="-1">Lap Esophagectomy</font>&nbsp;</td> <td align="center"><input tabindex="5" type="text" name="Q19_LND_2" size="3" value="" id="Q19_LND_2"></td> <td align="center"><input tabindex="6" type="text" name="Q19_CE_2" size="3" value="" id="Q19_CE_2"></td> <td align="center"><input tabindex="7" type="text" name="Q19_SOLSD_2" size="3" value="" id="Q19_SOLSD_2"></td> <td align="center"><input tabindex="8" disabled type="text" name="autoSumRow_2" size="3" value="" id="autoSumRow_2"></td> </tr> <tr> </table> </body> </html>

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• Appending item to lists - python

  - by ariel

  I have a list lets say a=[[1,2],[3,4],[5,6]]. I want to add to each item in a the char 'a'. when I use a=[x.append('a') for x in a] it return [None,None,None]. But if I use a1=[x.append('a') for x in a] then it do someting odd. a and not a1 is [[1,2,a],[3,4,a],[5,6,a]]. I don't understand why the first return [None, None, None] nor why the second works on a.

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• Type casting problem with java for-each loop

  - by pharma_joe

  Hi, I have traced an issue with an application I am developing, it is giving me a type cast exception. Funny thing is it is saying it cannot cast "entities.Movie cannot be cast to entities.Movie"?! movies is an ArrayList. try { movies = getMovies(); } catch (Exception e) { e.printStackTrace(System.out); } finally { try { for (Movie movie : movies) { output.append(" <tr>\n"); output.append(" <td>" + movie.getId() + "</td>"); output.append(" </tr>\n"); } } catch (Exception e) { e.printStackTrace(System.out); } }

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• JS and Jquery problem

  - by Sonny

  hi i got the problem the script.js gives me <div id="gracze"> <div id="10" class="char" style="z-index: 19; top: 592px; left: 608px; "></div> <div id="14" class="char" style="z-index: 25; top: 784px; left: 608px; "></div> </div> instead <div id="gracze"> <div id="4" class="char" ... ></div> <div id="10" class="char" style="z-index: 19; top: 592px; left: 608px; "></div> <div id="14" class="char" style="z-index: 25; top: 784px; left: 608px; "></div> </div> get_players.php 4/62/6 10/19/19 14/19/25 script.js function get_players() { $.ajax({ type: "POST", url: "get_players.php", dataType: "html", success: function(data) { var str = data; var chars = str.split("<br />"); var lol = chars.length; for(var i = lol; i--; ) { chars[i] = chars[i].split('/'); var o = document.getElementById(chars[i][0]); var aimt = i; if (!o) { if (aimt!=chars.length-1 && aimt != 0) { $('#gracze').html('<div id="'+chars[aimt][0]+'" class="char"></div>'+$('#gracze').html()); $('#'+chars[aimt][0]).css("top", chars[aimt][2]*32-16+"px"); $('#'+chars[aimt][0]).css("left", chars[aimt][1]*32+"px"); $('#'+chars[aimt][0]).css("z-index", chars[aimt][1]*32); } } else { $('#'+chars[aimt][0]).animate({ "top": chars[aimt][2]*32-16+"px", "left": chars[aimt][1]*32+"px" }, { duration: 275}); //$('#'+chars[aimt][0]).css("top", chars[aimt][1]*32-16+"px"); //$('#'+chars[aimt][0]).css("left", chars[aimt][2]*32+"px"); $('#'+chars[aimt][0]).css("z-index", chars[aimt][2]); } } }}); setTimeout("get_players();", 1000); } I think it's because of for(var i = lol; i--; ) {

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• C# Dictionary Loop Enhancment

  - by Toto

  Hi, I have a dictionary with around 1 milions items. I am constantly looping throw the dictionnary : public void DoAllJobs() { foreach (KeyValuePair<uint, BusinessObject> p in _dictionnary) { if(p.Value.MustDoJob) p.Value.DoJob(); } } The execution is a bit long, around 600 ms, I would like to deacrese it. Here is the contraints : MustDoJob values mostly stay the same beetween two calls to DoAllJobs() 60-70% of the MustDoJob values == false From time to times MustDoJob change for 200 000 pairs. Some p.Value.DoJob() can not be computed at the same time (COM object call) Here, I do not need the key part of the _dictionnary objet but I really do need it somewhere else I wanted to do the following : Parallelizes but I am not sure is going to be effective due to 4. Sorts the dictionnary since 1. and 2. (and stop want I find the first MustDoJob == false) but I am wondering what 3. would result in I did not implement any of the previous ideas since it could be a lot of job and I would like to investigate others options before. So...any ideas ?

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• Should Javascript's "for in" construct iterate the length property?

  - by Eric

  I'm making a bookmarklet, but I've encountered some wierd behaviour in IE8. The code causing the problem is this: var els = document.getElementById("my_id").getElementsByTagName("*"); for(var i in els) { alert(i+","+els[i]) } The first thing that is alerted is "length, n". This isn't the case in chrome: just in IE8. Interestingly, it seems to behave differently depending on whether the code goes in the console/address bar or the page itself. Is this standard behaviour?

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• Write a foreach loop for array of SimpleXMLElements

  - by mjames

  Hi, I am using the XPath in PHP 5 to parse a XML document. The problem I have is writing a foreach to correctly display the following array: XML document sample value 1 value 2 $xmlfile = 'link_to_file.xml'; $xmlRaw = file_get_contents($xmlfile); $xml = new SimpleXMLElement($xmlRaw); $install_files = $xml->xpath('//files'); foreach($install_files as $row) { echo $row['file']; } //var_dump for $row gives the following array(1) { [0]=> object(SimpleXMLElement)#21 (2) { ["file"]=> string(12) "value 1" ["folder"]=> string(8) "value 2" } } Ideally I would like to get the value by using $row['file'] or $row['folder']. Thanks for any help.

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• PHP loop position

  - by Jordan Pagaduan

  Can someone help me on this. I'm made an image uploader and i want the image to make another tr if it reach to 5 pics so it will not overflow. Here is my code: Can someone help me on this. I'm made an image uploader and i want the image to make another tr if it reach to 5 pics so it will not overflow. Here is my code: $dbc = mysql_connect("localhost" , "root" , "") or die (mysql_error()); mysql_select_db('blog_data') or die (mysql_error()); $sql = "SELECT * FROM img_uploaded"; $result = mysql_query($sql); while($rows=mysql_fetch_array($result)) { if ($rows) { echo "<tr><td><img src='user_images/".$rows['img_name'] . "' width='100' height='100'></td></tr>"; } else { echo "<td><img src='user_images/".$rows['img_name'] . "' width='100' height='100'></td>"; } }

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• VBA: For each cell does not work - Range is change and Out of context

  - by user1744638

  I have problem with for each cell. I have like that : Set cur_sheet = Worksheets("Sheet2") Set Rng = cur_sheet.Range("A1", "C1523") For Each cell In Rng.Cells a=1 next cell if there is row 370 that I have error message " Run time error 94" Invalid use of Null So I do not know what can I change. This row should be ok, filled with text. Why this FOR is not working properly and change range !! ? 370 rows are proceesed correctly, than it is error. Do you have any ideas ?

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