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  • casting doubles to integers in order to gain speed

    - by antirez
    Hello all, in Redis (http://code.google.com/p/redis) there are scores associated to elements, in order to take this elements sorted. This scores are doubles, even if many users actually sort by integers (for instance unix times). When the database is saved we need to write this doubles ok disk. This is what is used currently: snprintf((char*)buf+1,sizeof(buf)-1,"%.17g",val); Additionally infinity and not-a-number conditions are checked in order to also represent this in the final database file. Unfortunately converting a double into the string representation is pretty slow. While we have a function in Redis that converts an integer into a string representation in a much faster way. So my idea was to check if a double could be casted into an integer without lost of data, and then using the function to turn the integer into a string if this is true. For this to provide a good speedup of course the test for integer "equivalence" must be fast. So I used a trick that is probably undefined behavior but that worked very well in practice. Something like that: double x = ... some value ... if (x == (double)((long long)x)) use_the_fast_integer_function((long long)x); else use_the_slow_snprintf(x); In my reasoning the double casting above converts the double into a long, and then back into an integer. If the range fits, and there is no decimal part, the number will survive the conversion and will be exactly the same as the initial number. As I wanted to make sure this will not break things in some system, I joined #c on freenode and I got a lot of insults ;) So I'm now trying here. Is there a standard way to do what I'm trying to do without going outside ANSI C? Otherwise, is the above code supposed to work in all the Posix systems that currently Redis targets? That is, archs where Linux / Mac OS X / *BSD / Solaris are running nowaday? What I can add in order to make the code saner is an explicit check for the range of the double before trying the cast at all. Thank you for any help.

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  • which version of the code below is right?

    - by TheVillageIdiot
    Hi I found this function in a utilities code file: Version 1: public static bool IsValidLong(string strLong) { bool result = true; try { long tmp = long.Parse(strLong); } catch (Exception ex) { result = false; } return result; } I want to replace this (and validators for other types) with following: Version 2: public static bool IsValidLong(string strLong) { long l; return long.TryParse(strLong, out l); } which version is better and why?

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  • Read files via php

    - by Koka
    You all know about restrictions that exist in shared environment, so with that in mind, please suggest me a php function or something with the help of which I could stream my videos and other files. I have a lot of videos on the server, unlimited bandwidth and disk space, but I am limited in ram and cpu.

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  • Where to get pure C++ Lame MP3 encoder - PCM to MP3 example?

    - by Ole Jak
    So all I need is a simple function that sets it up (eating incoming PCM RATE (for example: rate near to 44100) It's channels (for example: 2) and -bits (for example: 16) and desirable 128 kb\s rate) and another one that takes PCM data and encodes it into pure MP3 frames. I know it looks like a silly homework task but I assure you - it is not. I hope it will be of help to all C++ developers starting with MP3s. So can anybody please help me with that?

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  • How can I read a file's contents directly with Perl's Net::FTP?

    - by muruga
    I want to get the file from one host to another host. We can get the file using the NET::FTP module. In that module we can use the get method to get the file. But I want the file contents instead of the file. I know that using the read method we can read the file contents. But how do I call the read function and how do I get the file contents?

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  • Get Xml Data Cross-Domain with JQuery

    - by Dänu
    Hey guys, is there a way to load XML Data Cross-Domain with JQuery (= client side)? $.get('http://otherdomain.com/data.xml', function(xml) { } The above doesn't work - do I have to rely on JSONP, or is there a way to load XML?

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  • backbone.js - Having multiple instances of the same view

    - by TrueWheel
    I am having problems having multiple instances in of the same view in different div elements. When I try to initialize them only the second of the two elements appear no matter what order I put them in. Here is the code for my view. var BodyShapeView = Backbone.View.extend({ thingiview: null, scene: null, renderer: null, model: null, mouseX: 0, mouseY: 0, events:{ 'click button#front' : 'front', 'click button#diag' : 'diag', 'click button#in' : 'zoomIn', 'click button#out' : 'zoomOut', 'click button#on' : 'rotateOn', 'click button#off' : 'rotateOff', 'click button#wireframeOn' : 'wireOn', 'click button#wireframeOff' : 'wireOff', 'click button#distance' : 'dijkstra' }, initialize: function(name){ _.bindAll(this, 'render', 'animate'); scene = new THREE.Scene(); camera = new THREE.PerspectiveCamera( 15, 400 / 700, 1, 4000 ); camera.position.z = 3; scene.add( camera ); camera.position.y = -5; var ambient = new THREE.AmbientLight( 0x202020 ); scene.add( ambient ); var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.75 ); directionalLight.position.set( 0, 0, 1 ); scene.add( directionalLight ); var pointLight = new THREE.PointLight( 0xffffff, 5, 29 ); pointLight.position.set( 0, -25, 10 ); scene.add( pointLight ); var loader = new THREE.OBJLoader(); loader.load( "img/originalMeanModel.obj", function ( object ) { object.children[0].geometry.computeFaceNormals(); var geometry = object.children[0].geometry; console.log(geometry); THREE.GeometryUtils.center(geometry); geometry.dynamic = true; var material = new THREE.MeshLambertMaterial({color: 0xffffff, shading: THREE.FlatShading, vertexColors: THREE.VertexColors }); mesh = new THREE.Mesh(geometry, material); model = mesh; // model = object; scene.add( model ); } ); // RENDERER renderer = new THREE.WebGLRenderer(); renderer.setSize( 400, 700 ); $(this.el).find('.obj').append( renderer.domElement ); this.animate(); }, Here is how I create the instances var morphableBody = new BodyShapeView({ el: $("#morphable-body") }); var bodyShapeView = new BodyShapeView({ el: $("#mean-body") }); Any help would be really appreciated. Thanks in advance.

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  • Creating an accurate php search engine to search database

    - by Adam
    Ok, I attempted at making my own search function which doesnt work very well. It consists of eliminating useless words such as "how" "you" "to" then using a premade Stemmer class that reduces words to their root so "Appointments" searches "appoint" However in the end I'm really only searching keywords and the results are not very accurate. Are there open source search engines that i can implement for free?

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  • jQuery: Giving each matched element an unique ID

    - by AnGafraidh
    I am writing an 'inline translator' application to be used with a cloud computing platform to extend non-supported languages. The majority of this uses jQuery to find the text value, replace it with the translation, then append the element with a span tag that has an unique ID, to be used elsewhere within the application. The problem arises however, when there are more than one element, say , that have the exact same value to be translated (matched elements). What happens in the function in question is that it puts all matched elements in the same span, taking the second, third, fourth, etc. out of their parent tags. My code is pretty much like this example: <script src='jquery-1.4.2.js'></script> <script> jQuery.noConflict(); var uniqueID='asdfjkl'; jQuery(window).ready(function() { var myQ1 = jQuery("input[id~=test1]"); myClone=myQ1.clone(); myClone.val('Replaced this button'); myQ1.replaceWith('<span id='+uniqueID+'></span>'); jQuery('#'+uniqueID).append(myClone); }); </script> <table> <tr><td> <input id='test1' type='button' value="I'm a button!"></input> &nbsp; <input id='test2' type='button' value="And so am I"></input> </tr></td> <tr><td> <input id='test1' type='button' value="I'm a button!"></input> </tr></td> </table> As a workaround, I've experimented with using a loop to create a class for each span, rising in increment until jQuery("input[id~=test1]").length, but I can't seem to get anything I do to work. Is there any way to give each matched element an unique ID? My fluency in jQuery is being put to the test! Thanks for any help in advance. Aaron

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  • Error with jquery-autocomplete in rails

    - by alexBrand
    I've been trying to get autocomplete to work, however, I am getting a weird javascript error in the firebug console... I used the https://github.com/crowdint/rails3-jquery-autocomplete gem. The error I am getting reads: $(e).autocomplete is not a function Here are the scripts i am including in my html: <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script> <script src="/javascripts/autocomplete-rails.js?1294035084" type="text/javascript"></script> Thanks

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  • using json object data in jquery select

    - by Ratna
    {"names": [ {"patientName": "Ratna"}, {"patientName": "raju" }, {"patientName": "krishna"}, {"patientName": "kishore"}, {"patientName": "Kishore1"}, {"patientName": "mahesh"} ]} this is the JSON object i'm getting from Ajax call so now i want to add all patientName values to select box through jquery can any one tell me how to accomplish this ?? here i'm using $.ajax() function for ajax call thanks in advance

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  • Post data to MVC3 controller without pagerefresh

    - by Smooth
    I have this script that basically has 4 select boxes, what I want is that for the 2 top select boxes, he submits the optionvalue that is selected to an action (which can be found at "ProductKoppeling/ProductKoppelingPartial"), I want to let him submit this data when I click on an option but without page refresh. I tried JSON and I tried Ajax, but I didn't get it working.. How should i do this? <script language="javascript" type="text/javascript"> function delete_1() { var answer = confirm("U staat op het punt dit product te verwijderen, wilt u doorgaan?") if (answer) { document.getElementById('Actie_1').value = '5'; document.getElementById('hpg_submit').submit(); } } function delete_2() { var answer = confirm("U staat op het punt dit product te verwijderen, wilt u doorgaan?") if (answer) { document.getElementById('Actie_2').value = '6'; document.getElementById('pg_submit').submit(); } } function delete_3() { var answer = confirm("U staat op het punt dit product te verwijderen, wilt u doorgaan?") if (answer) { document.getElementById('Actie_3').value = '6'; document.getElementById('p_submit').submit(); } } </script> <div style="width: 500px; float: left;"> @using (Html.BeginForm("ProductKoppelingPartial", "ProductKoppeling", FormMethod.Post, new { id = "onload_submit" })) { @Html.DropDownList("Klant.Id", (ViewBag.Klant as SelectList), new { onchange = "document.getElementById('onload_submit').submit()" }) } <div style="clear: both"></div> <div style="float: left;"> <b>Hoofdgroepen</b><br /> @using (Html.BeginForm("ProductKoppelingPartial", "ProductKoppeling", FormMethod.Post, new { id = "hpg_submit" })) { if (ViewBag.SelectedKlant != null) { <input type="hidden" name="Klant.Id" value="@ViewBag.SelectedKlant.Id" /> } <select style="width: 200px;" size="6" id="HoofdProductGroep" name="HoofdProductGroep.Id" onchange="document.getElementById('hpg_submit').submit();"> @foreach (var hpg in ViewBag.HoofdProductGroep) { if (ViewBag.SelectedHPG != null) { if (hpg.Id == ViewBag.SelectedHPG.Id) { <option value="@hpg.Id" selected="selected">@hpg.Naam</option> } else { <option value="@hpg.Id">@hpg.Naam</option> } } else { <option value="@hpg.Id">@hpg.Naam</option> } } </select> <input type="hidden" name="Actie" id="Actie_1" value="0" /> <br /> <img src="../../Content/toevoegen.png" style="cursor: pointer; width: 30px;" onclick="document.getElementById('Actie_1').value='1';document.getElementById('hpg_submit').submit();" /> <img src="../../Content/bewerken.png" style="cursor: pointer; float: none; width: 30px;" onclick="document.getElementById('Actie_1').value='2';document.getElementById('hpg_submit').submit();" /> <img src="../../Content/verwijderen.png" style="cursor: pointer; float: none; width: 30px;" onclick="delete_1()" /> } </div> <div style="float: right;"> <b>Groepen</b><br /> @using (Html.BeginForm("ProductKoppelingPartial", "ProductKoppeling", FormMethod.Post, new { id = "pg_submit" })) { if (ViewBag.SelectedHPG != null) { <input type="hidden" name="HoofdProductGroep.Id" value="@ViewBag.SelectedHPG.Id" /> } if (ViewBag.SelectedKlant != null) { <input type="hidden" name="Klant.Id" value="@ViewBag.SelectedKlant.Id" /> } <select size="6" style="width: 200px;" id="ProductGroep_Id" name="ProductGroep.Id" onchange="document.getElementById('pg_submit').submit();"> @foreach (var pg in ViewBag.ProductGroep) { if (ViewBag.SelectedPG != null) { if (pg.Id == ViewBag.SelectedPG.Id) { <option value="@pg.Id" selected="selected">@pg.Naam</option> } else { <option value="@pg.Id">@pg.Naam</option> } } else { <option value="@pg.Id">@pg.Naam</option> } } </select> <input type="hidden" name="Actie" id="Actie_2" value="0" /> <br /> <img src="../../Content/toevoegen.png" style="cursor: pointer; width: 30px;" onclick="document.getElementById('Actie_2').value='3';document.getElementById('pg_submit').submit();" /> <img src="../../Content/bewerken.png" style="cursor: pointer; float: none; width: 30px;" onclick="document.getElementById('Actie_2').value='4';document.getElementById('pg_submit').submit();" /> <img src="../../Content/verwijderen.png" style="cursor: pointer; float: none; width: 30px;" onclick="delete_2()" /> } </div> <div style="clear: both; height: 25px;"></div> @using (Html.BeginForm("Save", "ProductKoppeling", FormMethod.Post, new { id = "p_submit" })) { <div style="float: left"> <b>Producten</b><br /> <select size="18" style="width: 200px;" name="Product.Id"> @foreach (var p in ViewBag.Product) { <option value="@p.Id">@p.Naam</option> } </select> @if (ViewBag.SelectedPG != null) { if (ViewBag.SelectedPG.Id != null) { <input type="hidden" name="ProductGroep.Id" value="@ViewBag.SelectedPG.Id" /> } } <input type="hidden" name="Actie" id="Actie_3" value="0" /> <br /> <img src="../../Content/toevoegen.png" style="cursor: pointer; width: 30px;" onclick="document.getElementById('Actie_3').value='1';document.getElementById('p_submit').submit();" /> <img src="../../Content/bewerken.png" style="cursor: pointer; float: none; width: 30px;" onclick="document.getElementById('Actie_3').value='2';document.getElementById('p_submit').submit();" /> <img src="../../Content/verwijderen.png" style="cursor: pointer; float: none; width: 30px;" onclick="delete_3()" /> <br /> </div> <div style="float: left; width: 100px;"> <center> <br /><br /><br /><br /> <a style="cursor: pointer; float: none; color: blue; font-size: 30px;" onclick="document.getElementById('p_submit').submit();">»</a> <br /><br /><br /><br /><br /><br /><br /><br /><br /> <a style="cursor: pointer; float: none; color: blue; font-size: 30px;" onclick="document.getElementById('pgp_submit').submit();">«</a> </center> </div> } <div style="float: right;"> <b>Producten in groepen</b><br /> @using (Html.BeginForm("Delete", "ProductKoppeling", FormMethod.Post, new { id = "pgp_submit" })) { <select size="18" style="width: 200px;" name="ProductGroepProduct.Id"> @foreach (var pgp in ViewBag.ProductGroepProduct) { if (pgp != null) { if (pgp.Product != null) { <option value="@pgp.Id">@pgp.Product.Naam</option> } } } </select> } </div>

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  • receive string with chars

    - by Meloun
    Hi all, i am quite new in python. I am receiving (through pyserial) string with data values. How can I parse these data to particular data structure? I know that 0-1 byte : id 2-5 byte : time1 =>but little endian (lsb first) 6-9 byte : time2 =>but little endian (lsb first) and I looking for a function: def parse_data(string): data={} data['id'] = ?? data['time1'] = ?? data['time2'] = ?? return data thanks

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  • Facebook-like invitation page for my categorization service

    - by ming yeow
    Hi folks, i am working on a categorization service. I want the experience to behave similarly to Facebook's invite/tagging function Does anyone have any experience implementing this? This includes: autocompleting based on list below if auto-complete does not turn up anything, give chance to do something else with that data Would be super happy to hear any experiences, plugins that might be useful in helping me build this out

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  • loading method based on URL

    - by steeped
    I am trying to build a small mvc-based application. How do I call a method in a class based on a query string? For example, the $_GET query string is being set as load_master_form http://www.domain.com/settings/load_master_form And to call the method within the settings class, I am doing: function __construct(){ $this->{$_GET['method']}(); } But obviously that doesn't work - it just isn't possible to load a method like that. So how would it be done?

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  • Scala Hoogle equivalent?

    - by Alexey Romanov
    Hoogle allows you to search many standard Haskell libraries by either function name, or by approximate type signature. I find it very useful. Is there anything like Hoogle for Scala? Search in ScalaDoc 2 only finds types and packages by name.

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  • jQuery action being called when selector isn't met?

    - by dougoftheabaci
    I've been working on a prototype for a client's web site and I've run into a rather significant snag. You can view the prototype here. As you can see, the way it works is you can scroll a set of slides horizontally and, by clicking one, open a stack containing yet more slides. If you then click again on an image in that stack it opens up a lightbox. Clicking on another stack or the close button will close that stack (and open another, as case may be). That all works great. However you get some weird behavior if you do the following: Click to open any stack. Click to open an image's light box (this works best if you click on the image that's level with the main list). Close the light box and the stack either by clicking the close button or clicking on another stack. Click back to the first stack. Instead of reopening the stack, you get the lightbox. This confuses me as the light box should only ever be called if there is a class on the containing UL and that class is removed when the lightbox is closed. I've checked and double-checked this, it's definitely missing. Here are the respective functions: $("ul.hide a.lightbox").live("click",function(){ $("ul.show").removeClass("show").addClass("hide"); $(this).parent().parent().removeClass("hide").addClass("show"); $("ul.hide").animate({opacity: 0.2}); $("ul.show").animate({opacity: 1}); $("#next").animate({opacity: 0.2}); $("#prev").animate({opacity: 0.2}); return false; }); $("ul.show a.lightbox").live("click",function(){ $(this).fancybox().trigger("click"); return false; }); As you can see, in order for the lightbox to be called the containing UL has to have the class of show. However, if you check it with Firebug it won't. For those who are curious, the added .trigger("click"); is because the lightbox will require a double-click to launch otherwise. Any idea how I can fix this?

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  • jQuery: submit a form when the checkbox is selected

    - by Patrick
    hi, I have a form, and I want automatically to update it when I click on a checkbox. This is my current code: $('.option img').click(function() { $("#views-exposed-form-Portfolio-page-1").submit(); }); However, the selected checkbox is not stored before the form is submitted, and so the selection has not effect. thanks

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  • Appending a prefix when using join in Perl

    - by syker
    I have an array of strings that I would like to use the join function on. However, I would like to prefix each string with the same string. Can I do this in one line as opposed to iterating through the array first and changing each value before using join?

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  • Insert into textarea | JavaScript

    - by Wayne
    I'm trying to insert the image url where the point of the is to be when editing the textarea value. function addImageURL() { var imageurl = prompt("Enter image URL", "Your name") var post = document.getElementById("message-put").value; document.getElementById('message-put').value = post + '[img]' + imageurl + '[/img]'; } This code grabs the value inside the adds the image url next to it which I don't want, I need it to insert it where the point was when editing the textarea Thanks

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  • Javascript Submit

    - by Mick
    Hi I have the following script in my form function pdf() { var frm = document.getElementById("form1"); frm.action = "http://www.abbysoft.co.uk/index.php"; frm.target="_blank" frm.submit() } this is called from the following in my form <input class="buttn" type="button" value="Test" onclick="pdf()" The code work up to the frm.submit() but it will not submit Can anyone offer any advice please ?

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  • Could anyone suggest a good RSS feeder?

    - by Noor
    Well I'm making a site that will function sort of like iGoogle does and I wanted to be able to let the users enter RSS-feeds. What i'm looking for is an RSS-feeder that is as customisable as possible (when it comes to looks) and it should be free since this is just a hobbyproject for now.. :)! Thanks guys

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