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  • I need a decent alternative to c++ [closed]

    - by wxiiir
    I've learned php and c++, i will list the things i liked and didn't liked on each of them, how i decided to learn them in the first place and why i feel the need to learn a decent alternative to c++, i'm not a professional programmer and only do projects for myself. PHP - Decided to learn because i wanted to build a dynamic website, that i did and turned out very good, i even coded a 'not so basic' search engine for it that would display the results 'google style' and really fast, pretty cool stuff. PROS - Pretty consistent syntax for all stuff (minor caveats), great functionality, a joy for me to code in it (it seems to 'know' what i want it to do and just does it) CONS - Painfully slow for number crunching (which takes me to c++ that i only learned because i wanted to do some number crunching and it had to be screaming fast) C++ - Learned because number crunching was so slow in php and manipulating large amounts of data was very difficult, i thought, it's popular programming language and all, and tests show that it's fast, the basic stuff resemble php so it shouldn't be hard to pick up PROS - It can be used to virtually anything, very very fast CONS - Although fun to code at the start, if i need to do something out of the ordinary, memory allocation routines, pointer stuff, stack sizes etc... will get me tired really quick, syntax is a bit inconsistent some times (more caveats) I guess that from what i wrote you guys will understand what i'm looking for, there are thousands of languages out there, it's likely that one of them will suit my needs, i've been seeing stuff today and a friend of mine that is a professional programmer tried OCaml and Fortran and said that both are fast for numerical stuff, i've been inclined to test Fortran, but i need some more input because i want to have some other good 'candidates' to choose from, for example the python syntax seemed great to me, but then i found out from some tests that it was a lot slower than c++ and i simply don't want to twiddle my thumbs all day.

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  • ????????????3?????

    - by Feng
    ?? ??blog?????oracle????????????,??????????????,??????: ?????????. ???????: ??????????,????????; ????????????,?” ???”??. 1. OS swapping/paging ??????concurrency??????? Oracle?????????, ??latch/mutex???????”?”,??????????????/???(????????????,??????????????????). ????OS??????swapping/paging????,???????????,??latch/mutex???????,????????????hung/slow???. ??swapping/paging??????: a). ???? b). ??????; ?????, ?????????????? c). ?????/????? ????????????????? ???????: Lock SGA, ??SGA(???latch/mutex)???pin???????swapping???. ???SGA??????,????large page(hugepage)??,??latch/mutex??/?????. 2. SGA resizing?????????? ?AMM/ASMM??????????, shared pool?buffer cache?????component????????????,??ora-4031???.??????????,???????resize????????????(?latch/mutex?????)?????, ?????????latch/mutex??. ????shared pool?resize??????,??latch/mutex???????. ?????????:  ?????bug; ???????????,??resize???????????????,???????????. ??bug?fix??????????impact, ???????????. ???????: 1). ??buffer cache?shared pool??(???????????,?????????) 2). ??resize???????16?? alter system set "_memory_broker_stat_interval"=999; Disable AMM/ASMM?????????,?????: ??ora-4031????????????. 3. DDL?????????? ??????????????????. ???????????DDL (??grant, ?????, ????????),???????????SQL?????invalidate?;????????SQL????????????,?????????hard parse ? SQL??????. ??????? “hardparse storm”, latch/mutex????????, ??library cache lock/row cache lock????; ??????????slow/hung. ???????: ???????????DDL ??????????,???????????,?? “????????????3?????"?

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  • C# System.Data.SQLite Designer Code

    - by Nathan
    I've been messing around with the SQLite Designer in Visual Studio 2008 and I have noticed that when I use the generated Insert/Update statements they run extremely slow. Example: I have a data table with four columns and 5700 rows it took ~5 mins to insert the data into the database table However, I wrote my own database connection and insert methods using parameters and a single transaction and the same 5700 rows were inserted in under 1 second. Why is the generated code so slow and what is benefit to even using it? Thanks. Nathan

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  • Best DataMining Database

    - by Eric
    I am an ocasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small compamy and I have been started a new project where I think it is about time to try new databases. Sales departament makes a CSV dump every week and I need to make a small scripting application that allow people form other departaments mixing the information, mostly linking the records. I have all this solved, my problem is the speed, I am using just plain text files for all this and unsurprisingly it is very slow. I thought about using mysql, but then I need installing mysql in every desktop, sqlite is easier, but it is very slow. I do not need a full relational database, just some way of play with big amounts of data in a decent time. Many thanks!

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  • Transpose a file in bash

    - by Thrawn
    Hi all, I have a huge tab-separated file formatted like this X column1 column2 column3 row1 0 1 2 row2 3 4 5 row3 6 7 8 row4 9 10 11 I would like to transpose it in an efficient way using only using commands (I could write a ten or so lines Perl script to do that, but it should be slower to execute than the native bash functions). So the output should look like X row1 row2 row3 row4 column1 0 3 6 9 column2 1 4 7 10 column3 2 5 8 11 I thought of a solution like this cols=`head -n 1 input | wc -w` for (( i=1; i <= $cols; i++)) do cut -f $i input | tr $'\n' $'\t' | sed -e "s/\t$/\n/g" >> output done But it's slow and doesn't seem the most efficient solution. I've seen a solution for vi in this post, but it's still over-slow. Any thoughts/suggestions/brilliant ideas? :-)

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  • Delphi and prevent event handling

    - by pKarelian
    How do you prevent a new event handling to start when an event handling is already running? I press a button1 and event handler start e.g. slow printing job. There are several controls in form buttons, edits, combos and I want that a new event allowed only after running handler is finnished. I have used fRunning variable to lock handler in shared event handler. Is there more clever way to handle this? procedure TFormFoo.Button_Click(Sender: TObject); begin if not fRunning then try fRunning := true; if (Sender = Button1) then // Call something slow ... if (Sender = Button2) then // Call something ... if (Sender = Button3) then // Call something ... finally fRunning := false; end; end;

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  • Building a directory tree from a list of file paths

    - by Abignale
    I am looking for a time efficient method to parse a list of files into a tree. There can be hundreds of millions of file paths. The brute force solution would be to split each path on occurrence of a directory separator, and traverse the tree adding in directory and file entries by doing string comparisons but this would be exceptionally slow. The input data is usually sorted alphabetically, so the list would be something like: C:\Users\Aaron\AppData\Amarok\Afile C:\Users\Aaron\AppData\Amarok\Afile2 C:\Users\Aaron\AppData\Amarok\Afile3 C:\Users\Aaron\AppData\Blender\alibrary.dll C:\Users\Aaron\AppData\Blender\and_so_on.txt From this ordering my natural reaction is to partition the directory listings into groups... somehow... before doing the slow string comparisons. I'm really not sure. I would appreciate any ideas. Edit: It would be better if this tree were lazy loaded from the top down if possible.

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  • How to get span tag inside a div in jQuery and assign a text?

    - by bala3569
    I use the following , <div id='message' style="display: none;"> <span></span> <a href="#" class="close-notify">X</a> </div> Now i want to find the span inside the div and assign a text to it... function Errormessage(txt) { $("#message").fadeIn("slow"); // find the span inside the div and assign a text $("#message a.close-notify").click(function() { $("#message").fadeOut("slow"); }); }

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  • Handler invocation speed: Objective-C vs virtual functions

    - by Kerido
    I heard that calling a handler (delegate, etc.) in Objective-C can be even faster than calling a virtual function in C++. Is it really correct? If so, how can that be? AFAIK, virtual functions are not that slow to call. At least, this is my understanding of what happens when a virtual function is called: Compute the index of the function pointer location in vtbl. Obtain the pointer to vtbl. Dereference the pointer and obtain the beginning of the array of function pointers. Offset (in pointer scale) the beginning of the array with the index value obtained on step 1. Issue a call instruction. Unfortunately, I don't know Objective-C so it's hard for me to compare performance. But at least, the mechanism of a virtual function call doesn't look that slow, right? How can something other than static function call be faster?

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  • Why does this jquery slideToggle code not work?

    - by cbmeeks
    I am trying to alter the button text for a expand/collapse button. Basically, a user clicks "Collapse" and I perform a slideToggle and when the slideToggle is done, I change the button text to "Expand" and vice-versa. The following code works great however if you click the expand/collapse button rapidly, it looses its mind and shows "Expand" when it's already expanded or "Collapse" when it's already collapsed. Any tips are appreciated. Thanks! function toggleBox( button, box ){ if($(box).is(":hidden")) { $(box).slideToggle("slow", function(){ $(button).html("Collapse"); }); } else { $(box).slideToggle("slow", function(){ $(button).html("Expand"); }); } }

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  • Greenspun's 10th rule in Perl?

    - by DVK
    Greenspun's Tenth Rule of Programming is a common aphorism in computer programming and especially programming language circles. It states: Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp. The questions are, 1) Would you consider this to be true of Perl interpreter? Only objective arguments please (e.g. which features of Common Lisp are implemented within the interpreter) 2) Independently, does there exist a Lisp (or at least a n ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp) implemented entirely in Perl?

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  • Is Code Completion speed improved in Delphi 2010?

    - by Holgerwa
    I am working with Delphi 2009 Pro and just tried to find out why code completion is so slow in my setup. Whenever code completion is invoked, the IDE locks up for up to 30s, which really interrupts any workflow. When working with BDS 2006, code completion was incredibly fast compared to Delphi 2009. After reading this post it seems to be normal for Delphi 2009, but just turning off the automatic code completion is not anything I want to do. My question is: If I switch to Delphi 2010, will I have the same slow speed for code completion or was it improved to a point to be usable?

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  • jQuery Toggle with Cookie

    - by Cameron
    I have the following toggle system, but I want it to remember what was open/closed using the jQuery cookie plugin. So for example if I open a toggle and then navigate away from the page, when I come back it should be still open. This is code I have so far, but it's becoming rather confusing, some help would be much appreciated thanks. jQuery.cookie = function (name, value, options) { if (typeof value != 'undefined') { options = options || {}; if (value === null) { value = ''; options = $.extend({}, options); options.expires = -1; } var expires = ''; if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) { var date; if (typeof options.expires == 'number') { date = new Date(); date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000)); } else { date = options.expires; } expires = '; expires=' + date.toUTCString(); } var path = options.path ? '; path=' + (options.path) : ''; var domain = options.domain ? '; domain=' + (options.domain) : ''; var secure = options.secure ? '; secure' : ''; document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join(''); } else { var cookieValue = null; if (document.cookie && document.cookie != '') { var cookies = document.cookie.split(';'); for (var i = 0; i < cookies.length; i++) { var cookie = jQuery.trim(cookies[i]); if (cookie.substring(0, name.length + 1) == (name + '=')) { cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); break; } } } return cookieValue; } }; // var showTop = $.cookie('showTop'); if ($.cookie('showTop') == 'collapsed') { $(".toggle_container").hide(); $(".trigger").toggle(function () { $(this).addClass("active"); }, function () { $(this).removeClass("active"); }); $(".trigger").click(function () { $(this).next(".toggle_container").slideToggle("slow,"); }); } else { $(".toggle_container").show(); $(".trigger").toggle(function () { $(this).addClass("active"); }, function () { $(this).removeClass("active"); }); $(".trigger").click(function () { $(this).next(".toggle_container").slideToggle("slow,"); }); }; $(".trigger").click(function () { if ($(".toggle_container").is(":hidden")) { $(this).next(".toggle_container").slideToggle("slow,"); $.cookie('showTop', 'expanded'); } else { $(this).next(".toggle_container").slideToggle("slow,"); $.cookie('showTop', 'collapsed'); } return false; }); and this is a snippet of the HTML it works with: <li> <label for="small"><input type="checkbox" id="small" /> Small</label> <a class="trigger" href="#">Toggle</a> <div class="toggle_container"> <p class="funding"><strong>Funding</strong></p> <ul class="childs"> <li class="child"> <label for="fully-funded1"><input type="checkbox" id="fully-funded1" /> Fully Funded</label> <a class="trigger" href="#">Toggle</a> <div class="toggle_container"> <p class="days"><strong>Days</strong></p> <ul class="days clearfix"> <li><label for="1pre16">Pre 16</label> <input type="text" id="1pre16" /></li> <li><label for="2post16">Post 16</label> <input type="text" id="2post16" /></li> <li><label for="3teacher">Teacher</label> <input type="text" id="3teacher" /></li> </ul> </div> </li>

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  • After using modern languages, can C NOT be painful?

    - by Alexandre
    I started my computer engineering course recently and we've been using C for a couple of things. Before starting university, I was doing a lot of web development. I've written a lot of PHP code (yuck!) and for the last year or so Ruby exclusively. aside: I love Ruby, love it! So after a year of heavy Ruby development, is it wrong to think that C should be avoided at all costs unless absolutely necessary? Right now it seems to me I should try to a) get it to run in Ruby b) if it's too slow, try Java c) if it's too slow, use C Is there anyone who jumps straight to C if a VM (Ruby, Java, Python, etc) can be used on the machine and speed is not an issue? In other words, can C NOT be painful?

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  • MPI: is there mpi libraries capable of message compression?

    - by osgx
    Sometimes MPI is used to send low-entropy data in messages. So it can be useful to try to compress messages before sending it. I know that MPI can work on very fast networks (10 Gbit/s and more), but many MPI programs are used with cheap network like 0,1G or 1Gbit/s Ethernet and with cheap (slow, low bisection) network switch. There is a very fast Snappy (wikipedia) compression algorithm, which has Compression speed is 250 MB/s and decompression speed is 500 MB/s so on compressible data and slow network it will give some speedup. Is there any MPI library which can compress MPI messages (at layer of MPI; not the compression of ip packets like in PPP). MPI messages are also structured, so there can be some special method, like compression of exponent part in array of double.

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  • spring mvc vs seam

    - by darko petreski
    Hi, Spring mvc is a framework that has been long time out there, it is well documented and proven technology. A lot of web sites are using spring. Seam is a framework based on jsf - rich faces implementation. It has a lot of ajax based components. It uses some heavy stuff like EJB, JPA. All of this is prone to errors and this framework is so slow (at my computer it is almost impossible do develop something because it is really slow, especially redeploying on jboss) But is is very good for back office applications. Does someone have a professional experience with this two frameworks? Can you recommend the better one ? Why? Regards

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  • Problem with From field in contact form and mail() function

    - by Matthew
    I've got a contact form with 3 fields and a textarea... I use jQuery to validate it and then php to send emails. This contact form works fine but, when I receive an email, From field isn't correct. I'd like to want that From field shows text typed in the Name field of the contact form. Now I get a From field like this: <[email protected]> For example, if an user types "Matthew" in the name field, I'd like to want that this word "Matthew" appears in the From field. This is my code (XHTML, jQuery, PHP): <div id="contact"> <h3 id="formHeader">Send Us a Message!</h3> <form id="contactForm" method="post" action=""> <div id="risposta"></div> <!-- End Risposta Div --> <span>Name:</span> <input type="text" id="formName" value="" /><br /> <span>E-mail:</span> <input type="text" id="formEmail" value="" /><br /> <span>Subject:</span> <input type="text" id="formSubject" value="" /><br /> <span>Message:</span> <textarea id="formMessage" rows="9" cols="20"></textarea><br /> <input type="submit" id="formSend" value="Send" /> </form> </div> <script type="text/javascript"> $(document).ready(function(){ $("#formSend").click(function(){ var valid = ''; var nome = $("#formName").val(); var mail = $("#formEmail").val(); var oggetto = $("#formSubject").val(); var messaggio = $("#formMessage").val(); if (nome.length<1) { valid += '<span>Name field empty.</span><br />'; } if (!mail.match(/^([a-z0-9._-]+@[a-z0-9._-]+\.[a-z]{2,4}$)/i)) { valid += '<span>Email not valid or empty field.</span><br />'; } if (oggetto.length<1) { valid += '<span>Subject field empty.</span><br />'; } if (valid!='') { $("#risposta").fadeIn("slow"); $("#risposta").html("<span><b>Error:</b></span><br />"+valid); $("#risposta").css("background-color","#ffc0c0"); } else { var datastr ='nome=' + nome + '&mail=' + mail + '&oggetto=' + oggetto + '&messaggio=' + encodeURIComponent(messaggio); $("#risposta").css("display", "block"); $("#risposta").css("background-color","#FFFFA0"); $("#risposta").html("<span>Sending message...</span>"); $("#risposta").fadeIn("slow"); setTimeout("send('"+datastr+"')",2000); } return false; }); }); function send(datastr){ $.ajax({ type: "POST", url: "contactForm.php", data: datastr, cache: false, success: function(html) { $("#risposta").fadeIn("slow"); $("#risposta").html('<span>Message successfully sent.</span>'); $("#risposta").css("background-color","#e1ffc0"); setTimeout('$("#risposta").fadeOut("slow")',2000); } }); } </script> <?php $mail = $_POST['mail']; $nome = $_POST['nome']; $oggetto = $_POST['oggetto']; $text = $_POST['messaggio']; $ip = $_SERVER['REMOTE_ADDR']; $to = "[email protected]"; $message = $text."<br /><br />IP: ".$ip."<br />"; $headers = "From: $nome \n"; $headers .= "Reply-To: $mail \n"; $headers .= "MIME-Version: 1.0 \n"; $headers .= "Content-Type: text/html; charset=UTF-8 \n"; mail($to, $oggetto, $message, $headers); ?>

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  • how to properly use jquery .stop() ?

    - by GaVrA
    Hello! On this page: http://www.arvag.net/old/smsbox.de/ when you hover over "Informationen" and "Über uns" you get sub menu shown. When you move mouse away it hides. Normally i have problem with jquery making queue for every single hover i make, and then i just keeps on animating all those hovers. I tried to implement stop() but just cant get it to work properly. This is the code i am using: <script type="text/javascript"> //<![CDATA[ $(function(){ $('#nav_menu > .center > ul > li').hover(function() { $(this).children('ul').slideToggle('slow'); },function(){ $(this).stop(true,true).children('ul').slideToggle('slow'); }).click(function(){ return false; }); }); //]]> </script> Thanks!

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  • JQuery toggle problem

    - by Mazhar Ahmed
    I'm using JQuery. I'm writing this as HTML code: <li id="toggle"> <a id="open" class="open" href="#">Log In | Register</a> <a id="close" class="close" style="display: none;" href="#">Close Panel</a> </li> and I'm writing a code like that: $(document).ready(function() { // Expand Panel $("#open").click(function(){ $("div#panel").slideDown("slow"); }); // Collapse Panel $("#close").click(function(){ $("div#panel").slideUp("slow"); }); // Switch buttons from "Log In | Register" to "Close Panel" on click $("#toggle a").click(function () { $("#toggle a").toggle(); }); }); They problem is that, it's working in a file. And after that I copied in in another file and it will not working. There is no duplicate ID or anything else in the document

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  • JavaScript accordion effect won't work, something to do with pseudoclass?

    - by Dennis Hodapp
    I tried to make an accordion effect with JavaScript based off this video altering a few things like using an input button instead of a link for the selector. However for some reason it's not working. Firefox error console outputs unkown pseudo-class or pseudo-element "visible" everytime I try to use it. What's the problem? $("div.example").hide(); $("input.exampleButton").click(function(){ $("div.example:visible").slideUp("slow"); $(this).parent().next().slideDown("slow"); //return false; if you don't want the link to follow }); Here is the HTML input type="button" value="See An Example" class="exampleButton" /> <div class="example"> ...content </div> input type="button" value="See An Example" class="exampleButton" /> <div class="example"> ...content </div>

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  • May the FileInputStream.available foolish me?

    - by Tom Brito
    This FileInputStream.available() javadoc says: Returns an estimate of the number of remaining bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes. In some cases, a non-blocking read (or skip) may appear to be blocked when it is merely slow, for example when reading large files over slow networks. I'm not sure if in this check: if (new FileInputStream(xmlFile).available() == 0) can I rely that empty files will always return zero?

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  • a loading screen for a c# wpf listbox

    - by evan
    I'm using a list box where there are on average about 500 thumbnails (items) that can be sorted and searched. Since I'm using default databinding and search descriptors (which I've heard are slow due to reflection) the list takes a noticeable pause of a few seconds loading, sorting, and searching (the list dynamically updates based on the contents of the search box so the first one or two letters typed are really slow). I don't think I can fully do away with reflection give the timeframe for the project, and speed isn't super essential, but I'd like some kind of graphical indication of the delay so it doesn't confuse the user. How could I do something like a website video loading screen where the listbox grays out and some kind of loading circle indicates it's processing until the list is ready? Or even just grayed out with the words "Loading..." for a few seconds could work. Any ideas? Thanks in advance for your help and suggestions!!!

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  • Dynamic Jquery Accordion

    - by kwek-kwek
    How do I default an accordion to be closed on start-up. here is the sample view here Here is the code: <script> $(function() { $("#accordion").tabs("#accordion div.pane", {tabs: 'h3', effect: 'slide'}); }); </script> <script> // add new effect to the tabs $.tools.tabs.addEffect("slide", function(i, done) { // 1. upon hiding, the active pane has a ruby background color this.getPanes().slideUp("slow").css({backgroundColor: "#fff"}); // 2. after a pane is revealed, its background is set to its original color (transparent) this.getPanes().eq(i).slideDown("slow", function() { $(this).css({backgroundColor: 'transparent'}); // the supplied callback must be called after the effect has finished its job done.call(); }); }); </script>

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