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  • Avoiding explicit recursion in Haskell

    - by Travis Brown
    The following simple function applies a given monadic function iteratively until it hits a Nothing, at which point it returns the last non-Nothing value. It does what I need, and I understand how it works. lastJustM :: (Monad m) => (a -> m (Maybe a)) -> a -> m a lastJustM g x = g x >>= maybe (return x) (lastJustM g) As part of my self-education in Haskell I'm trying to avoid explicit recursion (or at least understand how to) whenever I can. It seems like there should be a simple non-explicitly recursive solution in this case, but I'm having trouble figuring it out. I don't want something like a monadic version of takeWhile, since it could be expensive to collect all the pre-Nothing values, and I don't care about them anyway. I checked Hoogle for the signature and nothing shows up. The m (Maybe a) bit makes me think a monad transformer might be useful here, but I don't really have the intuitions I'd need to come up with the details (yet). It's probably either embarrassingly easy to do this or embarrassingly easy to see why it can't or shouldn't be done, but this wouldn't be the first time I've used self-embarrassment as a pedagogical strategy. Background: Here's a simplified working example for context: suppose we're interested in random walks in the unit square, but we only care about points of exit. We have the following step function: randomStep :: (Floating a, Ord a, Random a) => a -> (a, a) -> State StdGen (Maybe (a, a)) randomStep s (x, y) = do (a, gen') <- randomR (0, 2 * pi) <$> get put gen' let (x', y') = (x + s * cos a, y + s * sin a) if x' < 0 || x' > 1 || y' < 0 || y' > 1 then return Nothing else return $ Just (x', y') Something like evalState (lastJustM (randomStep 0.01) (0.5, 0.5)) <$> newStdGen will give us a new data point.

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  • How does an NTP host switch among the various modes?

    - by James A. Rosen
    The NTPv3 RFC describes five operating modes: Symmetric Active (1): A host operating in this mode sends periodic messages regardless of the reachability state or stratum of its peer. By operating in this mode the host announces its willingness to synchronize and be synchronized by the peer. Symmetric Passive (2): This type of association is ordinarily created upon arrival of a message from a peer operating in the symmetric active mode and persists only as long as the peer is reachable and operating at a stratum level less than or equal to the host; otherwise, the association is dissolved. However, the association will always persist until at least one message has been sent in reply. By operating in this mode the host announces its willingness to synchronize and be synchronized by the peer. Client (3): A host operating in this mode sends periodic messages regardless of the reachability state or stratum of its peer. By operating in this mode the host, usually a LAN workstation, announces its willingness to be synchronized by, but not to synchronize the peer. Server (4): This type of association is ordinarily created upon arrival of a client request message and exists only in order to reply to that request, after which the association is dissolved. By operating in this mode the host, usually a LAN time server, announces its willingness to synchronize, but not to be synchronized by the peer. Broadcast (5): A host operating in this mode sends periodic messages regardless of the reachability state or stratum of the peers. By operating in this mode the host, usually a LAN time server operating on a high-speed broadcast medium, announces its willingness to synchronize all of the peers, but not to be synchronized by any of them. It seems to me, though, that any host except a leaf node would probably be in several modes. For example, I might have a local area network with three NTP servers, each in Symmetric Active (1) mode with respect to one another. They would also each be clients (3) of one of the many public stratum two time servers. Lastly, they would all server as servers (4) to the many local clients. Is the point that they're only in a given mode for a moment during the synchronization? If so, how does a host know to switch? I'm only looking for enough depth here to discuss the issue in an educated manner, not to write a custom time server.

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  • Make website reachable through domain?

    - by Msmit1993
    I'm learning to use IIS 7 but I don't understand how I can make my website available through a domain. I have a domain as example I will call it www.test.com I have made a website in IIS, running on port 80 and can be viewed by typing the IP of the server in the address bar of my browser. So if I type www.test.com in the address bar how do I make my IIS website show up, without a redirect of course, I don't want users to see the IP in the address bar.

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  • Text to speech during IPhone call

    - by Jonathan
    Is there way to be able to type instead of speak during an iPhone call. For example when you text a landline (in the uk at least) the text message will be converted to speech. I would like to be able to do a similar thing in real time on my iPhone to another mobile. For example it would be useful for a mute person who can not speak to be able to "participate" in phone calls.

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  • solr Security help

    - by Camran
    I have solr setup with Jetty on my Ubuntu server. On any computer now, I can type my_ip:8983/solr/ and the page will show upp to anybody. How can I disable this so that only I can access that port and the solr admin? Thanks

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  • apache automatically completes url

    - by John
    See this NYTimes url: http://opinionator.blogs.nytimes.com/2011/01/02/war-in-the-cabinet/?hp If we type opinionator.blogs.nytimes.com/2011/01/02/war-i in browser, it automatically redirects us to the above article, the only article in that folder starting with "war-i". How to do this in a site with apache, which serves static html files only? That is, if there is a apache module, without adding scripts, that would be best.

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  • how to validate the form using jquery

    - by kumar
    I have this Fieldset values.. <fieldset class="clearfix" id="fieldset-exception"> <legend>Mass Edit Exception Information</legend> <div id="#error-msg-ID" class="ui-widget hide"> <div class="ui-state-highlight ui-corner-all"> <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-info"></span> <span></span></p> </div> </div> <div class="fiveper"> <label for="ExceptionStatus"> Status: <span> </span> </label> <label for="ResolutionCode"> Resolution: <span> <%=Html.DropDownListFor(model => model.Exception.ResolutionCode, new SelectList(Model.LookupCodes["C_EXCPT_RESL"], "Key", "Value"))%> </span> </label> <label for="ReasonCode"> Reason: <span><%=Html.DropDownListFor(model => model.Exception.ReasonCode, new SelectList(Model.LookupCodes["C_EXCPT_RSN"], "Key", "Value"))%></span> </label> <label for="ExceptionStatus"> Action Taken: <span><%=Html.DropDownListFor(model => model.Exception.ActionCode, new SelectList(Model.LookupCodes["C_EXCPT_ACT"], "Key", "Value"))%></span> </label> </div> <div class="fiveper"> <label for="FollowupDate"> Follow-up: <span><input type="text" id="exc-flwup" name="fdate" /></span> <%--<%=Html.EditorFor(model=>model.Exception.FollowupDate) %>--%> </label> <label for="IOL"> Inquiry #: <%=Html.TextBox("Inquiry", ViewData["inq"] ?? "")%> </label> <label>Comment</label> <span> <%=Html.TextArea("value", ViewData["Comnt"] ?? "")%> <%=Html.ValidationMessage("value")%> </span> </div> <br /> <br /> <div> <input type="submit" class="button" value="Save" /> </div> </fieldset> before submiting I need to do some time of validation..below validation not working for me is that right what I am doing here? These all fieds user is entering from UI.. thanks <script type="text/javascript"> $(document).ready(function() { $('#btnSelectAll').click(function() { $('#EditExceptions input[name=chk]').attr('checked', true); }); $('#btnCancel').click(function() { $('#EditExceptions input[name=chk]').attr('checked',false); }); function validate_excpt(formData, jqForm, options) { var form = jqForm[0]; **if (form.e_Exception_ResolutionCode.value && !form.e_Exception_ReasonCode.value) { alert('All Resolution Codes need a Reason Code.'); return false; }** } // post-submit callback function showResponse(responseText, statusText, xhr, $form) { if (responseText[0].substring(0, 16) != "System.Exception") { $('#error-msg-ID span:last').html('<strong>Update successful.</strong>'); $().ShowDialog('Success', 'Update successful'); } else { $('#error-msg-ID span:last').html('<strong>Update failed.</strong> ' + responseText[0].substring(0, 48)); $().ShowDialog('Failed', 'Update failed'); } $('#error-msg-ID').removeClass('hide'); $('#gui-stat-').html(responseText[1]); } $('#exc-').ajaxForm({ beforeSubmit: validate_excpt, success: showResponse, dataType: 'json' }); $('.button').button(); $("input[id^='exc-flwup']").datepicker({ duration: '', showTime: true, constrainInput: true, stepMinutes: 30, stepHours: 1, altTimeField: '', time24h: true, minDate: 0 }); $('#ui-timepicker-div').bgiframe(); }); </script>

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  • How do I find out what connection my laptop HDD uses?

    - by rutherford
    My laptop is about 6 years old and the HDD's about to give way so I thought I'd get a new one and copy an image over. How do I find out what type of connection my laptop uses? Eg is it SATA or whatever? Might be a bone question but I'm not really aware of the different types and if they've changed much in the past 6 years. Do I need to think about this or is it not an issue?

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  • Windows 8 login with Live ID without local account

    - by Skintkingle
    We have just got Windows 8 Release Preview installed in our offices. We wanted to open it up for viewing to the public and I'd like to know if there is a way to let people log in with their Windows Live ID without having to set up a user account for them beforehand? What we are after is a user being able to walk up to the PC, type in their Windows Live ID and password, and they're logged in as a default user. Is this doable in Windows 8, and if so, how?

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  • Local Only 3G Router via Broadband Device?

    - by GateKiller
    I am looking for the name/type of device which does the following: Connects to the internet via ethernet or wireless and then produces a "fake" 3G signal for my iPhone to connect to. The 3G siginal in my office is very weak or non-existant and I need a way of boosting or replacing it.

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  • Rename X11 input devices with hotplugging?

    - by buergi
    Is it possible to change the X11 input device identifiers, as they are for example listed by xinput? Preferably without switching to a static xorg.conf configuration, I'm using xorg-server 1.12.4 (archlinux). I need to do that since, as it seems Blender identifies the Pen and Eraser of a graphics tablet using the hardcoded names "stylus" and "eraser" but by default the names of my tablet are prefixed with the type e.g. "Wacom Bamboo 16FG 4x5 Pen stylus".

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  • Alternative to VLC player [closed]

    - by Shimmy
    I've been using VLC player but since the latest version (2.0.1) it's rendering all the Hebrew subtitles as question marks. I'm looking for a good free alternative that runs on Windows OS. I prefer a player with a huge dashboard and zillion preferences where all the possible options are customizable. Once ago I used MV2 player and loved that type of player that supports all the possible tweaks etc. etc.

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  • lack of update in xen kernel has any relation to guest operating systems?

    - by austin powers
    Hi , due to these two problems I've coped http://serverfault.com/questions/133578/not-able-to-install-g-and-gcc-on-debian also there is another link but due to my low reputation I couldn't put it through. I just wondering whether the hosted operating system (XEN) has any relation to its guest operating system or not? and when I type uname -r on my VPS it shows : 2.6.18-164.9.1.el5xen where as my installed O/S on my vps is debian 5.04 regards.

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  • Possible to bypass laptop inverter power source - HP dv5000 inverter 7 input pins?

    - by Glen Tankersley
    I've got an HP dv5000 laptop with a backlight that won't light up, (but is known to be good). I've also got an inverter board which is good, but isn't getting power from the mobo. So, my question is, would it be possible to bypass the original power source, and hack together some type of externally powered input just for the backlight? If so, does anybody know the input voltage and meaning for the 7 input pins for the inverter board, or how to find out?

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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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  • Installing mysql-server with python ssh connection

    - by mrbox
    I'm writing a script in Python, which is connecting to server via ssh, then installing some packages. But there is problem with dialogue box, where i can type in a root password- i don't know how to send data there. Once I tried to do this, my apt(using Debian Lenny) gone crazy. Here is some info: - Debian Lenny - Using PySSH with easier interface, code looks like this: clientSSH = SSHClient( self.ip, 'root', self.rootPassword, None ) clientSSH.login() clientSSH.run_command('apt-get install mysql-server mysql-client php5') clientSSH.run_command('Y') #I Don't know how send root passwd here clientSSH.logout()

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  • Reversing a mod_rewrite rule

    - by KIRA
    I want to redirect accesses from http://www.domain.com/test.php?sub=subdomain&type=cars to http://subdomain.domain.com/cars I already have mod_rewrite rules to do the opposite: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{HTTP_HOST} !^(www)\. [NC] RewriteCond %{HTTP_HOST} ^(.*)\.(.*)\.com [NC] RewriteRule (.*) http://www.%2.com/index.php?route=$1&name=%1 [R=301,L] What changes do I need to make to these rules to redirect requests from the script to the subdomain?

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  • Virtual Box, full screen ?

    - by Arkapravo
    Hi How can I get Virtual Box go full screen, as of now I am getting my guest OS in a small screen (640 x 480) type, even 'going full screen' doesn't make any difference ? I want my guest OS to be of same screen size as my host OS ! Regards

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  • Configuring EC2 Instance

    - by Philip Isaacs
    Forgive me if this seems like a dumb question, but I'm wondering how do I increase the processing power (cpu, memory) of an instance I already have running. Right now I have a web server running on a m1.small type instance and it's performing poorly at peak times, is it possible to increase the amount of memory on the instance somehow, or do I need to create a new EC2 install. What are my options. Please advise.

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