Search Results

Search found 6591 results on 264 pages for 'rules engines'.

Page 193/264 | < Previous Page | 189 190 191 192 193 194 195 196 197 198 199 200  | Next Page >

  • What, if any, is wrong with this definition of letrec in Scheme?

    - by Lajla
    R5RS gives proposed macro definitions for library forms of syntax: http://schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-10.html#%_sec_7.3 Which also defines letrec, in a very complicated way, certainly not how I would define it, I would simply use: (define-syntax letrec2 (syntax-rules () ((letrec2 ((name val) ...) body bodies ...) ((lambda () (define name val) ... body bodies ...))))) As far as I understand the semantics of letrec, which I use very often as a named let. It works in this way, however as I've had my fair share of debates with philosophers who think they can just disprove special relativity or established phonological theories, I know that when you think you have a simple solution to a complex problem, it's probably WRONG. There has got to be some point where this macro does not satify the semantics of letrec else they'd probably have used it. In this definition, the definitions are local to the body of the letrec, they can refer to each other for mutual recursion, I'm not quite sure what (if any) is wrong.

    Read the article

  • Qt4.6: QTextDocument <HR> tag prints only very thin, almost invisible hair lines

    - by hurikhan77
    When printing a QTextDocument with doc->print() I almost cannot see the horizontal rules inserted by <hr>. When printing to PDF these are clearly visible. But when printed to a printer these lines are very very thin lines, almost invisible on the paper. How do I fix this? I currently helped myself by inserting an <img> with a black pixel but this is very cumbersome as I have to exactly figure out the proper pixel width by trial and error.

    Read the article

  • "Out of Memory" error in Lotus Notes automation from VBA

    - by PowerUser
    This VBA function sporadically fails with a Notes automation error "Run-Time Error '7' Out of Memory". Naturally, when I try to manually reproduce it, everything runs fine. Function ToGMT(ByVal X As Date) As Date Static NtSession As NotesSession If NtSession Is Nothing Then Set NtSession = New NotesSession NtSession.Initialize End If (do stuff) End function To put this in context, this VBA function is being called by an Access query, 3-4 times per record, with 20,000 records. For performance reasons, the NotesSession has been made static. Any ideas why it is sporadically giving an out-of-memory error? (Also, I'm initiating the NotesSession just so I can convert a datetime to GMT using Lotus's rules. If you know a better way, I'm listening).

    Read the article

  • how is this jquery app validating the username? (3rd party script)

    - by SarmenHB
    The tutorial that I'm trying to figure out is this: http://www.position-absolute.com/articles/jquery-form-validator-because-form-validation-is-a-mess/ The username field looks like this: <input value="" class="validate[required,custom[noSpecialCaracters],length[0,20],ajax[ajaxUser]]" type="text" name="user" id="user" /> That <input> field has a class item named ajax[ajaxUser] which has its rules contained in this script (jquery.validationEngine-en.js). The snippet for that item looks like this: "ajaxUser":{ "file":"validateUser.php", "extraData":"name=eric", "alertTextOk":"* This user is available", "alertTextLoad":"* Loading, please wait", "alertText":"* This user is already taken"}, What I can't figure out at all is how its PHP page is working which is validateUser.php. Where are all those post fields coming from? I looked around and can't find a field with those names. Thanks

    Read the article

  • how to use expressons as function parameters in powershell

    - by rmeador
    This is a very simple task in every language I have ever used, but I can't seem to figure it out in PowerShell. An example of what I'm talking about in C: abs(x + y) The expression x + y is evaluated, and the result passed to abs as the parameter... how do I do that in PowerShell? The only way I have figured out so far is to create a temporary variable to store the result of the expression, and pass that. PowerShell seems to have very strange grammar and parsing rules that are constantly catching me by surprise, just like this situation. Does anyone know of documentation or a tutorial that explains the basic underlying theory of the language? I can't believe these are all special cases, there must be some rhyme or reason that no tutorial I have yet read explains. And yes, I've read this question, and all of those tutorials are awful. I've pretty much been relegated to learning from existing code.

    Read the article

  • Modules and custom routes

    - by Dennis Haarbrink
    I'm building a website using Zend Framework and having trouble implementing modules and custom routes. There are basically two rules: Select a module based on the domain (multiple domains can select a single module) Regardless of domain, select one specific module based on path Examples: domain1.com selects module domain1 domain1.net selects module domain1 domain2.com selects module domain2 both domain1.com/admin and domain2.com/admin select module admin This is the first project where I use ZF, so my experience with the framework is basically non-existent. I have done some dirty hacking in my bootstrapper where I check the domain and than execute Zend_Layout::startMVC() to get the correct layout, but that is messed up when I'm implementing custom routes. So I was wondering what is the best way to go about implementing this?

    Read the article

  • jQuery validation plugin doens't work for me

    - by Idsa
    I have the following code to enable validation work: $(document).ready(function() { $("#eventForm").validate({ rules: { startDate: "required", startTime: "required", endDate: { required: function (element) { var endTimeValue = $('#endTime').val(); return (endTimeValue != null && endTimeValue != ''); } }, endTime: { required: function (element) { var endDateValue = $('#endDate').val(); return (endDateValue != null && endDateValue != ''); } } }, messages: { startDate: "Please enter event local start date", startTime: "Please enter event local start time" }, errorPlacement: function (error, element) { error.appendTo(element.parent().next()); }, submitHandler: function (form) { var options = { dataType: 'json', success: eventCreationSuccess, error: eventCreationError }; alert('submit'); //$(form).ajaxSubmit(options); } }); }); But validation plugin doesn't catch submit - default submit is executed. jQuery and validation plugin scripts are imported.

    Read the article

  • @media queries - one rule overrides another?

    - by John
    I have multiple @media queries all working fine but as soon as i put in a higher max screen-width than 1024px the rules for the higher width gets applied to everything. @media screen and (max-width: 1400px) { #wrap { width: 72%; } } @media screen and (max-width: 1024px) { #slider h2 { width: 100%; } #slider img { margin: 60px 0.83333333333333% 0 2.08333333333333%; } .recent { width: 45.82%; margin: 10px 2.08333333333334% 0 1.875%; } } as you can see 1024px (and also the 800px max-width query) do not change the #wrap width and work fine. As soon as i add the 1400px max-width query it changes them to 72% for ALL sizes and does the same for any element - for instance if i set #slider img to have a margin of 40px it will show at ALL sizes even though it is only in the max-width of 1400px. Am i missing something really obvious? Been trying to work this out for the past 2 days! Thanks, John

    Read the article

  • Swap bits in c++ for a double

    - by hidayat
    Im trying to change from big endian to little endian on a double. One way to go is to use double val, tmp = 5.55; ((unsigned int *)&val)[0] = ntohl(((unsigned int *)&tmp)[1]); ((unsigned int *)&val)[1] = ntohl(((unsigned int *)&tmp)[0]); But then I get a warning: "dereferencing type-punned pointer will break strict-aliasing rules" and I dont want to turn this warning off. Another way to go is: #define ntohll(x) ( ( (uint64_t)(ntohl( (uint32_t)((x << 32) >> 32) )) << 32) | ntohl( ((uint32_t)(x >> 32)) ) ) val = (double)bswap_64(unsigned long long(tmp)); //or val = (double)ntohll(unsigned long long(tmp)); But then a lose the decimals. Anyone know a good way to swap the bits on a double without using a for loop?

    Read the article

  • Customising Symfony Admin Generator Form

    - by Rich
    Hi, I've generated the backend of my application, and am now just 'jazzing' the forms up (adding correct labels, validation rules etc). One thing I'd like to do is add a map (Google) which updates the marker as an address is entered into the form, then allows the user to drag it to correct the lat/lng should it be a little off. My question is, how can I customise the output of the form - I've read the docs (1.0,1.1,1.2 also) and it all seems very confusing. Customising forms not generated with the admin generator I know how to do using renderRow(); etc; but finding a way to add a little bit of HTML to the forms is making my eyes hurt! There's so much out of date stuff on the web regarding Symfony it's hard to know what to trust! If anyone can point me in the right direction that'd be great. Best Regards, Rich

    Read the article

  • Is there a Java equivalent for Ruby on Rails "url_for"?

    - by Oren Ben-Kiki
    I have written something like this pretty easily in C# (string GetUrl(new { controller = "foo", action = "bar", baz = "fnord" }), based on the existing capabilities of the XmlRouteCollection class provided by the ASP.NET MVC framework (why it isn't there out of the box is beyond me; the additional required code was trivial). I am now faced with a JSP project, and I need the same ability: centralize the logic for generating all URLs in one place, based on a list of routing rules. Is there some code somewhere I could reuse/adapt to do this in Java? It seems like a common enough requirement, but google proved surprisingly unhelpful in finding something like this.

    Read the article

  • Insert dependencies dynamically in View (Javascript and CSS Files)

    - by Ph.E
    Friends, I am willing to follow the rules of the W3C where it is recommended that javascript and CSS files should be in individual files and not within the page. Good, following this rule, and not wanting to overload the master page, I would like to embed the dependencies dynamically. So how could I insert the libraries dynamically? I think the bigger problem is the Ajax requests. Example: <script type="text/javascript" src="http://sstatic.net/so/js/master.js?v=6523"></script> I tried using the JavascriptResult, but he writes the content on the page, and do not run as "Stream." Any help is welcome. Thanks

    Read the article

  • Subtracting Delphi Time Ranges from a Date Range, Calculate Remaining Time

    - by Anagoge
    I'm looking for an algorithm that will help calculate a workday working time length. It would have an input date range and then allow subtracting partially or completely intersecting time range slices from that date range and the result would be the number of minutes (or the fraction/multiple of a day) left in the original date range, after subtracting out the various non-working time slices. For Example: Input date range: 1/4/2010 11:21 am - 1/5/2010 3:00 pm Subtract out any partially or completely intersecting slices like this: Remove all day Sunday Non-Sundays remove 11:00 - 12:00 Non-Sundays remove time after 5:00 pm Non-Sundays remove time before 8:00 am Non-Sundays remove time 9:15 - 9:30 am Output: # of minutes left in the input date range I don't need anything overly-general. I could hardcode the rules to simplify the code. If anyone knows of sample code or a library/function somewhere, or has some pseudo-code ideas, I'd love something to start with. I didn't see anything in DateUtils, for example. Even a basic function that calculates the number of minutes of overlap in two date ranges to subtract out would be a good start.

    Read the article

  • Cannot resolve view when view is in subdirectory

    - by devzero
    We have a MVC 2.0 / c# 4.0 application that we develop visual studio. We have a part of the site (admin) that we have put in it's own sub directory and with its own routing rules: routes.Add("DomainRoute", new DomainRoute( ConfigurationManager.AppSettings["adminDomain"], // Domain with parameters "{controller}/{action}/{id}", // URL with parameters new { controller = "AdminPage", action = "Admin", id = "", isAdmin = true } We have all the views for the admin site inside an admin sub folder so that you get paths like: \views\admin\auth\login.aspx In the \controllers\admin\authController.aspx file I have a function called login: public ActionResult Login() { return View(); } This works just as it should, ie if i go admin.localhost\auth\login I go to the login page. But if I do a right click in visual studio and "go to view" i get an error "unable to go to matching view". Is there anyway to solve this?

    Read the article

  • jQuery Validation plugin: prompt for override

    - by Sam Carleton
    I have a jQuery form that has validation of a sort. It is a data entry screen with two 'recommend ranges', one is 36-84, the other 50-300. The business rules call for the values to be either blank or greater than zero, but to prompt for confirmation if the values are outside of the range listed above. I have seen some other threads that talk about setting the class="cancel" on the submit button. From what I can tell, this will simply disable the validation. I need to prompt for a "do you want to continue, yes or no?" and if no stop the submit, if yes, continue. Below is an example from the book Pro jQuery. By default the top row needs to be between 10 and 20 to submit. How would you change it so that it prompts you and if you say Yes it submits, no prevents the submit: <!DOCTYPE html> <html> <head> <title>Example</title> <script src="jquery-1.7.js" type="text/javascript"></script> <script src="jquery.tmpl.js" type="text/javascript"></script> <script src="jquery.validate.js" type="text/javascript"></script> <style type="text/css"> h1 { min-width: 70px; border: thick double black; margin-left: auto; margin-right: auto; text-align: center; font-size: x-large; padding: .5em; color: darkgreen; background-image: url("border.png"); background-size: contain; margin-top: 0; } .dtable {display: table;} .drow {display: table-row;} .dcell {display: table-cell; padding: 10px;} .dcell > * {vertical-align: middle} input {width: 2em; text-align: right; border: thin solid black; padding: 2px;} label {width: 5em; padding-left: .5em; display: inline-block;} #buttonDiv {text-align: center;} #oblock {display: block; margin-left: auto; margin-right: auto; min-width: 700px; } div.errorMsg {color: red} .invalidElem {border: medium solid red} </style> <script type="text/javascript"> $(document).ready(function() { var data = [ { name: "Astor", product: "astor", stocklevel: "10", price: "2.99"}, { name: "Daffodil", product: "daffodil", stocklevel: "12", price: "1.99"}, { name: "Rose", product: "rose", stocklevel: "2", price: "4.99"}, { name: "Peony", product: "peony", stocklevel: "0", price: "1.50"}, { name: "Primula", product: "primula", stocklevel: "1", price: "3.12"}, { name: "Snowdrop", product: "snowdrop", stocklevel: "15", price: "0.99"}, ]; var templResult = $('#flowerTmpl').tmpl(data); templResult.slice(0, 3).appendTo('#row1'); templResult.slice(3).appendTo("#row2"); $('form').validate({ highlight: function(element, errorClass) { $(element).add($(element).parent()).addClass("invalidElem"); }, unhighlight: function(element, errorClass) { $(element).add($(element).parent()).removeClass("invalidElem"); }, errorElement: "div", errorClass: "errorMsg" }); $.validator.addClassRules({ flowerValidation: { required: true, min: 0, max: 100, digits: true, } }) $('#row1 input').each(function(index, elem) { $(elem).rules("add", { min: 10, max: 20 }) }); $('input').addClass("flowerValidation").change(function(e) { $('form').validate().element($(e.target)); }); }); </script> <script id="flowerTmpl" type="text/x-jquery-tmpl"> <div class="dcell"> <img src="${product}.png"/> <label for="${product}">${name}: </label> <input name="${product}" value="0" required /> </div> </script> </head> <body> <h1>Jacqui's Flower Shop</h1> <form method="post" action="http://node.jacquisflowershop.com/order"> <div id="oblock"> <div class="dtable"> <div id="row1" class="drow"> </div> <div id="row2"class="drow"> </div> </div> </div> <div id="buttonDiv"><button type="submit">Place Order</button></div> </form> </body> </html>

    Read the article

  • popup panel that docks to the bottom of the screen

    - by Michael Wiles
    How do I create a pop panel that docks to the bottom of the screen... The way that I'm doing this is by setting the styling as such: bottom: 10px; position: absolute; This will always set the panel to 10 px from the bottom of the browser window. The problem is that gwt (or gwtp for that matter) is insisting on setting the right and the top of the panel and thus overriding my styling. If I use chrome's element explorer and disable the right and top style rules I get the correct behaviour so one way of doing it is somehow disabling gwt setting of the location of the panel on the screen...?

    Read the article

  • How do I use dependencies in a makefile without calling a target?

    - by rassie
    I'm using makefiles to convert an internal file format to an XML file which is sent to other colleagues. They would make changes to the XML file and send it back to us (Don't ask, this needs to be this way ;)). I'd like to use my makefile to update the internal files when this XML changes. So I have these rules: %.internal: $(DATAFILES) # Read changes from XML if any # Create internal representation here %.xml: %.internal # Convert to XML here Now the XML could change because of the workflow described above. But since no data files have changed, make would tell me that file.internal is up-to-date. I would like to avoid making %.internal target phony and a circular dependency on %.xml obviously doesn't work. Any other way I could force make to check for changes in the XML file and re-build %.internal?

    Read the article

  • sort array with special characters in php

    - by Enkay
    I have an array I'm trying to asort using php. The problem is that the array has accented characters in it and needs to be sorted using "french" rules. cote < côte < coté < côté I've tried many things, like using php collators, but I get the following error : PHP Fatal error: Class 'Collator' not found I've also tried to set locale but it didn't do anything so I'm not sure I was doing it right, or if I need to isntall the locale. I'm a little confused. I'm using PHP 5.2.4 if that helps. If I use asort without anything, it puts all the words with accented characters at the end. Thanks.

    Read the article

  • Wordpress & Django -- One domain, two servers. Possible?

    - by DomoDomo
    My question is about hosting Django and Wordpress under one domain, but two physical machines (actually, they are VMs but same diff). Let's say I have a Django webapp at example.com. I'd like to start a Wordpress blog about my webapp, so any blog page rank mojo flows back to my webapp, I'd like the blog address t be example.com/blog. My understanding is blog.example.com would not transfer said page rank mojo. Because I'm worried about Wordpress security flaws compromising my Django webapp, I want to host Django and Wordpress on two physically separate machines. Given all that, is it possible using re-write rules or a reverse proxy server to do this? I know the easy way is to make my Wordpress blog a subdomain, but I really don't want to do that. Has anyone done this in the past, is it stable? If I need a third server to be a dedicated reverse proxy, that's totally fine. Thanks!

    Read the article

  • The shortest way to convert infix expressions to postfix (RPN) in C

    - by kuszi
    Original formulation is given here (you can try also your program for correctness) . Additional rules: 1. The program should read from standard input and write do standard output. 2. The program should return zero to the calling system/program. 3. The program should compile and run with gcc -O2 -lm -s -fomit-frame-pointer. The challenge has some history: the call for short implementations has been announced at the Polish programming contest blog in September 2009. After the contest, the shortest code was 81 chars long. Later on the second call has been made for even shorter code and after the year matix2267 published his solution in 78 bytes: main(c){read(0,&c,1)?c-41&&main(c-40&&(c%96<27||main(c),putchar(c))):exit(0);} Anyone to make it even shorter or prove this is impossible?

    Read the article

  • Hide partial background repeat

    - by ComFreek
    Consider these simple CSS rules: jsFiddle div#container { width: 50%; height: 260px; background-image: url('Image.png'); background-repeat: repeat-x; }? The problem is that I only want full images. If there is not enough space for another duplicate, it should NOT be shown. I've never heard that CSS provides a rule for it. So how can I achieve it in JavaScript (jQuery already included)?

    Read the article

  • extra AuthorizationRule in web.config AuthorizationSection

    - by H07R0D
    I'm trying to modify the list of allowed users in web.config from a codebehind. <authorization> <allow users="alice, bob"/> <deny users="*"/> </authorization> I successfully retrieve the section I need config = WebConfigurationManager.OpenWebConfiguration("~"); authSection = (AuthorizationSection)config.GetSection("system.web/authorization"); When I iterate looking for the allow rule, I get two of them. foreach (AuthorizationRule rule in authSection.Rules) { if (rule.Action == AuthorizationRuleAction.Allow) { // manage the Users StringCollection } } The first item I get has 'alice' and 'bob' in the Users collection. The SECOND item I get has * Where is this second entry coming from? This is an Allow Rule, not a Deny rule. I could understand the * from a Deny rule. Is there some extra inheritance I'm not aware of?

    Read the article

  • What is the .NET attribuet to not compile a method is release mode

    - by Russ
    I know that if I have a block of code I don't want compiled when in release mode I can wrap that code block in: #if DEBUG while(true) { Console.WriteLine("StackOverflow rules"); } #endif This will keep this code block from compiling in any mode other than DEBUG. I know there is an attribute that can be placed on an entire method that will do that same, but for the life of me I can't remember what that attribute is. I believe that it’s down the System.Diagnostics namespace, but I'm not really sure. BTW: I'm using .NET 4, but I know this attribute existed in .NET 2 because I have used in in old projects. Thanks

    Read the article

  • Invoke or BeginInvoke cannot be called on a control until the window handle has been created

    - by blade3
    I am trying to install SQL Server 2008 Developer Edition x64 on a Windows Server 2008 VM. I run the installer for a standalone installation and this works fine for the setup support rules bit. That passes ok but then I get this error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.. BUTTONS: OK How can I resolve this? I am getting 2008 R2 CTP but this is just a CTP. My download is from DreamSpark. Thanks

    Read the article

  • Curious: Could LLVM be used for Infocom z-machine code, and if so how? (in general)

    - by jonhendry2
    Forgive me if this is a silly question, but I'm wondering if/how LLVM could be used to obtain a higher performance Z-Machine VM for interactive fiction. (If it could be used, I'm just looking for some high-level ideas or suggestions, not a detailed solution.) It might seem odd to desire higher performance for a circa-1978 technology, but apparently Z-Machine games produced by the modern Inform 7 IDE can have performance issues due to the huge number of rules that need to be evaluated with each turn. Thanks! FYI: The Z-machine architecture was reverse-engineered by Graham Nelson and is documented at http://www.inform-fiction.org/zmachine/standards/z1point0/overview.html

    Read the article

< Previous Page | 189 190 191 192 193 194 195 196 197 198 199 200  | Next Page >