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Articles indexed in April 2010

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  • Mathematica quickie: About making cells Input cells by default.

    - by andrz
    I'm going through some lecture notes, Fundamentals of Mathematica Programming (see the .nb file there). I'd like to be able to do the exercises right there in the notebook; but for some reason I can't figure out how to make the default cell an Input cell. In other words, when I'm clicking in that notebook to create a new cell--in the exercises--the cell is by default a text cell. I'd like for it to be an Input cell so that I don't have to manually change it each time. Ideas?

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  • Why would Ruby fail equality on 2 floats that appear the same?

    - by btelles
    Hi there, I have a calculation that generates what appears to be the Float 22.23, and a literal 22.23 like so: some_object.total => 22.23 some_object.total.class => Float 22.23 => 22.23 22.23.class => Float But for some reason, the following is false: some_object.total == 22.23 ? true : false Wacky, right? Is there some kind of precision mechanism being used that maybe isn't completely transparent through the some_object.total call?

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  • Sorting a nodeset before passing to xsl:for-each

    - by Zack Mulgrew
    I have a situation where loop through a sorted nodeset and apply a template on each of the nodes: <div id="contractscontainer"> <xsl:for-each select="document"> <xsl:sort select="content[@name='ClientName']/text()" /> <xsl:apply-templates select="." mode="client-contract" /> </xsl:for-each> </div> I want to do something special with the "first" 5 nodes in the node set and render them nested element. The problem is that they need to be in the same order as if they were sorted (as they are in the loop). I had planned on doing this by using two xsl:for-each elements, each with the correct nodes selected from the set. I can't do this, however, because they need to be sorted before I can select the "first" 5. Example: <div id="contractscontainer"> <div class="first-five"> <xsl:for-each select="document[position() < 6]"> <xsl:sort select="content[@name='ClientName']/text()" /> <xsl:apply-templates select="." mode="client-contract" /> </xsl:for-each> </div> <div class="rest-of-them"> <xsl:for-each select="document[position() > 5]"> <xsl:sort select="content[@name='ClientName']/text()" /> <xsl:apply-templates select="." mode="client-contract" /> </xsl:for-each> </div> </div> I don't think this will work because I'm selecting the nodes by position before sorting them, but I can't use xsl:sort outside of the xsl:for-each. Am I approaching this incorrectly?

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  • jquery ui-tabs widget , changing the color of the background with css causes problem with display

    - by Ronedog
    I'm using the jquery tabs plugin and want to have the background a light grey color. In the css section for tabs, I found this line of code where I manually added the background-color part: .ui-tabs .ui-tabs-panel { padding: 1em 1em; display: block; border-width: 0; background-color:#EEEEEE;} The problem comes as seen in the picture below, where the grey background is only extending down part of the way. I initially thought I could update the div container with the same background color, but it didn't work. It looks like that white portion below might be some kind of padding, so I looked for that in the css but everything I tried had the same effect. Anyone got some ideas? This is what the HTML looks like (Theoretically): <div id="tabs_here"> <ul> <li><a href="#" onclick="$('#T_1').html('Display the data');" >Item Groups</a> </li> </ul> <div id="T_1"></div> </div>

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  • An alternative way to request read reciepts

    - by lavanyadeepak
    An alternative way to request read reciepts Sometime or other we use messaging namespaces like System.Net.Mail or System.Web.Mail to send emails from our applications. When we would need to include headers to request delivery or return reciepts (often called as Message Disposition Notifications) we lock ourselves to the limitation that not all email servers/email clients can satisfy this. We can enhance this border a little now, thanks to a new innovation I discovered from Gawab. It embeds a small invisible image of 1x1 dimension and the image source reads as recieptimg.php?id=2323425324. When this image is requested by the web browser or email client, the serverside handler does a smart mapping based on the ID to indicate that the message was read. We call them as 'Web Bugs'. But wait it is not a fool proof solution since spammers misuse this technique to confirm activeness of an email address and most of the email clients suppress inline images for security reasons. I just thought anyway would share this observation for the benefit of others.

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  • Source Browsing in FireFox

    - by lavanyadeepak
    Source Browsing in FireFox Just casually observed this a few minutes back with my Mozilla Firefox 3.6.3. When you do a view source of any  page in Internet Explorer it just renders as editable inoperative HTML. However in Firefox the hyperlinks are shown clickable and active. When you click on any hyperlink the most obvious and expected output would be that the target page would appear in one of the new tab in the parent browser. However the View Source window refreshed with the HTML source of the new page. I believe this gesture of Firefox would help us to take a journey back into Lynx Text Browsing in a way.

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  • AWS Application - Subscription Payments Scheduled but Not Initializing

    - by nicorellius
    I briefly browsed the AWS forums but these are not nearly as easy to use and efficient as Stack Exchange derived ones, so here I am... the company I work for has an app on the AWS cloud. In general the app works well. However, since it is new, we haven't had many customers and the ones who signed up are now coming to the point where their subscriptions to our service should be renewed. In comes my question. When I query the database for payment status of certain subscriptions using the console, I get what I would expect: Instrument XYZ is on a Monthly subscription (subscription=xxxyyyzz). The subscription is active with an expiration date of 19 Apr 2010 10:43 Z The payment token will expire on 1 Dec 2012 12:00 Z There are xy runs remaining. The subscription fee of $XX.xx will be charged on 17 Apr 2010 10:43 Z OK, this is great. According to this, I would expect the next payment to be initiated on 17 Apr. The reason I am asking is because for a different user last month I got this same output but the payment never went through, i.e., was not initiated through Amazon payments. The user didn't see the payment go through and neither did we. It should be noted that the initial payments were received. The sign up process works and if the user goes to "pay" from within our app, they will be directed to https://payments.amazon.com to make their payment. Any ideas?

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  • Why do I get a PHP 5.2.6 segmentation fault when using PDO_SQlite?

    - by danieltalsky
    This is an installation on ModWest's shared hosting. I have enabled both PDO and PDO_sqlite on the server and phpinfo() verifies both are running. When I access PDO itself, I'm fine, and getting a meaningful error. <?php $dbh = new PDO(""); ?> This gives me an "Invalid Connection String" error. But, as soon as I begin a connection string with sqlite:, I get a total crash. When I run via the webserver, I'm seeing NO error. When I enter a nonexistant filename, PHP does indeed create the file. I tried running the constructor via CLI and there I do get a simple error: Segmentation Fault I'm not seeing ANYTHING in the PHP 5.2.6 changelogs about this bug. Anyone have any additional troubleshooting steps? The OS is Debian 5.0.4

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  • Best use of a RAM disk?

    - by JamesHannah
    Just wondering, have you ever made anything useful with a RAM disk in production? I wonder if the performance benefit they afford possibly outweighs their temporary nature in a specific circumstance. I've only ever used one once, and it wasn't for performance. It was when I needed some writable disk space on a server showing hard drive errors – it gave just enough space for me to install the 3ware RAID utility to identify the dodgy disk. How have you used a RAM disk in production?

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  • ipad - printing

    - by krasnyk
    I know that you can buy Pages, Numbers and Keynote for iPad. Another question is if it is possible to print documents made with those applications with iPad? If so how? Only by WI-FI?

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  • LAN access via USB from Ipod Touch?

    - by Alec
    I need to browse the local web server from my Ipod Touch to test apps we're developing. I'm not allowed to install a separate wireless access point which would be the easiest solution. Can I use the USB cable for this? Also, the local PC is a Dell Mini 9 running Ubuntu. Has anyone managed to use the wireless port to create an ad hoc connection to an Ipod Touch so the Ipod can browse the Ubuntu web server? This would be an alternate option for me. Thank you!

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  • What's the best ramdisk for Windows?

    - by Dan Fabulich
    Just Googling for "windows ramdisk" returns a lot of stuff; some free, some paid. Can someone recommend a good one? (I'm willing to pay, but only if it's really worth paying for.) Here's what I'm looking for: Works on XP and Vista Supports 64 bit and 32 bit I'd like it to support more than 2GB of space (is that even possible on a 32 bit operating system?) I think I want something that can avoid swapping the ramdisk pages. (Though swapping would give me more free space; maybe I'll want to swap the ramdisk pages eventually? Is this configurable?)

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  • Network connection via USB

    - by Fco
    Can I get my Nexus One/Android on my local network over USB instead of WiFi and browse to my computer's IP address, the one to which the phone would be connected to, via USB? For instance, let's say my computer has an IP address 100.1.1.1 and when I go to it from the computer I would go to my localhost and see a website I've set up locally in the computer. Then, I connect my phone to that computer via USB. Can I then go to 100.1.1.1 from the browser and see the same website? All this through the USB, no WiFi?

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  • Measuring Social Media Efforts

    - by David Dorf
    So you're on the bandwagon and you've created a Facebook page, you're tweeting everyday, and maybe you've even got a YouTube channel. Now what? After you put any program in place, you need to measure, set new goals, then execute and this is no different. But how does one measure social media efforts? First, I guess we need some goals. Typical ones might be to acquire customers, engage them, then convert them. So that translates to: Increase Facebook fans and Twitter followers Increase comments/posting and retweets Increase redemption of offers via Facebook and Twitter Counting fans and followers is easy, and tracking the redemption of coupons isn't that hard either, but measuring engagement is a tough one. How do you know whether your fans are reading your posts, and whether your posts have any meaning to them? For Facebook, the fan page administrator has access to analytics called Facebook Insights. There you can check weekly metrics such as total fans, new fans, lost fans, demographics of fans, number of postings, numbers clicks, etc. Not nearly as comprehensive as Google Analytics, but well on its way. For Twitter, getting information is a little tougher. Again, its easy to track followers and you can use tools like TweetMeme to encourage and track retweets. An interesting website called WeFollow tries to measure influence for certain topics. For example, the top three influencers for the topic "retail" are retailweek, retailwire, and retailerdaily. Other notables are #10 BestBuy, #11 GapOfficial, #12 JeffPR, and #17 OracleRetail. I assume influence is calculated based on number of followers, number of retweets, frequency of tweets, and perhaps depth of dialogs. If you want to get serious about monitoring and measuring social marketing efforts, you'd be wise to invest in a strong tool. Several are listed on this wiki, including big ones like Radian6, Nielsen, Omniture, and Buzzient. Buzzient might be particularly interesting because its integrated with Oracle CRM OnDemand -- see the demo. As always, I'm interested in hearing how others approach goal setting and monitoring of social media efforts, so feel free to post comments.

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  • prevent linux thread from being interrupted by scheduler

    - by johnnycrash
    How do you tell the thread scheduler in linux to not interrupt your thread for any reason? I am programming in user mode. Does simply locking a mutex acomplish this? I want to prevent other threads in my process from being scheduled when a certain function is executing. They would block and I would be wasting cpu cycles with context switches. I want any thread executing the function to be able to finish executing without interruption even if the threads' timeslice is exceeded.

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  • .NET Rectangle Off By 1

    - by roygbiv
    After working with the .NET GDI+ Rectangle object, I've noticed that if I create a rectangle that is X:0 * Y:0 * Width:100 * Height:100, the Right and Bottom properties are set to 100, 100. Shouldn't this be 99, 99? 0 - 99 is 100 pixels. 0 - 100 is 101 pixels. FWIW, the documentation does say the right is computed by x + width and the bottom is y + height, but is that correct? Perhaps "correct" doesn't matter here as long it's consistent? All I know is that it is somewhat (read... very) annoying!

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  • NoneType has no attribute Append

    - by Rosarch
    I'm new to Python. I can't understand why a variable is None at a certain point in my code: class UsersInRoom(webapp.RequestHandler): def get(self): room_id = self.request.get("room_id") username = self.request.get("username") UserInRoom_entities = UserInRoom.gql("WHERE room = :1", room_id).get() if UserInRoom_entities: for user_in_room in UserInRoom_entities: if user_in_room.username == username: user_in_room.put() # last_poll auto updates to now whenenever user_in_room is saved else: user_in_room = UserInRoom() user_in_room.username = username user_in_room.put() UserInRoom_entities = [] UserInRoom_entities.append(user_in_room) // error here # name is `user_at_room` intead of `user_in_room` to avoid confusion usernames = [user_at_room.username for user_at_room in UserInRoom_entities] self.response.out.write(json.dumps(usernames)) The error is: Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 507, in __call__ handler.get(*groups) File "path\to\chat.py", line 160, in get AttributeError: 'NoneType' object has no attribute 'append' How is this possible? I'm setting UserInRoom_entities = [] immediately before that call. Or is something else the None in question?

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  • How to change a class's content using jQuery

    - by coffeeaddict
    Here is the div element on my page: How can I change a class's content? So from existing which is: class="jcarousel-next jcarousel-next-horizontal" to class="jcarousel-next jcarousel-next-horizontal jcarousel-next- disabled jcarousel-next-disabled-horizontal" Do I need to completely remove it by using removeClass and then re-add?

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  • Generic data input form in asp.net mvc application

    - by Diego
    Hello, I have an application that have EF 16 classes that share this information: They all are classes only with a key field and a description. I think it should be a waste if I make a controller with just 1 method just to present a form to fill these classes info, then I was thinking in to make a generic form(with key, description) and dynamically fill the right class through a sort of selection the selected info in any way, any good suggestion or pattern to do that? Where the generic methods should be located.

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