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  • How many significant digits should I use for double literals in Java?

    - by M. Dudley
    How many significant digits should I use when defining a double literal in Java? This is assuming that I am trying to represent a number with more significant figures than a double can hold. In Math.java I see 20 and 21: public static final double E = 2.7182818284590452354; public static final double PI = 3.14159265358979323846; This is more than the 15-17 significant digits provided by IEEE 754. So what's the general rule-of-thumb?

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  • Trap error or 'Resume Next'

    - by Craig Johnston
    I realise this is an older programming environment, but I have to clean up some VB6 code and I am finding that most of it uses: Resume Next What is the general consensus about the use of Resume Next? Surely, if there is an error, you would want the app to stop what it was doing, rollback any data changes, and inform the user of the error, rather than just resuming. When is it good idea to use Resume?

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  • What is best approach for connection pooling?

    - by Bhushan
    I am implementing connection pooling in project. Performance wise which is better approach to do it? Hibernate (using C3PO or DBCP) Configuring JDBC data-source in Application server. Application server Portability is not an important factor for me. Please suggest the approach.

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  • Using multiple aggregate functions in an algebraic expression in (ANSI) SQL statement

    - by morpheous
    I have the following aggregate functions (AGG FUNCs): foo(), foobar(), fredstats(), barneystats(). I want to know if I can use multiple AGG FUNCs in an algebraic expression. This may seem a strange/simplistic question for seasoned SQL developers - however, the but the reason I ask is that so far, all AGG FUNCs examples I have seen are of the simplistic variety e.g. max(salary) < 100, rather than using the AGG FUNCs in an expression which involves using multiple AGG FUNCs in an expression (like agg_func1() agg_func2()). The information below should help clarify further. Given tables with the following schemas: CREATE TABLE item (id int, length float, weight float); CREATE TABLE item_info (item_id, name varchar(32)); # Is it legal (ANSI) SQL to write queries of this format ? SELECT id, name, foo, foobar, fredstats FROM A, B (SELECT id, foo(123) as foo, foobar('red') as foobar, fredstats('weight') as fredstats FROM item GROUP BY id HAVING [ALGEBRAIC EXPRESSION] ORDER BY id AS A), item_info AS B WHERE item.id = B.id Where: ALGEBRAIC EXPRESSION is the type of expression that can be used in a WHERE clause - for example: ((foo(x) < foobar(y)) AND foobar(y) IN (1,2,3)) OR (fredstats(x) <> 0)) I am using PostgreSQL as the db, but I would prefer to use ANSI SQL wherever possible. Assuming it is legal to include AGG FUNCS in the way I have done above, I'd like to know: Is there a more efficient way to write the above query ? Is there any way I can speed up the query in terms of a judicious choice of indexes on the tables item and item_info ? Is there a performance hit of using AGG FUNCs in an algebraic expression like I am (i.e. an expression involving the output of aggregate functions rather than constants? Can the expression also include 'scaled' AGG FUNC? (for example: 2*foo(123) < -3*foobar(456) ) - will scaling (i.e. multiplying an AGG FUNC by a number have an effect on performance?) How can I write the query above using INNER JOINS instead?

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  • CFBundleDocumentTypes & UIFileSharingEnabled issues

    - by carloe
    Has anyone gotten UIFileSharingEnabled or CFBundleDocumentTypes to work? I added UIFileSharingEnabled as true to my plist and used Apple's example from the link below for CFBundleDocumentTypes, but can't seem to get it to work. I don't see my app under file sharing in iTunes, and I do not get the option to open documents I registered in my app when I click on them in the mail.app http://developer.apple.com/iphone/library/documentation/General/Conceptual/iPadProgrammingGuide/CoreApplication/CoreApplication.html

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  • separating JSS from CSS at plone.htmlhead

    - by badchoosed
    Hey there! I'm using Plone 3.1.7 in a project that needs performance tweaks. One of the tweaks requests that CSS should be at the top of page and the JS should be at the bottom. However both are located at <div tal:replace="structure provider:plone.htmlhead" /> In main_template. How do I split these ones? Thanks in advance

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  • How can I create a Google Visualization intensity/heat map using a KMZ document?

    - by dommer
    I'd like to create a Google Visualization API intensity/heat map based on UK counties. To do this, it appears that I need to use a custom KML/KMZ file that contains the county mapping data (which I've located). Could anyone provide me with a sample of how I can display an intensity map based on a KMZ file? I know how to display Google Visualization intensity maps in general. I just can't find any examples that use a custom KMZ file.

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  • Best practice for handling ConnectionDroppedHandler in OCS Server Application

    - by Paul Nearney
    Hi all, In general, it seems that the majority of times that ConnectionDroppedHandler would get called in an OCS server application is for expected reasons e.g. server application has been unregistered, server is shutting down, etc. Are there any unexpected situations in which ConnectionDroppedHandler can be called? Basically, i'm wondering whether it will ever be necessary to log an error to the event log from this event handler. Many thanks, Paul

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  • What is the object of the Contact application search option ?

    - by Spredzy
    Hi all, I am wondering what is the kind of object that shows up when in the Contact application, you hit search option, what is it ? a Custom Quick Search Bar, a custom notificaction bar, other idea ... An image of what I am talking about is available here : http://www.developpez.net/forums/attachments/p60921d1270798944/java/general-java/java-mobiles/android/cet-objet-image-jointe/screen-shot-2010-04-09-at-9.37.38-am.png/ Thank you all

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  • Benefits of 'Optimize code' option in Visual Studio build

    - by gt
    Much of our C# release code is built with the 'Optimize code' option turned off. I believe this is to allow code built in Release mode to be debugged more easily. Given that we are creating fairly simple desktop software which connects to backend Web Services, (ie. not a particularly processor-intensive application) then what if any sort of performance hit might be expected? And is any particular platform likely to be worse affected? Eg. multi-processor / 64 bit.

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  • Open Technology: Nanorobots Answer to US Navy

    - by adrianocavalcanti
    Hi Everybody, Just wondering if some has some suggestion about open technology licensing. I have been working on nanotechnology -- here some info: * Nanorobot Technology: What to Expect from Science - A Personal Letter in Answer to United States Navy http://www.linuxquestions.org/questions/general-10/nanorobot-technology-what-to-expect-from-science-814060 and started an initiative towards open nanotechnology since last october. All comments and suggestions are highly appreciated.

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  • Optimize MYSQL Query with Order by

    - by Victor
    Hello, I have seen mysql queries with order by runs slow. Is there any specific way to optimize queries which use order by ? Queries without order by run very fast but with order by its always runs slow. if any one suggest any thing on this as general solutions. Thank You

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  • JavaScript: How to get text from all descendents of an element, disregarding scripts?

    - by Bungle
    My current project involves gathering text content from an element and all of its descendents, based on a provided selector. For example, when supplied the selector #content and run against this HTML: <div id="content"> <p>This is some text.</p> <script type="text/javascript"> var test = true; </script> <p>This is some more text.</p> </div> my script would return (after a little whitespace cleanup): This is some text. var test = true; This is some more text. However, I need to disregard text nodes that occur within <script> elements. This is an excerpt of my current code: // get text content of all matching elements for (x = 0; x < selectors.length; x++) { matches = Sizzle(selectors[x], document); for (y = 0; y < matches.length; y++) { match = matches[y]; if (match.innerText) { // IE content += match.innerText + ' '; } else if (match.textContent) { // other browsers content += match.textContent + ' '; } } } It's a bit overly simplistic in that it just returns all text nodes within the element (and its descendants) that matches the provided selector. The solution I'm looking for would return all text nodes except for those that fall within script elements. It doesn't need to be especially high-performance, but I do need it to ultimately be cross-browser compatible. I'm assuming that I'll need to somehow loop through all children of the element that matches the selector and accumulate all text nodes other than ones within <script> elements; it doesn't look like there's any way to identify JavaScript once it's already rolled into the string accumulated from all of the text nodes. I can't use jQuery (for performance/bandwidth reasons), although you may have noticed that I do use its Sizzle selector engine, so jQuery's selector logic is available. Thanks in advance for any help!

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  • Are GUIDs the ultimate ID?

    - by mafutrct
    I noticed some people don't bother having the usual incremented number as ID but instead simply generate a GUID. The advantages include: Quick and easy No need to keep track of previous IDs Guaranteed to be unique even across machines without knowledge of each other Some disadvantages are: Possibly performance bottleneck Uses a large number of bytes My understanding is that using a GUID is beneficial in most cases, except if optimization for time or space is an issue. Did I miss something? Or do you agree with this idea?

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  • Access to the registry key 'Global' is denied.

    - by Vivek Rathore
    While giving permissions to the 'defaultAppPool' user I am getting the message 'There is no such global user or group: DefaultAppPool.' Can anyone help me here! However, using command 'net localgroup "Performance Monitor Users" DefaultAppPool /add' I am able to resolve the error but i am facing this problem in Windows Server 2003/IIS 6.0. Here, I am always prompted as 'There is no such global user or group: DefaultAppPool.' I have also added the 'Network Service' but no avail.

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  • X (close) shape in SVG

    - by danke
    I'm trying to make this SVG shape (ignore the color background, just the X shape) Close SVG Path but don't have Illustrator and wouldn't know how to use it. Can someone help out with the general idea, or point me to alternatives. I'm using it in flex.

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  • How has RIA technology evolved and what technology stack currently rules this domain?

    - by Rachel
    I am new to RIA and have not been actively involved with this technology in my projects as we using server-side Java, but I want to gain some experience with RIA. My questions are: How has RIA technology evolved and in your opinion? What technology stack currently rules this domain? What are the recommended resources for learning RIA? In general what is the suggested approach for getting started on the RIA journey?

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  • Finding patterns in source code

    - by trex279
    If I wanted to learn about pattern recognition in general what would be a good place to start (recommend a book)? Also, does anybody have any experience/knowledge on how to go about applying these algorithms to find abstraction patterns in programs? (repeated code, chunks of code that do the same thing, but in slightly different ways, etc.) Thanks Edit: I don't mind mathematically intensive books. In fact, that would be a good thing.

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