joel weise - Page 11 - Developer IT

String to raw byte array

- by Joel

I have a string which contains binary data (non-text data). How do I convert this to a raw byte array?

How can I build something like Amazon S3 in Perl?

I am looking to code a file storage application in perl similar to amazon s3. I already have a amazon s3 clone that I found online called parkplace but its in ruby and is old also isn't built for high loads. I am not really sure what modules and programs I should use so id like some help picking them out. My requirements are listed below (yes I know there are lots but I could start simple then add more once I get it going): Easy API implementation for client side apps. (maybe REST (?) Centralized database server for the USERDB (maybe PostgreSQL (?). Logging of all connections, bandwidth used, well pretty much everything to a centralized server (maybe PostgreSQL again (?). Easy server side configuration (config file(s) stored on the servers). Web based control panel for admin(s) and user(s) to show logs. (could work just running queries from the databases) Fast High Uptime Low memory usage Some sort of load distribution/load balancer (maybe a dns based or pound or perlbal or something else (?). Maybe a cache of some sort (memcached or parlbal or something else (?). Thanks in advance

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Please help properly setting up path variables for root.php

- by Joel

Hi guys, I just posted a similar question, but deleted it because I realized I was working with an old file...doh! I am just trying to get my XAMPP setup working for me. I have a live site that navigates to a login page at http://www.monkeycalendar.com/arvindkt/login.php That login page includes a root.php file that is found at http://www.monkeycalendar.com/arvindkt/root.php Live site works great. My localhost is set up so my sites are a folder in localhost: IE: http://www.example.com = localhost/example.com I'm having problems figuring out how to make my root folder point to the right directory. Any help would be much appreciated: root.php: # local settings define("SITE_ROOT" , $_SERVER['DOCUMENT_ROOT']."/arvindkt"); define("SITE_URL" , "http://localhost/monkeycalendar.com"); define('DB_HOST', "localhost"); define('DB_USER', "root"); define('DB_PASS', ""); define('DB_NAME', "dev.monkeycalendar");

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YAML to CSV converter-does one exist already?

- by Joel

Hi folks, I'm wanting to migrate contacts from one CRM to another. The first only exports all the data I need in YAML. The second only imports with CSV. Is there a converter out there that already exists, or do I need to build one specific to this job? Thanks!

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Unit test class inherited from ContextBoundObject and decorated with ContextAttribute

- by Joel Cunningham

I am trying to retrofit unit tests on to some existing code base. Both the class and method I want to unit test is decorated with custom attributes that are inherited from ContextBoundObject and ContextAttribute. I dont want them to run as part of the unit test. The only solution I have come up with is to compile the attribute out when I want to unit test. I dont really like this solution and would prefer to either replace it with a mocked attribute at runtime or prevent the attribute from running in a more elegant way. How do you unit test code that has class and method attributes that inherit from ContextBoundObject and ContextAttribute that you dont want to run as part of a unit test? Thanks in advance.

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Possible Data Execution Prevention problem in Windows 7

- by Joel in Gö

I have a serious problem with my .Net program. It calls a native dll, and then crashes instantly because it can't find a native method. This is behaviour we have seen before, whereby the C# compiler, in its infinite wisdom, sets the flag that the program is DEP compatible, even if it calls a native dll which patently is not. We have the standard workaround for this, where the flag is set to Not DEP Compatible in a post-build step, and this works fine. Everywhere except on my machine. I have Windows 7 32bit, and the program works fine on the Win 7 64bit machines that we have, as well as on Vista and XP; we have not yet been able to check on another Win7 32bit. However, on my machine the DataExecutionPolicy_SupportPolicy is 0, i.e. we have successfully switched DEP off. The dll in question also works fine when called from a native program. We are running out of ideas... any help would be much appreciated!

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Flash video player doesn't play after rewriting a url

- by Joel

Hi! I recently started a new job working on a content management system. One of the jobs was to implement url rewriting, which i've done, but for some reason the URL rewriting has killed the ability to play flv files through FLVPlayer_Progressive. An example can be seen below: Working if you then follow the link on the menu and go to Campaigns It's a Living Thing you can see how it's not working when the url is being re-written. Below is the html for the object tag i'm setting within a gui editor on the admin side, everything on that end works also! <object height="160" width="284" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" id="FLVPlayer"> <param name="movie" value="/sitefiles/PeachSocial/flash/FLVPlayer_Progressive.swf"> <param name="salign" value="lt"> <param name="quality" value="high"> <param name="scale" value="noscale"> <param name="FlashVars" value="&MM_ComponentVersion=1&skinName=Clear_Skin_1&autoPlay=true&autoRewind=true&streamName=/sitefiles/PeachSocial/flash/dept_envrnmnt"> <embed src="/sitefiles/PeachSocial/flash/FLVPlayer_Progressive.swf" flashvars="&MM_ComponentVersion=1&skinName=Clear_Skin_1&autoPlay=true&autoRewind=true&streamName=/sitefiles/PeachSocial/flash/dept_envrnmnt" quality="high" scale="noscale" name="FLVPlayer" salign="LT" type="application/x-shockwave-flash" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" width="284" height="160"> </object> I would have thought giving the path the way i am would have taken it back to the server root and gone from there, but it doesn't seem to like it once the url rewriting happens. Anyways i'm outta ideas after a pretty frustrating day of trying to pass the thing absolute urls, relative paths and the like and am hoping a fresh set of eyes may help.

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I am getting an error when trying to use melt() on a dataframe containing Dates

- by Dan

I'd like to melt the dataframe so that in one column i have dates in a second i have username as the variable and finally the value. I'm getting this error: Error in as.Date.numeric(value) : 'origin' must be supplied and while I understand the error I'm not exactly sure how to get around it. A small sample of the data is: structure(list(created_at = structure(c(14007, 14008, 14009, 14010, 14011, 14012), class = "Date"), benjamin = c(16, 0, 0, 0, 0, 0), byron = c(0, 0, 0, 0, 0, 0), cameronc = c(0, 0, 0, 0, 0, 0), daniel = c(0, 0, 0, 0, 0, 0), djdiaz = c(0, 0, 0, 0, 0, 0), gene = c(16, 77, 64, 38, 72, 36), joel = c(0, 0, 0, 0, 0, 2), kerem = c(0, 0, 0, 0, 0, 0), sophia = c(0, 0, 0, 0, 0, 0), SuperMoonMan = c(0, 0, 0, 0, 0, 0)), .Names = c("created_at", "benjamin", "byron", "cameronc", "daniel", "djdiaz", "gene", "joel", "kerem", "sophia", "SuperMoonMan"), row.names = c(NA, 6L), class = c("cast_df", "data.frame")) Thanks for your help.

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Working with DataBinding and Page_Load in ASP.NET MVP

- by Joel

I'm using WebForms MVP to create some simple reporting applications. Most of these applications consist of a few search criteria inputs and a ComponentArt datagrid that I'm populating with data from the database. Most of the markup is in a UserControl, which is in a content page with a master page. My problem is that the control's Page_Load event is firing before the control events that caused the postback in the first place. Basically, the user clicks the search button, and Page_Load is fired BEFORE Search_Click. This is messing with the databinding scheme I've been using. So that's the question: Why is my Page_Load event firing before the event handler, and what can I do about it? I don't THINK this problem is related to WebForms MVP or ComponentArt, but obviously I could be wrong. Thanks.

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How can I write classes that don't rely on "global" variables?

- by Joel

When I took my first programming course in university, we were taught that global variables were evil & should be avoided at all cost (since you can quickly develop confusing and unmaintainable code). The following year, we were taught object oriented programming, and how to create modular code using classes. I find that whenever I work with OOP, I use my classes' private variables as global variables, i.e., they can be (and are) read and modified by any function within the class. This isn't really sitting right with me, as it seems to introduce the same problems global variables had in languages like C. So I guess my question is, how do I stop writing classes with "global" variables? Would it make more sense to pretend I'm writing in a functional language? By this I mean having all functions take parameters & return values instead of directly modifying class variables. If I need to set any fields, I can just take the output of the function and assign it instead of having the function do it directly. This seems like it might make more maintainable code, at least for larger classes. What's common practice? Thanks!

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How can I use data binding in WPF to create a new user control for each element in a list?

- by Joel

I have a list of objects. For each item in the list, I want to create a new user control bound to that item. From what I've read, doing this programmatically is bad practice with WPF (as well as less than straightforward), so I should use data binding as a solution instead. The problem is, I can't figure out how to do this. I don't know the contents of the list (just the type) at compile-time, so I can't create and bind with XAML for each element. Google and MSDN don't seem to have any answers, so maybe I'm thinking about this the wrong way? What do I need to do? Thanks

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AS3: Array of objects parsed from XML remains with zero length

- by Joel Alejandro

I'm trying to parse an XML file and create an object array from its data. The data is converted to MediaAlbum classes (class of my own). The XML is parsed correctly and the object is loaded, but when I instantiate it, the Albums array is of zero length, even when the data is loaded correctly. I don't really know what the problem could be... any hints? import Nem.Media.*; var mg:MediaGallery = new MediaGallery("test.xml"); trace(mg.Albums.length); MediaGallery class: package Nem.Media { import flash.net.URLRequest; import flash.net.URLLoader; import flash.events.*; public class MediaGallery { private var jsonGalleryData:Object; public var Albums:Array = new Array(); public function MediaGallery(xmlSource:String) { var loader:URLLoader = new URLLoader(); loader.load(new URLRequest(xmlSource)); loader.addEventListener(Event.COMPLETE, loadGalleries); } public function loadGalleries(e:Event):void { var xmlData:XML = new XML(e.target.data); var album; for each (album in xmlData.albums) { Albums.push(new MediaAlbum(album.attribute("name"), album.photos)); } } } } XML test source: <gallery <albums <album name="Fútbol 9" <photos <photo width="600" height="400" filename="foto1.jpg" / <photo width="600" height="400" filename="foto2.jpg" / <photo width="600" height="400" filename="foto3.jpg" / </photos </album <album name="Fútbol 8" <photos <photo width="600" height="400" filename="foto4.jpg" / <photo width="600" height="400" filename="foto5.jpg" / <photo width="600" height="400" filename="foto6.jpg" / </photos </album </albums </gallery

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AS3: Accessing variable declared on MovieClip's parent

- by Joel Alejandro

I have a frame which contains an mcMenubar MovieClip. On the frame, I have this code: import Nem.* import fl.transitions.Tween; import fl.transitions.easing.*; import fl.motion.Color; var pageLoader:SwfLoader = new SwfLoader(root, 199, 144); On the mcMenubar clip, I want to access that same pageLoader instance: var pageFile:String = "page-" + e.target.name.replace(/btn/gi, "").toLowerCase() + ".swf"; this.parent.loadPage("loadertest.swf"); // THIS WON'T WORK // var tweenMove:Tween = new Tween(gfxSelected, "x", Bounce.easeOut, gfxSelected.x, e.target.x, 1, true); currentlySelected = e.target.name; Apparently I'm getting this error: TypeError: Error #1010: A term is undefined and has no properties. at MethodInfo-71() How can I fix this?

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Storyboard elements are not sized properly on the device

- by Joel Fischer

In the storyboard, I am placing a table view element into a subclassed UIView. The element is not appearing on the iPad device I am running it on the same as it appears in the storyboard however. This also happens for additional content that I place into the storyboard. Below is a screenshot as it appears in the storyboard, as well as UI width/height information. And here is the description of the UI file running on the iPad. https://gist.github.com/4323186 (embedding it directly into the post is giving me problems) You'll notice that the tableview is explicitly set at 178 width, and is showing up in the description as 276 width. My initial thought was that perhaps a cell was forcing the parent to be larger (I'm very new to iOS UI development), but drilling into that shows the prototype cell it appears that the width is defined by it's parent at 178. The image views and label also are appearing in the incorrect spot, as shown in the second image below.

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F# Equivalent to Enumerable.OfType<'a>

- by Joel Mueller

...or, how do I filter a sequence of classes by the interfaces they implement? Let's say I have a sequence of objects that inherit from Foo, a seq<#Foo>. In other words, my sequence will contain one or more of four different subclasses of Foo. Each subclass implements a different independent interface that shares nothing with the interfaces implemented by the other subclasses. Now I need to filter this sequence down to only the items that implement a particular interface. The C# version is simple: void MergeFoosIntoList<T>(IEnumerable<Foo> allFoos, IList<T> dest) where T : class { foreach (var foo in allFoos) { var castFoo = foo as T; if (castFoo != null) { dest.Add(castFoo); } } } I could use LINQ from F#: let mergeFoosIntoList (foos:seq<#Foo>) (dest:IList<'a>) = System.Linq.Enumerable.OfType<'a>(foos) |> Seq.iter dest.Add However, I feel like there should be a more idiomatic way to accomplish it. I thought this would work... let mergeFoosIntoList (foos:seq<#Foo>) (dest:IList<'a>) = foos |> Seq.choose (function | :? 'a as x -> Some(x) | _ -> None) |> Seq.iter dest.Add However, the complier complains about :? 'a - telling me: This runtime coercion or type test from type 'b to 'a involves an indeterminate type based on information prior to this program point. Runtime type tests are not allowed on some types. Further type annotations are needed. I can't figure out what further type annotations to add. There's no relationship between the interface 'a and #Foo except that one or more subclasses of Foo implement that interface. Also, there's no relationship between the different interfaces that can be passed in as 'a except that they are all implemented by subclasses of Foo. I eagerly anticipate smacking myself in the head as soon as one of you kind people points out the obvious thing I've been missing.

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Keyboard selecting nested li's with jquery

- by Joel

I have a load of nested <ul>'s and <li>'s and I would like to be able to have a hover / selected class on an <li>, and use the keyboard up and down buttons to select up and down on the <li>s.. however they are nested and need to jump across <ul>s if necessary. For instance: <ul> <li class='cat'> cat 1 <ul> <li class='hover'>item 1</li> <li>item 2</li> <li>item 3</li> <li>item 4</li> </ul> </li> <li class='cat'> cat 2 <ul> <li>item 5</li> <li>item 6</li> <li>item 7</li> <li>item 8</li> </ul> <ul class='subcat'> <li class='cat'> Cat 3 <ul> <li>item 9</li> <li>item 10</li> <li>item 11</li> <li>item 12</li> </ul> </li> </ul> </li> <li class='cat'> cat 4 <ul> <li>item 13</li> <li>item 14</li> <li>item 15</li> <li>item 16</li> </ul> </li> </ul> As I press the down key I wish the items to be selected in numerical order (they do not have numerical order IDs and sometimes some of them are hidden so they should be ignored. But it needs to go to the next <li> that isn't a category and set that as hover.

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C# String to raw byte array

- by Joel

I have a string which contains binary data (non-text data). How do I convert this to a raw byte array?

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Possible Data Execution Prevention (DEP) problem in Windows 7

- by Joel in Gö

I have a serious problem with my .Net program. It calls a native dll, and then crashes instantly because it can't find a native method. This is behaviour we have seen before, whereby the C# compiler, in its infinite wisdom, sets the flag that the program is DEP compatible, even if it calls a native dll which patently is not. We have the standard workaround for this, where the flag is set to Not DEP Compatible in a post-build step, and this works fine. Everywhere except on my machine. I have Windows 7 32bit, and the program works fine on the Win 7 64bit machines that we have, as well as on Vista and XP; we have not yet been able to check on another Win7 32bit. However, on my machine the DataExecutionPolicy_SupportPolicy is 0, i.e. we have successfully switched DEP off. Does anyone know whether there is some situation in which it can still act? Or any other mechanism which could have the same effect? The dll in question also works fine when called from a native program. We are running out of ideas... any help would be much appreciated!

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ASP.Net RSS feed

- by Joel Coehoorn

How do I create an rss feed in ASP.Net? Is there anything built in to support it? If not, what third-party tools are available? I'm thinking webforms, not MVC, though I suppose since this isn't a traditional page the difference may be minimal.

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Can I debug with python debugger when using py.test somehow?

- by Joel

I am using py.test for unit testing my python program. I wish to debug my test code with the python debugger the normal way (by which i mean pdb.set_trace() in the code) but I can't make it work. Putting pdb.set_trace() in the code doesn't work (raises IOError: reading from stdin while output is captured). I have also tried running py.test with the option --pdb but that doesn't seem to do the trick if I want to explore what happens before my assertion. It breaks when an assertion fails, and moving on from that line means terminating the program. Does anyone know a way to get debugging, or is debugging and py.test just not meant to be together?

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iPhone: Proper use of View and View Controller

- by Joel

I've recently been doing a lot of Objective-C programming, and just got back into doing more iPhone development. I've done a lot of programming using MVC in other languages/frameworks, but I just want to make sure I'm using MVC properly in my iPhone Development. I created a new iPhone Utility Application, which creates two views: MainView and FlipsideView. Both have a controller (FlipsideViewController and MainViewController) and XIB file of their own. What I've been doing is putting the IBOutlet UIControl myControl variables in my MainView.h or FlipsideView.h files and then tying the controls in Interface Builder to those variables. Then I put any IBAction SomeAction myAction methods in the MainViewController.h and FlipsideViewController.h files and tying the events to those methods in Interface Builder. This seems to be conceptually correct, but seems to cause problems. Say I have a button that when clicked it changes a label's text. So the Controller doesn't have a clue of what the variable name of the label is in the OnTouchUp event handler for my button. So I make a @property for it. But since the MainViewController.view property isn't of type MyView, I get warnings or errors whenever I try to access those properties from the view controller. I am doing this correctly? Is there a better way to do this? If this is correct, how do I properly work with those variables without getting warnings or errors? Thanks

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Simple image server

- by Joel

I have a bunch of images that I need others to browse via a web browser in pretty much the same way as Apache-Gallery. I'd be able to dump all my images in a directory so that users hitting: http://server:port/directory would see small thumbnails and selecting an image would load it full size on a page with options to browse the previous or next image. I'm looking for a non Apache solution, much like the wonderfull Python simple http server, that can be launched anywhere with minimal configuration & fuss e.g. python -m SimpleHTTPServer 8000 In fact, the python solution above is pretty much want I want except it doesn't thumbnail the images but just a simple directory listing. Happy to use an app written in any common language so long as it is self contained and can run on linux on a custom port (and to re-iterate, not an Apache module).

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What should a developer know before building a public web site?

- by Joel Coehoorn

What things should a programmer implementing the technical details of a web site address before making the site public? If Jeff Atwood can forget about HttpOnly cookies, sitemaps, and cross-site request forgeries all in the same site, what important thing could I be forgetting as well? I'm thinking about this from a web developer's perspective, such that someone else is creating the actual design and content for the site. So while usability and content may be more important than the platform, you the programmer have little say in that. What you do need to worry about is that your implementation of the platform is stable, performs well, is secure, and meets any other business goals (like not cost too much, take too long to build, and rank as well with Google as the content supports). Think of this from the perspective of a developer who's done some work for intranet-type applications in a fairly trusted environment, and is about to have his first shot and putting out a potentially popular site for the entire big bad world wide web. Also: I'm looking for something more specific than just a vague "web standards" response. I mean, HTML, JavaScript, and CSS over HTTP are pretty much a given, especially when I've already specified that you're a professional web developer. So going beyond that, Which standards? In what circumstances, and why? Provide a link to the standard's specification. This question is community wiki, so please feel free to edit that answer to add links to good articles that will help explain or teach each particular point.

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Navingating to an .html file in the assembly

- by Joel

I’m working with the WPF WebBrowser control to navigate to a html page hosting Silverlight. It seems I cannot use the NavigateToString or NavigateToStream method since I have Silverlight content. The html content loads fine but not Silverlight. So I think I’ll have to use the Navigate method which takes an Uri. Now I html page I’d like to navigate to is in a .html file in my Visual Studio project so I will have to have a local uri of some sort. I don’t want the html file to be copied to the output folder since I don’t want to distribute it separately; I want it to be somehow included in the assembly. The problem is that the WebBrowser control doesn’t seem to allow relative Uris or pack://application: uris. How could I accomplish navingating to an .html file in the assembly?

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Trying to get these list items to display inline

- by Joel

I have several unordered lists that I want to display like this: <ul> <li><img></li> <li></li> //inline </ul> //linebreak <ul> <li><img></li> <li></li> //inline </ul> ...etc I'm not able to get the li items to be inline with eachother. They are stacking vertically. I have stripped away most styling but still can't figure out what I'm doing wrong: html: <ul class="instrument"> <li class="imagebox"><img src="/images/matepe.jpg" width="247" height="228" alt="Matepe" /></li> <li class="textbox">The matepe is a 24 key instrument that is played by the Kore-Kore people in North-Eastern Zimbabwe and Mozambique. It utilizes four fingers-each playing an individual melody. These melodies also interwieve to create resultant melodies that can be manipulated thru accenting different fingers. The matepe is used in Rattletree as the bridge from the physical world to the spirit world. The matepe is used in the Kore-Kore culture to summon the Mhondoro spirits which are thought to be able to communicate directly with Mwari (God) without the need of an intermediary.</li> </ul> <ul class="instrument"> <li class="imagebox"><img src="/images/soprano_little.jpg" border="0" width="247" height="170" alt="Soprano" /></li> <li class="textbox">The highest voice of the Rattletree Marimba orchestra is the Soprano marimba. The soprano is used to whip up the energy on the dancefloor and help people reach ecstatic state with it's high and clear singing voice. The range of these sopranos goes much lower than 'typical' Zimbabwean style sopranos. The sopranos play the range of the right hand of the matepe and go two notes higher and five notes lower. Rattletree uses two sopranos.</li> </ul> <ul class="instrument"> <li class="imagebox"><img src="/images/bari_little.jpg" border="0" width="247" height="170" alt="Baritone" /></li> <li class="textbox">The Baritone is the next lower voice in the orchestra. The bari is where the funk is. Generally bubbling over the Bass line, the baritone creates the syncopations and polyrhythms that messes with the 'minds' of the dancers and helps seperate the listener from the physical realm of thought. The range of the baritone covers the full range of the left hand side of the matepe.</li> </ul> <ul class="instrument"> <li class="imagebox"><img src="/images/darren_littlebass.jpg" border="0" width="247" height="195" alt="Bass"/>Bass Marimba</li> <li class="textbox">The towering Bass Marimba is the foundation of the Rattletree Marimba sound. Putting out frequencies as low as 22hZ, the bass creates the drive that gets the dancefloor moving. It is 5.5' tall, 9' long, and 4' deep. It is played by standing on a platform and struck with mallets that have lacross-ball size heads (they are actually made with rubber dog balls). The Bass marimba's range covers the lowest five notes of the matepe and goes another five notes lower.</li> </ul> <ul class="instrument"> <li class="imagebox"><img src="/images/wayne_little.jpg" border="0" width="247" height="177" alt="Drums"/>Drumset</li> <li class="textbox">All the intricate polyrhythms are held together tastefully with the drumset. The drums provides the consistancy and grounding that the dancers need to keep going all night. While the steady kick and high-hat provide that grounding function, the toms and snare and allowed to be another voice in the poylrhythmic texture-helping the dancers abandon the concept of a "one" within this cyclical music.</li> </ul> css: ul.instrument { text-align:left; display:inline; } ul.instrument li { list-style-type: none; } li.imagebox { } li.textbox { } li.textbox p{ width: 247px; }

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