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• Exposing.NET assembly as COM 101

  - by Jan Zich

  I have trouble to expose a .NET assembly in COM. It seems that I must be missing some basic step because I think I followed all tutorials and documentation I found as well as common sense, but still when I do (in a test VBScript): Set o = CreateObject("MyLib.MyClass") It keeps saying that the object cannot be created. Here are the steps I have done: I have simple one method dummy class with no attributes. The class is in a class library which has "Make assembly COM-visible" ticked in Visual Studio. The class library is signed. The DLL is registered via RegAsm.exe with the /codebase parameter (I don’t want / cannot add the DLL to GAC). Just to be sure, I tried to copy the library to the same directory as the test VBScript, but it does not help. Edit: I should have mentioned that the I can instantiate the class in COM if I put the DLL into GAC.

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• OpenCL: does it play well with OpenMP, can I connect other languages to it, etc.

  - by Cem Karan

  The 1.0 spec for OpenCL just came out a few days ago (Spec is here) and I've just started to read through it. I want to know if it plays well with other high performance multiprocessing APIs like OpenMP (spec) and I want to know what I should learn. So, here are my basic questions: If I am already using OpenMP, will that break OpenCL or vice-versa? Is OpenCL more powerful than OpenMP? Or are they intended to be complementary? Is there a standard way of connecting an OpenCL program to a standard C99 program (or any other language)? What is it? Does anyone know if anyone is writing an OpenCL book? I'm reading the spec, but I've found books to be more helpful.

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• mysql, sqlite database source code

  - by Yang

  hi guys, i know implementing database is a huge topic, but i want to have a basic understanding of how database systems works (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database, since there are a few already proven very robust open source databases like mysql, sqlite and so on. however, the code are very complicated and i have no clue where to start. also i find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how should i get started and is there any books that emphasis on the technology and techniques of building dbms used in modern database industry? Thank in advance!

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• SqlPlus on mac osx 10.6 doesn't work

  - by lesce

  When i try to run this #sqlplus system@orcl it gives me this error SQL*Plus: Release 10.1.0.3.0 - Production on Tue Apr 20 02:24:41 2010 Copyright (c) 1982, 2004, Oracle. All rights reserved. Enter password: ERROR: ORA-12154: TNS:could not resolve the connect identifier specified the oracle server is working , I can connect through SQLDeveloper My .profile looks like this export PATH=/opt/local/bin:/opt/local/sbin:$PATH # Setting PATH for Python 3.1 # The orginal version is saved in .profile.pysave PATH="/Library/Frameworks/Python.framework/Versions/3.1/bin:${PATH}" DYLD_LIBRARY_PATH=/Users/lesce/instantclient export TNS_ADMIN=/Users/lesce/instantclient export ORACLE_SID="orcl" export DYLD_LIBRARY_PATH export PATH=$PATH:/Users/lesce/instantclient tnsnames.ora ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) listener.ora SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = PLSExtProc) (ORACLE_HOME = /Users/oracle/oracle/product/10.2.0/db_1) (PROGRAM = extproc) ) (SID_DESC = (SID_NAME = orcl) (ORACLE_HOME = /Users/oracle/oracle/product/10.2.0/db_1) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0)) ) ) My SqlDeveloper configuration username : sys role : sysdba connection type : basic hostname : localhost port : 1521 sid : orcl

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• Ruby on Rails protect_from_forgery best practice

  - by randombits

  I'm currently working on building a RESTful web api with ruby on rails. I haven't bothered putting a proper authentication scheme into the API yet as I'm ensuring that tests and the basic behavior of the API is working all locally first. Upon testing non-HTTP GET type requests such as HTTP POST/DELETE/PUT, stuff chokes because protect_from_forgery is on by default. How does this work when I'm working in practice since essentially the idea is in a RESTful API that there is no state. The client does not have a session or a cookie associated with the server. Each request is an atomic, self-executed request. The user will supply some credentials to ensure they are who they say they are, but other than that, does protect_from_forgery make sense at this point? Should it remain enabled?

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• Struts2 <s:bean/> tag, used to instanciate a Parametric Bean

  - by Rasatavohary

  Hi, After looking a while other google, and the web, I decided to post my question here. The question is quite really basic, and simple : How do I use the struts2 tag <s:bean ... /> to instanciate a Parametric Bean ? For example imagine I have : public class GenericBean<T> { ... How will I instanciate this bean with a BeanType for instance, inside a jsp using struts 2 ? <s:bean name="GenericBean" var="myBean"/> Thanks you.

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• Firebug not showing Javascript errors for Rails applications

  - by 99miles

  I have a Rails application, and when I have Javascript errors they are not showing in the Firebug console. I have 'Show javascript errors' and 'Show javascript warnings' selected. When I insert javascript errors in a basic html file, the errors show as expected. In the javascript of the Rails app, it only shows errors in rare cases. For example i can insert nonsense like: dfghaefb; and no error is shown in Firebug. But if i insert a space in there Firebug does show the error: dfgh aefb; Any ideas? This is driving me nuts.

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• LINQ aggregate / SUM grouping problem

  - by Chrissi

  I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so: Dim result = (From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID Join p As Models.Product In Data.Products.GetAll On i.ProductID Equals p.ID Join pg As Models.ProductGroup In Data.ProductGroups.GetAll On p.ProductGroupID Equals pg.ID Join gl As Models.GLAccount In Data.GLAccounts.GetAll On pg.GLAccountSellID Equals gl.ID Where (gl.ID = GLID) Select ih.Period,i.ExtendedValue) What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context, and I'm not sure how else to go about it.

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• How do i start Game programming in windows phone xna?

  - by Ankit Rathod

  Hello, I am very much interested in Game programming in Xna. However during my college days i did not take Physics or Maths. Does that mean i can't create games in xna? I just know basics of trignometry. Can you all point me to few links where i can learn xna as well as the basic stuff of Maths that is bound to be required in most of the games? Are all game programmers excellent in Maths and Physics ? Thanks in advance :)

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• Java Junit testing problem

  - by agazerboy

  Hi All, I am using Junit 4. My whole program is working fine. I am trying to write a test case. But there is one error... here is very basic sample test public class di extends TestCase{ private static Records testRec; public void testAbc() { Assert.assertTrue( "There should be some thing.", di.testRec.getEmployee() > 0); } } and when i run this it give me error that fName can not be null if i use super and do like this public TestAgnes() { super("testAbc"); } it work all fine. It wasn't this before with JUnit 3.X am I doing wrong or they changed it :( Sorry if I am not clear Is there any way to executre test without super? or calling functions etc. ?

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• App engine datastore - query on Enum fields.

  - by Gopi

  I am using GAE(Java) with JDO for persistence. I have an entity with a Enum field which is marked as @Persistent and gets saved correctly into the datastore (As observed from the Datastore viewer in Development Console). But when I query these entities putting a filter based on the Enum value, it is always returning me all the entities whatever value I specify for the enum field. I know GAE java supports enums being persisted just like basic datatypes. But does it also allow retrieving/querying based on them? Google search could not point me to any such example code. Details: I have printed the Query just before being executed. So in two cases the query looks like - SELECT FROM com.xxx.yyy.User WHERE role == super ORDER BY key desc RANGE 0,50 SELECT FROM com.xxx.yyy.User WHERE role == admin ORDER BY key desc RANGE 0,50 Both above queries return me all the User entities from datastore in spite of datastore viewer showing some Users are of type 'admin' and some are of type 'super'.

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• Using FourSquare API in a Rails App

  - by MikeH

  Anybody have any good resources that might be helpful in trying to integrate the FourSquare API into a Rails app? I'm specifically looking for a good tutorial. There doesn't seem to be much out there yet. There are a few ruby gems, but they are pretty bare bones and I need a bit more hand-holding. Here is a resource that I've found so far: http://tedgrubb.com/ Stack Overflow won't let me include a second hyperlink, but you can also google: Foursquare ruby gem for another resource. I have not done much work with APIs in the past, but I am very comfortable with Rails. What I need is a little better sense of exactly where all the pieces fit. A basic tutorial is what I'm looking for. Thanks.

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• Killing HTML nodes from shell

  - by hendry

  Need a solution to kill nodes like <footer>foobar</footer> and <div class="nav"></div> from many several HTML files. I want to dump a site to disk without the menus and footers and what not. Ideally I would accomplish this task using basic unix tools like sed. Since it's not XML I can't use xmlstarlet. Could anyone please suggest recipes, so I can ideally have a script running kill-node.sh 'div class="toplinks"' *.html to prune the bits I don't want. Thank you,

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• Webservice or WCF for compactframework.

  - by Tan

  Hi iam making a Windows mobile application thats connects to an WCF service with basic httpbinding. The mobile device talks directly to the WCF service by tcp. But the performace is really slow. So i tried to switch the mobile device talking to a Webservice (ASMX) then the webservice talks to WCF service. The respone and performace is much faster. Why is it so. Isnt WCF suppose to be faster and have greater performance then the old webservice. please advice and help.

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• Why is VB so popular? [closed]

  - by aaaidan

  To me, Visual Basic seems clumsy, ugly, error-prone, and difficult to read. I'll let others explain why. While VB.net has clearly been a huge leap forward for the language in terms of features, I still don't understand why anyone would choose to code in VB over, say, C#. However, I still see (what seems to be) the vast majority of commercial web apps from "MS shops" are built in VB. I could stand corrected on this, but VB still seems more popular than it deserves. Can anyone help answer any (or all) of these questions: Am I missing something with VB? Is it easier to learn, or "friendlier" than C#? Are there features I don't know about? Why is VB/VB.net so frequently used today, especially in web projects?

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• How to propagate spring security login to EJBs?

  - by tangens

  Context I have a J2EE application running on a JBoss 4.2.3 application server. The application is reachabe through a web interface. The authentication is done with basic authentication. Inside of the EJBs I ask the security context of the bean for the principal (the name of the logged in user) and do some authorization checks if this user is allowed to access this method of the EJB. The EJBs life inside a different ear than the servlets handling the web frontend, so I can't access the spring application context directly. Required change I want to switch to Spring Security for handling the user login. Question How can I propagate the spring login information to the JBoss security context so I can still use my EJBs without having to rewrite them? Ideas and links I already found a page talking about "Propagating Identity from Spring Security to the EJB Layer", but unfortunatelly it refers to an older version of Spring Security (Acegi) and I'm not familiar enough with Spring Security to make this work with the actual version (3.0.2).

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• JAVA Classes in Game programming.

  - by Gabriel A. Zorrilla

  I'm doing a little strategy game to help me learn Java in a fun way. The thing is I visioned the units as objects that would self draw on the game map (using images and buffering) and would react to the mouse actions with listeners attached to them. Now, based on some tutorials I've been reading regarding basic game programming, all seems to be drawn in the Graphics method of my Map class. If a new unit emerges, i just update the Map.Graphics method, it's not as easy as making a new Unit object which would self draw... In this case, I'd be stuck with a whole bunch of Map methods instead of using classes for rendering new things. So my question is, is it possible to use classes for rendering units, interface objects, etc, or i'll have to create methods and just do some kind of structural programming instead of object oriented? I'm a little bit confused and I'd like to have a mental blueprint of how things would be organized. Thanks!

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• l2tp server always 'sent [CCP ResetReq id=0x3]' when got compressed data request

  - by wilbur

  I have built a xl2tpd/ipsec server on my ubuntu 12.04.3, and I managed to make a l2tp vpn connection to the xl2tpd server from my android phone. The xl2tpd log said xl2tpd[10828]: Enabling IPsec SAref processing for L2TP transport mode SAs xl2tpd[10828]: IPsec SAref does not work with L2TP kernel mode yet, enabling forceuserspace=yes xl2tpd[10828]: setsockopt recvref[22]: Protocol not available xl2tpd[10828]: This binary does not support kernel L2TP. xl2tpd[10828]: xl2tpd version xl2tpd-1.2.8 started on atime.me PID:10828 xl2tpd[10828]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc. xl2tpd[10828]: Forked by Scott Balmos and David Stipp, (C) 2001 xl2tpd[10828]: Inherited by Jeff McAdams, (C) 2002 xl2tpd[10828]: Forked again by Xelerance (www.xelerance.com) (C) 2006 xl2tpd[10828]: Listening on IP address 0.0.0.0, port 1701 xl2tpd[10828]: control_finish: Peer requested tunnel 39154 twice, ignoring second one. xl2tpd[10828]: Connection established to 117.136.8.59, 43149. Local: 25339, Remote: 39154 (ref=0/0). LNS session is 'default' However I cannot access the web in my browser. The pppd log said rcvd [Compressed data] 00 1d 82 c4 7c 04 d8 09 ... sent [CCP ResetReq id=0x7] I have googled a lot and found that this was mostly caused by a mppe decompression error. I have disabled BSD-Compress compression with nobsdcomp in /etc/ppp/xl2tpd-options but it did not work. I used openswan-2.6.33 and xl2tpd-1.2.8 which were built from source. And my configurations: /etc/ipsec.conf version 2.0 config setup nat_traversal=yes virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12 oe=off protostack=netkey conn L2TP-PSK-NAT rightsubnet=vhost:%priv also=L2TP-PSK-noNAT conn L2TP-PSK-noNAT authby=secret pfs=no auto=add keyingtries=3 rekey=no ikelifetime=8h keylife=1h type=transport left=106.186.121.214 leftprotoport=17/1701 right=%any rightprotoport=17/%any /etc/xl2tpd/xl2tpd.conf [global] ipsec saref = yes [lns default] local ip = 10.10.11.1 ip range = 10.10.11.2-10.10.11.245 refuse chap = yes refuse pap = yes require authentication = yes ppp debug = yes pppoptfile = /etc/ppp/xl2tpd-options length bit = yes /etc/ppp/xl2tpd-options require-mschap-v2 ms-dns 8.8.8.8 ms-dns 8.8.4.4 asyncmap 0 auth crtscts lock hide-password modem name l2tpd proxyarp lcp-echo-interval 30 lcp-echo-failure 4 debug nobsdcomp Any suggestions? Thanks in advance.

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• SSH: Connection Reset by Peer

  - by hopeless

  I have a Solaris 10 server on another network. I can ping it and telnet to it, but ssh doesn't connect. PuTTY log contains nothing of interest (they both negotiate to ssh v2) and then I get "Event Log: Network error: Software caused connection abort". ssh is defintely running: svcs -a | grep ssh online 12:12:04 svc:/network/ssh:default Here's an extract from the server's /var/adm/messages (anonymised) Jun 8 19:51:05 ******* sshd[26391]: [ID 800047 auth.crit] fatal: Read from socket failed: Connection reset by peer However, if I telnet to the box, I can login to ssh locally. I can also ssh to other (non-Solaris) machines on that network fine so I don't believe that it's a network issue (though, since I'm a few hundred miles away, I can't be sure). The server's firewall is disabled, so that shouldn't be a problem root@******** # svcs -a | grep -i ipf disabled Apr_27 svc:/network/ipfilter:default Any ideas what I should start checking? Update: Based on the feedback below, I've run sshd in debug mode. Here's the client output: $ ssh -vvv root@machine -p 32222 OpenSSH_5.0p1, OpenSSL 0.9.8h 28 May 2008 debug2: ssh_connect: needpriv 0 debug1: Connecting to machine [X.X.X.X] port 32222. debug1: Connection established. debug1: identity file /home/lawrencj/.ssh/identity type -1 debug1: identity file /home/lawrencj/.ssh/id_rsa type -1 debug1: identity file /home/lawrencj/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.1 debug1: no match: Sun_SSH_1.1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.0 debug2: fd 3 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent Read from socket failed: Connection reset by peer And here's the server output: root@machine # /usr/lib/ssh/sshd -d -p 32222 debug1: sshd version Sun_SSH_1.1 debug1: read PEM private key done: type RSA debug1: private host key: #0 type 1 RSA debug1: read PEM private key done: type DSA debug1: private host key: #1 type 2 DSA debug1: Bind to port 32222 on ::. Server listening on :: port 32222. debug1: Bind to port 32222 on 0.0.0.0. Server listening on 0.0.0.0 port 32222. debug1: Server will not fork when running in debugging mode. Connection from 1.2.3.4 port 2652 debug1: Client protocol version 2.0; client software version OpenSSH_5.0 debug1: match: OpenSSH_5.0 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-Sun_SSH_1.1 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible Unknown code 0 ) debug1: SSH2_MSG_KEXINIT sent Read from socket failed: Connection reset by peer debug1: Calling cleanup 0x4584c(0x0) This line seems a likely candidate: debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible

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• Can you help me think of problems for my programming language?

  - by I can't tell you my name.

  I've created an experimental toy programming language with a (now) working interpreter. It is turing-complete and has a pretty low-level instruction set. Even if everything takes four to six times more code and time than in PHP, Python or Ruby I still love programming all kinds of things in it. So I got the "basic" things that are written in many languages working: Hello World Input - Output Countdowns (not as easy as you think as there are no loops) Factorials Array emulation 99 Bottles of Beer (simple, wrong inflection) 99 Bottles of Beer (canonical) Conjatz conjecture Quine (that was a fun one!) Brainf*ck interpreter (To proof turing-completeness, made me happy) So I implemented all of the above examples because: They all used many different aspects of the language They are pretty interesting They don't take hours to write Now my problem is: I've run out of ideas! I don't find any more examples of what problems I could solve using my language. Do you have any programming problems which fit into some of the criteria above for me to work out?

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• Grafting Scala 2.8 into a Netbeans NBAndroid Project...What steps am I missing?

  - by Michael Kohout

  Hi All; Due to Apple's recent T+C hijinks, I've become interested in developing for Android. Anyways, I'm trying to get a mixed-language Android 2.1 project going in Netbeans 6.8 (with the NBAndroid 0.10 plugin). The two languages being Java and Scala(2.8 head build). To give you a basic idea of what the app does right now, it's just a simple "Hello World" app. To get this to build, I've modified the projects's build.xml file: -- -injars ${scala-library}(!META-INF/MANIFEST.MF,!library.properties) -outjars "${build.classes.dir}/classes.min.jar" -libraryjars "${file.reference.android.jar}" -dontwarn -dontoptimize -dontobfuscate -keep public class * extends android.app.Activity -keep public class scala.xml.include.sax.Main** I've gotten the project so that it'll build, but it errors on startup in my Android Emulator(inside the emulator Android tells me my application has stopped unexpectedly). So my questions are: Does anyone see what I may be doing wrong? And is there any way to get access to the logs that the emulator must create? thanks Mike Kohout

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• MSDN Example of handling an exception from the TPL - Is this a race condition?

  - by David

  I'm looking at the TPL exception handling example from MSDN @ http://msdn.microsoft.com/en-us/library/dd537614(v=VS.100).aspx The basic form of the code is: Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); }); try { task1.Wait(); } catch (AggregateException ae) { throw ae.Flatten(); } My question is: Is this a race condition? What happens if task1 throws before the try has executed? Am I missing something that stops this being a race? Shouldn't it be written like this instead: try { Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); }); task1.Wait(); } catch (AggregateException ae) { throw ae.Flatten(); }

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• T-SQL How To: Compare and List Duplicate Entries in a Table

  - by Dan7el

  SQL Server 2000. Single table has a list of users that includes a unique user ID and a non-unique user name. I want to search the table and list out any users that share the same non-unique user name. For example, my table looks like this: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker 2 heroman Joseph (Joey) Carter Jones 3 thehulk Bruce Banner What I want to do is do a SELECT and have the result set be: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker from my table. I'm not a T-SQL guru. I can do the basic joins and such, but I'm thinking there must be an elegant way of doing this. Barring elegance, there must be ANY way of doing this. I appreciate any methods that you can help me with on this topic. Thanks! ---Dan---

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• Mapping A Sphere To A Cube

  - by petrocket

  There is a special way of mapping a cube to a sphere described here: http://mathproofs.blogspot.com/2005/07/mapping-cube-to-sphere.html It is not your basic "normalize the point and your done" approach and gives a much more evenly spaced mapping. I've tried to do the inverse of the mapping going from sphere coords to cube coords and have been unable to come up the working equations. It's a rather complex system of equations with lots of square roots. Any math geniuses want to take a crack at it? Here's the equations in c++ code: sx = x * sqrtf(1.0f - y * y * 0.5f - z * z * 0.5f + y * y * z * z / 3.0f); sy = y * sqrtf(1.0f - z * z * 0.5f - x * x * 0.5f + z * z * x * x / 3.0f); sz = z * sqrtf(1.0f - x * x * 0.5f - y * y * 0.5f + x * x * y * y / 3.0f); sx,sy,sz are the sphere coords and x,y,z are the cube coords.

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• Adding new rows to a jQuery TableSorter with Pager

  - by macca1

  I have a basic table with the jQuery tableSorter on it in addition to a filter and pager: $("#myTable") .tablesorter({ debug: false, widgets: ['zebra'] }) .tablesorterFilter({ filterContainer: $("#filterBoxOne"), filterClearContainer: $("#filterClearOne"), filterColumns: [0, 1, 2], filterCaseSensitive: false }) .tablesorterPager({ container: $("#pagerOne"), positionFixed: false }); I'm trying to dynamically add a whole bunch of rows to it: function addRows() { $("#myTable tbody").append( $("#newRows").html() ); $("#myTable").trigger("update") .trigger("applyWidgets"); //.trigger("appendCache"); //tried this, didn't help } Everything is working fine except for the pager: it doesn't get updated when I add more rows, and upon clicking on one of the buttons (first, next, last, etc), the newly added rows disappear. Is there a way I can remove the pager and re-add it? Or is there some other way to achieve this?

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