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• R: How to update a package and keep it from reverting to the original?

  - by John

  I want to upgrade the package ggplot2: library(ggplot2) packageDescription("ggplot2")["Version"] > 0.8.3 But the current version is 0.8.7. I tried update.packages(), which seemed to work OK. But it still returned older version 0.8.3. So I downloaded and installed the package source from Cran, which says 0.8.7 in the download page. I then install it via the GUI menu in R. It returns ** building package indices ... * DONE (ggplot2) I then run: packageDescription("ggplot2")["Version"] > 0.8.3 And still I have the older version! I don't know why this is not working, what's more I had already come across this problem before and solved it (I can't remember exactly what) but now it has gone back to the older version! What's the easiest way to keep packages like this updated automatically and not have them refer back to older packages?

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• Why do C++ streams use char instead of unsigned char?

  - by Johannes Schaub - litb

  I've always wondered why the C++ Standard library has instantiated basic_[io]stream and all its variants using the char type instead of the unsigned char type. char means (depending on whether it is signed or not) you can have overflow and underflow for operations like get(), which will lead to implementation-defined value of the variables involved. Another example is when you want to output a byte, unformatted, to an ostream using its put function. Any ideas? Note: I'm still not really convinced. So if you know the definitive answer, you can still post it indeed.

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• Is there a way to implement an XMPP client or message reciever that can recieve all the messages fro

  - by roberto

  Basically im trying to build a bot that can send a message using one of many accounts out to a user and be able to receive messages to that account it originally used process and do whatever I need it to do. So far I found the JAXL library (http://code.google.com/p/jaxl/) but based on examples it is only able to handle one user at a time. Any suggestions or ideas? thank you in advanced. btw if there is anyway to make the server automatically forward those messages to another program or whatever that works just as well.

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• Can I use/include gsdll32.dll redmonnt.dll (no modifications) in a commercial application for my cli

  - by scriptmaster

  I am not a license expert; however, after a lot of research, I am still struggling to answer the following questions and would like to know if my assumptions are right! Is it legal to include gsdll32.dll and redmonnt.dll in a commercial product? Should I release any source code of the commercial app where I am using this library? Is there a commercial license (a small fee that my client can pay to use these libraries) to GhostScript? What are the alternative solutions?

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• Key Value Observation (ala Cocoa) in GWT ?

  - by user179997

  Hi all, There are these 2 frameworks out there in the same "cloud application" space as GWT: Sproutcore and Cappuccino. Cappuccino is Cocoa for the web, Sproutcore is Cocoa-like and one very central idea in both is Key Value Observation where the framework itself provides the glue to change all dependencies of an object when it changes, and you only have to declare those dependencies. If that was too poorly expressed please see this presentation: http://www.infoq.com/presentations/subelsky-sproutcore-intro Since the pattern reduces the amount of code you type it reduces the number of bugs. Maybe it's too much to ask but I would like to have that and all the benefits of Eclipse/compiler that come with GWT. Is there support for this in GWT, or a library already developed? Or maybe there is support in some of the component libraries for GWT out there? Thanks

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• functor returning 0

  - by Jon

  I've recently started teaching myself the standard template library. I was curious as to why the GetTotal() method in this class is returning 0? ... class Count { public: Count() : total(0){} void operator() (int val){ total += val;} int GetTotal() { return total;} private: int total; }; void main() { set<int> s; Count c; for(int i = 0; i < 10; i++) s.inset(i); for_each(s.begin(), s.end(), c); cout << c.GetTotal() << endl; }

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• C++ Urban Myths

  - by Neil Butterworth

  I'm starting to write an article on what I'm calling "C++ Urban Myths" - that is, ideas and conceptions about C++ that are common but have no actual roots in reality. Some that I've come up with so far are: TR1 is part of standard C++ TR1 (technical Report #1) proposed a whole bunch of changes to C++. Unfortunately, it was never accepted. It is faster to use iterators to access a vector than operator[] Or vice versa. All tests I've carried out indicate the two are nearly identical in performance. The C++ Standard contains something called the STL It doesn't - neither "STL" nor "Standard Template Library" appear in the Standard. I'm wondering if the SO C++ community can come up with any better ones? Ideally, they should be expressible in a single sentence, and not involve any code. Edit: I guess I didn't make it clear enough that I was interested in myths believed by C++ developers, not misconceptions held by non-C++users. Oh well...

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• PHP 5.2.13 thowing errors on AIX

  - by Thumbeti

  Hi All, On AIX 5.3 (TL 5 to 11) in my application I have updated PHP version from 5.2.6 to 5.2.13. Since then, executing php.bin throwing the following errors: =================================================================== PHP Warning: PHP Startup: Unable to load dynamic library '/opt/pdag/lib/extensions/curl.so' - rtld: 0712-001 Symbol zend_wrong_param_count was referenced from module /opt/pdag/lib/extensions/curl.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol _ecalloc was referenced from module /opt/pdag/lib/extensions/curl.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol zend_llist_init was referenced from module /opt/pdag/lib/extensions/curl.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol zend_register_resource was referenced from module /opt/pdag/lib/extensions/curl.so(), but a runtime definition of the symbol was not found. =================================================================== With PHP version 5.2.6, this issue is not there? Anything i am missing here? Thanks & Regards, Thumbeti

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• Detect template presence at compilation time

  - by doublep

  GCC up to 4.5 doesn't have standard C++0x type trait template has_nothrow_move_constructor. I could use it in my package for optimization, but I don't want to rule out one of the common compilers and don't want to overload configuration with symbols like HAVE_STD_HAS_NOTHROW_MOVE_CONSTRUCTOR. Is it somehow possible to use that template if present and just fall back to copying if not present without using any predefined configuration symbols? I also don't want to depend on Boost, since my library is small and doesn't need Boost for any other reasons. In pseudocode, I need something like: template <typename type> struct has_nothrow_move_constructor_robust : public integral_constant <bool, /* if possible */ has_nothrow_move_constructor <type>::value /* otherwise */ false> { }; Since move constructors are only for C++0x anyway, I don't mind using other C++0x features for the above definition, if at all possible.

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• How can you set a time limit for a PowerShell script to run for?

  - by calrain

  I want to set a time limit on a PowerShell (v2) script so it forcibly exits after that time limit has expired. I see in PHP they have commands like set_time_limit and max_execution_time where you can limit how long the script and even a function can execute for. With my script, a do/while loop that is looking at the time isn't appropriate as I am calling an external code library that can just hang for a long time. I want to limit a block of code and only allow it to run for x seconds, after which I will terminate that code block and return a response to the user that the script timed out. I have looked at background jobs but they operate in a different thread so won't have kill rights over the parent thread. Has anyone dealt with this or have a solution? Thanks!

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• Creating a simple wcf service publishing it to my webhotel, and get it to work

  - by H4mm3rHead

  Hi, This seems to be a recurring problem to me. I want to get started doing wcf services. I create a new Wcf Service Library, compile it, and publish it using FTP to my providers webhotel. But its not working. I somehow cant get access. I dont want some fancy security model - i just want to get a hole through to my simple webservice. Seems that its the part when i publish it to my webhotel (in a subdomain) that breaks the webservice - its working perfectly when starting it locally. How to proceed anyone?

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• for (i in xxx) ggplot problem

  - by Andreas

  This is strange - I think? library(ggplot2) tf <- which(sapply(diamonds, is.factor)) diamonds.tf <- diamonds[,tf] So far so good. But next comes the trouble: pl.f <- ggplot(diamonds.tf, aes(x=diamonds.tf[,i]))+ geom_bar()+ xlab(names(diamonds.tf[i])) for (i in 1:ncol(diamonds.tf)) { ggsave(paste("plot.f",i,".png",sep=""), plot=pl.f, height=3.5, width=5.5) } This saves the plots in my working directory - but with the wrong x-label. I think this is strange since calling ggplot directly produces the right plot: i <- 2 ggplot(diamonds, aes(x=diamonds[,i]))+geom_bar()+xlab(names(diamonds)[i]) I don't really know how to describe this as a fitting title - suggestions as to a more descriptive question-title is most welcome. Thanks in advance

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• Datetime comparaison in CAML Query for Sharepoint

  - by Garcia Julien

  Hi, i'm trying to have some item from a sharepoint list, depends on date in a custom column. I've created my query with 2U2 Caml Builder, and that's worked but when I put it in my own code in my webpart, it always return to me all the items od the list. Here is my code: DateTime startDate = new DateTime(Int32.Parse(year), 1, 1); DateTime endDate = new DateTime(Int32.Parse(year), 12, 31); SPQuery q = new SPQuery(); q.Query = "<Query><Where><And><Geq><FieldRef Name='Publicate Date' /><Value IncludeTimeValue='FALSE' Type='DateTime'>" + SPUtility.CreateISO8601DateTimeFromSystemDateTime(startDate) + "</Value></Geq><Leq><FieldRef Name='Publicate_x0020_Date' /><Value IncludeTimeValue='FALSE' Type='DateTime'>" + SPUtility.CreateISO8601DateTimeFromSystemDateTime(endDate) + "</Value></Leq></And></Where></Query>"; SPListItemCollection allItem = library.GetItems(q);

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• Optimizing Dijkstra for dense graph?

  - by Jason

  Is there another way to calculate the shortest path for a near complete graph other than Dijkstra? I have about 8,000 nodes and about 18 million edges. I've gone through the thread "a to b on map" and decided to use Dijkstra. I wrote my script in Perl using the Boost::Graph library. But the result isn't what I expected. It took about 10+ minutes to calculate one shortest path using the call $graph-dijkstra_shortest_path($start_node,$end_node); I understand there are a lot of edges and it may be the reason behind the slow running time. Am I dead in the water? Is there any other way to speed this up?

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• Improved Genetic algorithm for multiknapsack problem

  - by user347918

  Hello guys, Recently i've been improving traditional genetic algorithm for multiknapsack problem. So My Improved Genetic Algorithm is working better then Traditional Genetic Algorithm. I tested. (i used publically available from OR-Library (http://people.brunel.ac.uk/~mastjjb/jeb/orlib/mknapinfo.html) were used to test the GAs.) Does anybody know other improved GA. I wanted to compare with other improved genetic algorithm. Actually i searched in internet. But couldn't find good algorithm to compare.

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• Programming language for fast calculations with big integers

  - by sub

  I'm doing Project Euler problems at the moment and I can solve most of them using my own programming language which uses direct C++ integers (so they are bound to 2^32 on my machine). However, at times there are problems which require me to work with very high numbers, I can't do that with native integers. So I implemented a BigInt library in my language which unfortunately gets extremely slow at times. Is there a programming language suitable for very efficient handling of big numbers? I mean that I want to do the things I could do in other programming languages with it (variables, loops, etc.), but in a faster way. If you have got tips for workarounds of the 2^32 limit in my language/C++/other languages, please tell me too!

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• Move Global.asax to iHttpModule when using ASP.NET MVC

  - by rockinthesixstring

  I have successfully created an iHttpModule to replace my Global.asax file in many Web Forms applications. But in looking at the Global.asax file in my MVC application, the methods are totally different. I'm wondering if it is still possible to create this same thing in an MVC app. I know it's not necessary and the Global.asax works just fine. I suppose I just want to have nothing but the web.config in the root directory of my application. Also, I am putting all of my classes in a separate class library project instead of a folder in my MVC application. Not sure if this makes a difference or not.

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• Determine the lat lngs of markers within a polygon

  - by subh

  I have a google maps app which plots markers as it loads. One of the new requirment is to to add a Polygon overlay encompassing a selection of markers by the user. I was able to achieve that using the Geometry Controls of the GMaps Utility Library Now, the next step is to form a group of the selected markers for which I would need to determine if the lat lngs of the markers falls within the lat lngs of the polygon? Is there a way to determine the lat lngs of a polygon and compute if the marker's lat lng is within its boundaries?

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• MonoDevelop seems to hang (not unresponsive) when building csprojs

  - by Michael Shimmins

  Building a solution from Visual Studio in mono develop seems to have some issues. I'm hoping someone else has experienced this and has some suggestions. The actual dcms process goes pretty quickly, but in between projects it hangs after printing: Building: XXX.YYY.ZZZ (Debug) After a few minutes (been 10 so far on this current run), it jumps to: Performing main compilation... /Library/Frameworks/Mono.framework/Versions/2.10.1/bin/dmcs /noconfig "/... Build complete -- 0 errors, 0 warnings Building: XXX.YYY.ZZZ (Debug) Then hangs again for another few minutes. This is a sln file with 29 csproj projects in it that was originally created in Visual Studio 2010. I'm wondering if there is a better way to set this up - potentially a native MD file format?

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• How to customize Json serialization using Scala and Play Framework?

  - by Jonas

  I would like to serialize some Scala case classes to Json. E.g my case class looks like: case class Item ( id: Int, name: String, price: BigDecimal, created: java.util.Date) and I would like to serialize it to Json like this: {"id":3, "name": "apple", "price": 8.00, "created": 123424434} so I need a custom serilization for BigDecimal and for Date. Where I want the data in milliseconds since 1 jan 1970. When using Scala and Play Framework, I can return Json using Json(myObject), but how do I customize the serialization? Or is there any recommended Scala library?

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• Github svn interface

  - by Fabio

  I recently moved a project on github and I still use this library in some svn projects as external. However I can't get github svn interface working at this time. If I run svn list http://svn.github.com/fabn/zle.git I obtain this error svn: Server sent unexpected return value (500 Internal Server Error) in response to PROPFIND request for '/fabn/zle.git/!svn/bc/0' If I run the same command using a fork of my project the list (and also the checkout) goes fine and i obtain what I need (this is the command svn list http://svn.github.com/JellyBelly/zle.git) Is there anything I can do to resolve this issue or it's a github problem?

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• Captcha Alternative, how secure?

  - by aslum

  I do the web page for my local library, and I was thinking it might be kind of appealing to have a "custom" captcha based on book covers. So serve up one of several dozen book covers, and have the patron filling out the form type the book title to prove they're human. Assuming I stripped the title/author info from the image and filename, would that be enough? Would the fact that it was a unique system on a fairly small website be enough to make it effective? Just how tricky are the spam bots these days? Would having the image name be the ISBN # be too obvious?

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• How can I create masking like this in AS3?

  - by Ólafur Waage

  I've worked a little bit with masks in AS3 but I'm not sure how I can do this with masks. I have two swf files that I have imported onto the Library as MC's with class names. One of the files is the start image and the other is the end image. The transition is a slide transition from the start image to the end image. You can think of the transition like in this example. But is it possible to do a slide transition like this using two swf's and "slide transitioning" between them?

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• SNMP in Java, specifically to be JMX adapter.

  - by Ben

  Hi, I have a few JAVA application that I monitor using JMX. I would like to write an SNMP client for these applications that wraps the JMX interface and by discovery exposes the same attributes that are exposed in JMX, through SNMP. I have no problem writing the client if I just figure out how to write SNMP clients in JAVA. Is there a free SNMP library for JAVA that I can use? Is there a good free SNMP adapter for JMX? (Tried "WebNMS SNMP Adapter for JMX" trial unsuccessfully) Thank you!

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• Optimizing BeautifulSoup (Python) code

  - by user283405

  I have code that uses the BeautifulSoup library for parsing, but it is very slow. The code is written in such a way that threads cannot be used. Can anyone help me with this? I am using BeautifulSoup for parsing and than save into a DB. If I comment out the save statement, it still takes a long time, so there is no problem with the database. def parse(self,text): soup = BeautifulSoup(text) arr = soup.findAll('tbody') for i in range(0,len(arr)-1): data=Data() soup2 = BeautifulSoup(str(arr[i])) arr2 = soup2.findAll('td') c=0 for j in arr2: if str(j).find("<a href=") > 0: data.sourceURL = self.getAttributeValue(str(j),'<a href="') else: if c == 2: data.Hits=j.renderContents() #and few others... c = c+1 data.save() Any suggestions? Note: I already ask this question here but that was closed due to incomplete information.

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