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• how do I interpret rpart splits on factor variables when building classification trees in R?

  - by artessa

  ie, if the factor variable is Climate, with 4 possible values: Tropical, Arid, Temperate, Snow, and a node in my rpart tree is labeled as "Climate:ab", what is the split?

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• Interrogating Java source code

  - by VibeofBoston

  I have a Java source code that I need to interrogate and apply security policies [for e.g. applying CWE] I have couple of ideas, for starters using AST and then travel thru the tree. Others include using regular expression. Are there any options other than AST or regex that I could use for such process.

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• Are interval, segment, fenwick trees the same?

  - by Luiguis

  Today i listened a lecture about fenwick trees (binary indexed trees) and the teacher says than this tree is a generalization of interval and segment trees, but my implementations of this three data structures are different. Is this afirmation true? and Why?

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• JQuery - .position isn't returning offset relative to parent.

  - by Spines

  I'm using .position to find the offset of where the element is relative to the parent, however it seems to be returning a value that is the offset from some parent up the ancestor tree. I have a button, and its wrapped withing a div and its the only element of that div. The div is floated right. .position is returning a value like {left:780, top:370}, when the true value should be around {left:200, top:0}. I'm using jquery 1.4

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• C++: Saving the class object in archived format which is having char * attributes and read it back f

  - by Manjunath

  Hi all, Assume I have a class class A { char *attr1,*attr2; public: . . . }; How to save the object of this class to file in a binary format and read it back? Thanks.

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• how to work with other base numbers in java?

  - by Senthil

  Guys if the int c=10001; which is a binary value.If i want to process it like multiplying it by 10 how to do that?

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• can i use hadoop cloudera without root access?

  - by in_the_cloud

  a bit of a binary question (okay, not excatly) - but was wondering if one is able to configure cloudera / hadoop to run at the nodes without root shell access to the node computers (although i can setup ssh passwordless login)? appears from their instructions that root access is needed, at yet i found a hadoop wiki which suggest root access might not be needed ? http://wiki.apache.org/nutch/NutchHadoopTutorial

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• Can I use reflection to find the bin/[Configuration] folder in ASP.NET instead of the asp temporary

  - by vfilby

  I have an ASP.NET website and I want to find the /bin/[Configuration] folder to use an external tool. When I use reflection to get calling assemblies location it returns something similar to: C:\Windows\Microsoft.NET\Framework\...\Temporary ASP.NET Files\a1388a5e\...\my.dll Since each dll has its own directory under the temp ASP.NET Files this fails for me. How can I get the location of the binary, not asp.net's temporary cache?

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• C++ code parser/processor library

  - by uray

  is there any library that parse a source code of C++ to produce lets say, call graph, class inheritance tree, flow control, class member list or anything as a ready to use graph or structure in code (not in diagram image). to make it more clear, suppose to generate call graph image, there will be a process like this: ` C++ source -> parser -> intermediate structure -> renderer -> call graph image ^ | [i need this] `

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• Is size_t only in C++ standard or C standard as well?

  - by Crazy Chenz

  Is size_t only in C++ standard or C standard as well? I cannot find a C header in the "/usr/include" tree that defines size_t. If it is not in the C std, is GCC just doing some magic to make things work? Thanks, Chenz

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• Sql Server Management Studio Object Explorer dissapeared - missing - vanished

  - by Felbus

  ok, my Sql Server Management Studio Object Explorer had dissapeared. I know the shortcut F8, and the view-object explorer method.. neither do anything, ive clicked everything on the keyboard, googled around, but nothing.. really need this back, its a massive hassle having to navigate through the summary window without the object explorer tree view! help meeeee...

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• Best JSF framework/library for "conversation state"

  - by stacked

  What do people think is the best JSF framework or library for a saving state longer than request scope (but w/o using session scope) that is backbutton/new window safe -- i.e. you have a "wizard"/multi-page form. For example, MyFaces has the 'SaveState' tag (http://bit.ly/8QHmX5) that allows you to maintain state across pages by saving state in the view's component tree. Any comments on SaveState (pros/cons) or suggestions for any better framework or library for this capability?

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• What folders are commonly used by version control systems?

  - by a_m0d

  I need to know what folder names are commonly used by Version Control systems. Many VCSs will create a hidden folder, usually in the top level of the source tree, to store the information that they use. So far, I only know that Git uses .git/ and SVN uses .svn/. What are the folder names that other popular VCSs use?

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• How to change the title bar of a window in Mac OS X

  - by macdever

  I am trying to change the titlebar of a window in Mac OS X. To be specific I am trying to this with firefox. And I want to draw/put a bitmap on the title bar and also min, max, and close buttons. Also I found this file which might be helpful: http://people.mozilla.com/~chofmann/l10n/tree/mozilla/widget/src/cocoa/nsCocoaWindow.mm I can see that they have the code to do custom shading or color change. Thanks

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• ASP.NET MVC image upload store location (db vs filesystem)

  - by adrin

  I am writing web application using ASP.NET MVC + NHibernate + Postres stack. I wonder if images uploaded should be stored in database as binary blobs or on filesystem (and reference only in db). One advantage of db storage I can think of is easy backup/recovery of all data without reverting to filesystem copy tools. On the other hand I suspect that filesystem access may be faster (but is it especially when dealing with many concurrent requests?) What are your suggestions?

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• How do machine code instructions get transferred to the CPU?

  - by user3711789

  I'm currently investigating what the runtime of different programming languages looks like behind the scenes. For a compiled language like C, people usually give the explanation of "Code is compiled to assembly which is assembled and linked into a binary executable. The executable is then loaded into memory and the CPU interprets it." My question is how does the CPU know where to look for the next instruction to execute? Is it a memory address stored in one of the registers?

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• Resources and tutorials to get started on algorithms

  - by koldfyre

  I'm interested in learning about algorithms, both conceptually and practically, as a beginner. I want to learn about binary search trees and similar. What tutorials and example programs, preferably in Python or Java, will help me?

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• C#: Deal with xml, treeview datagridview and datatables

  - by renulren

  Hi all, I am working on a project that pulls data out of an xml files and also uses a tree-grid combination in order to display the data. For example depending on the selected treeview node, the datagridview will display only the records related to that node. What do you think it would be the appropriate approach in dealing with this? Thanks!

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• GDB disas question about address values

  - by user324994

  I'm working with a binary file that I disas'd in gdb. Right now I'm just examining the return value of a function. 0x08048604 <playGame+78>: ret Is the address shown the address where ret is stored in the function? Or is it just the address of the instruction to return the ret value?

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• File upload-download in its actual format.

  - by ras

  hi, I've to make a code to upload/download a file on remote machine. But when i upload the file new line is not saved as well as it automatically inserts some binary characters. Also I'm not able to save the file in its actual format, I've to save it as "filename.ser". I'm using serialization-deserialization concept of java. Thanks in advance.

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• C# save a file from a HTTP Request

  - by d1k_is

  Im trying to download and save a file from a HttpWebResponse but im having problems saving the file (other than Text Files) properly. I think its something to do with this part: byte[] byteArray = Encoding.UTF8.GetBytes(http.Response.Content); MemoryStream stream = new MemoryStream(byteArray); Text Files work fine with the above code but when I try to save the Content to an Image file it gets corrupted. How do i write this 'string' data to an image file (and other binary files)

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• Create select based on routing, how?

  - by huug

  I am trying to implement navigation like in Tree Based Navigation but based on url's defined in routes.rb (named routes, resources, ...). Is it possible to retreive a collection of all routes defined in routes.rb? So I can use it in a select like this: <%= f.collection_select :url, Route.all, :url, :name %> Tnx!

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• If I never ever use HashSet, should I still implement GetHashCode?

  - by Dimitri C.

  I never need to store objects in a hash table. The reason is twofold: coming up with a good hash function is difficult and error prone. an AVL tree is almost always fast enough, and it merely requires a strict order predicate, which is much easier to implement. The Equals() operation on the other hand is a very frequently used function. Therefore I wonder whether it is necessary to implement GetHashCode (which I never need) when implementing the Equals function (which I often need)?

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• how reference copy is handled in Objective-C?

  - by Cathy

  Object graph [Instance A] tree / \ / \ / \ ↓ ↓ [Instance B] [Instance C] apple bug Question Instance A has to reference copies to Instance B and Instance C. If I retain or release Instance A, which has references to the other two instances, what happens to the various reference counts?

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• Using many mutex locks

  - by hanno

  I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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