structure

If you search for skips lists implemented in Haskell, you won't find many. It is a probabilistic data structure needing a random number generator, meaning that any of these structures would need to run in the IO monad. Are Haskell folks staying away from these data structures because it's not possible to implement them purely? How can Haskell deal with them? A pseudo-random number generator can of course be used outside of IO , by simply storing the current generator value along with the probabilistic pure data structure and updating it when constructing modified versions. The downside to this

Let's say I want to reproduce an example posted on StackOverflow. Some have suggested posters use dput() to help streamline this process or one of the datasets available in the base package . In this case, however, suppose I have only been given the output of the dataframe: > site.data site year peak 1 ALBEN 5 101529.6 2 ALBEN 10 117483.4 3 ALBEN 20 132960.9 8 ALDER 5 6561.3 9 ALDER 10 7897.1 10 ALDER 20 9208.1 15 AMERI 5 43656.5 16 AMERI 10 51475.3 17 AMERI 20 58854.4 Do I have other options besides saving this as a text file and using read.table() ? Shane That's a neat solution. I'm guessing

Is there a lock-free & thread-safe data structure that implements IList? Naturally by lock-free I mean an implementation that makes no use of locking primitives in .NET but rather uses interlocked operations / atomic operations to achieve thread safety... There isn't one, apparently under the concurrent data structures... Has anyone seen one floating around? I've seen a java one implemented in amino-cbbs , called LockFreeVector but nothing for .NET so far. Any ideas? Well, I couldn't find such a class anywhere; so I gave it a shot . The source code for my ConcurrentList<T> class is available

If i have a site where users can upload as many images as they want(think photobucket-like), what is the best way to set up file storage (also, all uploads get a unique random timestamp)? site root --username ----image1.jpg ----image2.jpg ----image3.jpg --anotheruser ----image1.jpg ----image2.jpg ----image3.jpg ... or siteroot --uploads ----image1.jpg ----image2.jpg ----image3.jpg ----image4.jpg ----image6.jpg ... ----image50000.jpg I think the first method is more organized. But i think the second method is standard(keeping all uploads in the same dir), but i wonder if it would be slower when

I've tried on a few different forums and can't seem to get a straight answer, how can I make this function return the struct? If I try 'return newStudent;' I get the error 'No suitable user-defined conversion from studentType to studentType exists.' // Input function studentType newStudent() { struct studentType { string studentID; string firstName; string lastName; string subjectName; string courseGrade; int arrayMarks[4]; double avgMarks; } newStudent; cout << "\nPlease enter student information:\n"; cout << "\nFirst Name: "; cin >> newStudent.firstName; cout << "\nLast Name: "; cin >>

I am writing a C program. I want a variable that I can access as a char but I can also access the specific bits of. I was thinking I could use a union like this... typedef union { unsigned char status; bit bits[8]; }DeviceStatus; but the compiler doesn't like this. Apparently you can't use bits in a structure. So what can I do instead? Sure, but you actually want to use a struct to define the bits like this typedef union { struct { unsigned char bit1 : 1; unsigned char bit2 : 1; unsigned char bit3 : 1; unsigned char bit4 : 1; unsigned char bit5 : 1; unsigned char bit6 : 1; unsigned char bit7 :

Can someone please tell me what are the properties of the datatypes used by the input_event structure? It is defined as follows in the input.h file: struct input_event { struct timeval time; __u16 type; __u16 code; __s32 value; }; but there are no other descriptions! Even googling gave me nothing interesting. The only thing I know is that time gives seconds or miliseconds from epoch and value gives code of pressed button. But even value of value property isn't really clear for me. In my program every keystroke generates six events. Following events are response for pressing ENTER key: type=4