I want to answer questions about data in Erlang: count things, correlate messages, provide arbitrary statistics. I had thought about resorting to Hadoop for this but is it possible to build a solution in raw Erlang to do rather arbitrary data analysis not necessarily via map/reduce but somehow? I have seen some hints of people doing t...
Does hitting the back button in a web browser cause the session data set in the preceding call to be deleted? ...
Is there any reason why I should pick JSON over XML, or vice-versa if both are available? Tips for optimizing performance when dealing with data feeds are also appreciated! ...
I have this current problem with data i have to represent in a MySQL database: I have to support different kinds of products with different data each one, for example, cars, hotel rooms, books, etc. For my application there is some data which is common for each product, like name, description, price, etc. So I think of having a produc...
I want to be able to get a list of all differences between two JavaScript object graphs, with the property names and values where the deltas occur. For what it is worth, these objects are usually retrieved from the server as JSON and typically are no more than a handful of layers deep (i.e. it may be an array of objects that themselves...
I receive an error message when exposing an ADO.NET Data Service using an Entity Framework data model that contains an entity (called "Case") with an internal setter on a property. If I modify the setter to be public (using the entity designer), the data services works fine. I don’t need the entity "Case" exposed in the data service, so...
What is the difference between a Hash Map and dictionary ADT. And when to prefer one over another. For my programming assignment my instructor has asked to use one of them but I don't see any difference in between both. The program is supposed to work with a huge no. of strings. Any suggestions? ...
I am just beginning to write an application. Part of what it needs to do is to run queries on a database of nutritional information. What I have is the USDA's SR21 Datasets in the form of flat delimited ASCII files. What I need is advice. I am looking for the best way to import this data into the app and have it easily and quickly query...
What are the main differences between a Linked List and a BinarySearchTree? Is BST just a way of maintaining a LinkedList? My instructor talked about LinkedList and then BST but did't compare them or didn't say when to prefer one over another. This is probably a dumb question but I'm really confused. I would appreciate if someone can cla...
Can anyone suggest me on what data structure to use for a soundex algorithm program? The language to be used is Java. If anybody has worked on this before in Java. The program should have these features: be able to read about 50,000 words should be able to read a word and return the related words having the same soundex I don't want t...
I can set data in JTable constructor, and then user can change this data when program is running manually(typing from keyboard). But what method should I use in case I want to change data in some column? To change column header I use TableColumn method setHeaderValue. What should I use to set value in JTable cell? ...
How do I pass a value from a child back to the parent form? I have a string that I would like to pass back to the parent. I launched the child using: FormOptions formOptions = new FormOptions(); formOptions.ShowDialog(); Many thanks ...
For large n (see below for how to determine what's large enough), it's safe to treat, by the central limit theorem, the distribution of the sample mean as normal (gaussian) but I'd like a procedure that gives a confidence interval for any n. The way to do that is to use a Student T distribution with n-1 degrees of freedom. So the quest...
We take text/csv like data over long periods (~days) from costly experiments and so file corruption is to be avoided at all costs. Recently, a file was copied from the Explorer in XP whilst the experiment was in progress and the data was partially lost, presumably due to multiple access conflict. What are some good techniques to avoid...
When calling the acceptClient method on a conflict I get the error below. The acceptServer method works just fine - and I am lost... TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.data::ConflictResolver/updateMessageForAcceptClient()[C:\depot\flex\branches\enterprise_corfu_rc\frameworks\pro...
I'm working on a large scale performance critical asp web application with a pretty much denormalized database (lots of data is duplicated across tables for performance reasons). The application is highly performance critical and large. There is almost no sense of any kind of n-tiered design. I can't touch the database, it's carved in st...
Hello I am Tifu, I am using macros in excel 2007 for my work. I am working with many data and I need to sum data from 2 or more rows in the same coloumn according to the same month. However the month column is expressed as date. for example, i have series of data A B 2/10/2008 2 2/10/2008 3 4/10/2008 3 5/11/2008 ...
I am working with a set of data that I have converted to a list of dictionaries For example one item in my list is {'reportDate': u'R20070501', 'idnum': u'1078099', 'columnLabel': u'2005', 'actionDate': u'C20070627', 'data': u'76,000', 'rowLabel': u'Sales of Bananas'} Per request The second item in my list could be: {'reportDat...
I've recently written this with help from SO. Now could someone please tell me how to make it actually log onto the board. It brings up everything just in a non logged in format. import urllib2, re import urllib, re logindata = urllib.urlencode({'username': 'x', 'password': 'y'}) page = urllib2.urlopen("http://www.woarl.com/board/index...
This is not a really technical question but is required for a system I am building. I am after a UK suburb/postcode database. I haven't been able to find this anywhere and wonder if it is available (freely). I know in Australia is is freely downloadable from Australia Post. Also a US suburb/zip database is required as a secondary concern...