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Are there any websites or blogs with programming challenges specifically for R users?
I don't know of any specifically for R users. But you'll find a good number of R entries on the Project Euler challenge. See this blog, for example:
http://www.theresearchkitchen.com/blog/archives/category/project-euler
I don't know about any specific to R, but there are quite a few questions tagged code-golf, here on Stack Overflow. Many of them are language agnostic, but not all.
Another area of the site that I like to visit are the questions tagged rosetta-stone. Those questions specifically ask for answers from every programming language.
I haven't heard of any, but you could visit some math-oriented challenges, where you can solve problems in any programming language you wish. One I know is http://projecteuler.net
Bah, someone was faster ;). A thing to be added: after you solve a riddle there, you can see others posts on it, many people submit they code, I saw some R code there afair.
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We are searching an open source scrum agile tool which can help us to do the reporting and manage our agile developments.
We need your help to find and choose the best tools
Here is the tool which will help you.
Agilefant.
1.Using this you can add your sprints.
2.You can assign tasks to particular user.
3.You can see the graph according to the hours spent by users.
4.Sprint backlogs also can carry in next sprint.
here is the link http://agilefant.com/
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There are standard ways to implement most of the common funcionalities.
For example it is recommended to use String Buffers when concatenating larger Strings rather than using Concatenating operator.(which I randomly found)
Where can I find a collection of "recommendations" like this to avoid bad coding ?
There are a number of sites for "coding conversions" anyway.
(Googling didn't help.Do you have a better "search string"?)
Have a read through...plenty of useful information. Google's coding standards for C++
these things vary by language; what holds true for one may not for another. you probably should be googling "code smell" rather than "coding standards".
With the help of John Flatness's comment ,relevant Google search string would be "best practices".
some quickly found links for Java best best practices are javapractices.com,
precisejava.com
and for C#
csharphelp.com,codeproject.com
a link about the StringBuffer
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I found this post:
programming a contest based on cupon codes in drupal
I wonder if there is any sort of module that does something like http://www.eversave.com/ or http://www.groupon.com;
Does anybody knows some module(s) that can give me a "head start"?
Maybe a little code clue on how to start?
I really need to make a clone, thanks in advance.
Please see the modules search on drupal.org related to coupons modules. You can go through them and see which one will suit your needs.
http://drupal.org/search/apachesolr_multisitesearch/coupons?filters=ss_meta_type%3Amodule
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Do you know any R packages implementing rough set based methods? I believe the answer is there are no, but maybe I am missing something subtle.
A quick search with Rseek reveals that there was a talk on this subject presented at the useR! 2004 conference. The abstract mentions an R package, however the package does not appear on CRAN or the authors' personal web pages.
Update: as noted by #ManuParra in the comments below, there is now an R package, RoughSets, implementing algorithms for data analysis using rough set theory.
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It's very difficult to find this kind of document online.
I found one in JAVAWORLD, but this one does not cover the jjTree and visitor one.
Does anybody happen to have some links to the tutorials?
Its been a while, but I found this tutorial very helpful
on a previous project. I was able to create a query language
for our application in a few days with basically no previous
experience with javacc.
I've not read it but while looking for the other tutorial I
also found this one.
You can find a bunch of blog posts I've made regarding various JavaCC/JJTree topics on my JavaCC book's web site. There's a bunch of stuff there - using JavaCC to parse binary data, a JavaCC-based syntax highlighter, parsing fixed-width data with JavaCC, etc.
I found an awesome tutorial!!! It starts you off making a simple adder, then calculator. It definitely helps you understand the structure and syntax of JavaCC!
http://www.engr.mun.ca/~theo/JavaCC-Tutorial
There is a list of books, articles and tutorials in the FAQ.
This is the main reason why I didn't end up liking a class that used javacc, even the staff couldn't figure some of the bugs/messages out. It seems anyone would be much better off using something more standard, like flex & bison.