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I'm a relatively new convert to Python. I've written some code to grab/graph data from various sources to automate some weekly reports and forecasts. I've been intrigued by the Jython concept, and would like to port some Python code that I've written to Jython. In order to do this quickly, I need a NumPy clone for Jython (or Java). Is there anything like this out there?
I can't find anything that's a clone of numpy, but there's a long list of Java numerics packages here - these should all be usable from Jython. Which one meets your requirements depends on what you're doing with numpy, I guess.
Wilberforce is essentially corrrect.
However, I suggest looking at the Apache Commons Math library -- that would be a better choice for a replacement Java numerics package than any of those listed in wilberforce's answer.
Incanter, a Clojure scientific/statistical computing library, uses the Parallel Colt Java libraries with great success: http://incanter.org/. One route may be to start using the PColt classes in Jython, and slowly build up Python-esque bindings for it, as Incanter provides? (Let me know if you have interest in this.)
There is a build called JNumeric available on sourceforge:
The sourceforge version has not had a release in a long time, but it seems like an updated version for Jython 2.51 is also available (have not tried it myself):
http://bitbucket.org/zornslemon/jnumeric-ra/downloads/
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I am looking for either Opensource or Free Java API for Time Series Analysis using AR, ARIMA etc. I need this api for DDOS Attack analysis.
I googled around and found 2 solutions but both are not completely solving the problem:
1) This same question was asked earlier in stackoverflow and a solution was posted regarding SuanSu Api but this API is not free
2) Apache Math Library, but this API provides other forms of Regression like Simple, OLS, GLS etc but not Auto Regression.
I checked for Options in Machine Learning apis like Mahout but not luck yet. Please suggest an appropiate API
I spent my 4th year Computing project on implementing time series forecasting for Java heap usage prediction using ARIMA, Holt Winters etc, so I might be in a good position to advise you on this.
Your best option by far is using the R language, you can call on the forecasting libraries provided by R, through Java by using the JRI library found here. R is well documented, free and open source. You can even run R on a server and then make calls to it via command line using Rserve, which then returns forecasts over HTTP but JRI is the local equivalent if memory serves me correctly.
If you have any questions, let me know.
Have a look at spark-timeseries. The source code is mostly Scala, but it's relatively simple to use the library from within Java. If you're in a place where you are doing time series analysis on the JVM, then you should consider learning Spark/Scala anyways.
The library is young as of this writing and has room for improvement and growth, but as of version 0.3 it implements AR, ARIMA, simple exponential smoothing (EWMA), and Holt-Winters smoothing. It's areas for improvement are a better automatic ARIMA algorithm, support for seasonal ARIMA, and state space modeling, but it's already very useful.
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i was just wondering if anyone knew of a portable java IDE/Compiler? Something like an iPod but not so advanced, that let's you work with and compile java?
Just thought it would be a cool idea :P
This serves the purpose. We can compile the programs without requiring Java compiler on our machine.
There is an IDE for Android which supports this, see AIDE
Search for drJava. Is a pretty complex editor and includes a(n Eclipse) compiler.
Unfortunatelly, the project seems to be dead.
If you have an iOS device (iPhone, iPod touch or iPad) at hand, you can jailbreak it and install Java from Cydia. This gives you the compiler and the VM. However, it's old and limited to command line functionality.
You can use http://ideone.com/. This is a website for compiling and running java applications Here you can create an account and save all your example programs, which you can later refer from different location or even share it with others.
You can also practice other computer languages in it. It supports more than 40 programming languages.
Have you given any thought about using codenameone platform? http://www.codenameone.com/
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I am currently busy with a project where the main focus of the application is to be extensible (allow 3rd party developers to write plugins / their own implementations of interfaces).
Until now, I have been using Java, and built the application on the NetBeans platform. This has works perfectly fine and is quite easy to implement.
However, the program is quite computationally intense, and must be run on a grid of computers. I think C++ might be better suited for massive computations like I need.
What I would like to know. Is there any libraries like the NetBeans platform for C++. Or would I have to implement everything from scratch (not that I mind, I just wat to know)? Also, how easy is it to write extensible code with C++ and implement something like an update center? This is stuff you get for free with the NetBeans platform. My experience with the using the platform is that it allows you to write very modular code, which is something I like. New modules can be installed independantly, while the platform provides discovery of services to find all the installed plugins / impementations.
Can this be done similarly in C++?
Thanks!
I recommend that you have a look at the Qt framework. They offer a mechanism to create plugins. Have a look at this free online book about Qt. Plugins are discussed in chapter 21.
For modularity on binary level Boost.Extension might be a good choice.
For autoupdate there is for example Google's Omaha (Windows) or Update Engine (OS X)
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I know this question has been asked many times, but here are my specific needs. The obfuscator needs to come in a form of a java library, so I can make an Ant task in order to automate the build process. IE7, 8, Firefox and Chrome must be able to interpret the resulting js very fast (original js file is pretty big - 18k lines of code). If none exist which satisfy these requirements I'm willing to consider a commercial solution.
Some options:
YUI compressor. See Julien Lecomte's blog for example use from Ant.
LCA Soft provide a free Ant task interface to the Dojo Toolkit compressor.
Jawr - Ant task.
(I've not used Jawr or Dojo, so can't comment on which is best.)
Google's closure-compiler is another alternative.
There is a newer free option for Javascript Obfuscation - Roquson. They provide completely free Javascript Obfuscation with additional features like Variable renaming, Domain Locking and Expiration Date.
Check it out here: http://roquson.com
I still believe that jsutility.pjoneil.net provides the best compression of any program available except for gzip. It's obfuscation support is avoids most of the problems with obfuscation. It also now support batch operations.
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I'm wondering if I can access to a Posix Message Queue in Java as I have an application that can't be modified and uses a message queue to talk to other processes.
Is there any api or package that do that?
I know that I can use JNI but I need to do this ASAP so no time to develop that.
Regards.
A bit of Googling found Posix for Java.
Take a look at JNA at GitHub (latest JavaDoc). Quoting the project's description:
JNA provides Java programs easy access
to native shared libraries (DLLs on
Windows) without writing anything but
Java code—no JNI or native code is
required. This functionality is
comparable to Windows' Platform/Invoke
and Python's ctypes. Access is dynamic
at runtime without code generation.
Several projects are using it, including IntelliJ IDEA, Cassandra, and Netbeans.