jworkorg's blog

Coding graphs for data mining in Python using Java platform

Graphs belong to the field of mathematics, graph theory. For data analysis that requires searches of particular patterns, graph-based data mining becomes an important technique. Indeed, in real life, most of the data we have to deal with can be represented as graphs. A typical graph consists of vertices (nodes, cells), and of edges that are the connecting lines between the nodes. Analysis of graphs includes determining certain details about the graph structure. For example, determining all routes or the shortest paths between two nodes or cells.

JTerm - Linux commands for Windows?

JTerm is an attempt to mimic Linux/Unix commands using 100% Java. Thus it works on Windows. This project is its infancy, but it is already very useful. For some, it may also look also more attractive than using Cygwin on Windows. First thing to notice - it is only 3M in size, a tiny program compared to the default Cygwin installation. Secondly, it has nice look and feel thanks to Nimbus L&F. In combination with JPort portable Java desktop, it may lead to interesting alternative to Cygwin.

5 best free pograms for statistics, data mining and graphics

R-package - a software for statistical computing written in C. Script oriented. Pros: widely used, simple, extensive documentation. Cons: simpler graphics compared to competitors, no multi-threading, scripting is less powerful compare to other programming languages.

Java is slow? Java can read data faster than C++!

Java can be rather fast! According to the article posted in ArXiv (http://arxiv.org/abs/1311.1229), Java is faster than C++ in reading data (to be exact, data in the ProMC format, which is based on Google's Protocol Buffers). See Table I of this article.

"Small data". Never heard this term?

We often hear the term   "big data" (see "Big data" wikipedia link). Taking the path of finding cool words for description of something quite trivial (before we had "not quite big data", and in 10 years from now we will have "monstrously big data"?), how about a new term "small data"?  The definition of "small data" is less ambiguous than for "big data": Data that has small enough size for human comprehension.

jPort - desktop menu to access free portable Java applications

jPort is finally out (and it is already release 1.4!). What is special about jPort project? jPort is a portable application launcher for Java-enabled platforms (Windows, Linux, Mac). It can launch dozens of free Java-powered programs for office, science, education, code development, entertainment and graphics. If you need a tool to organize all your applications in one place, a single menu (for example, on menuless Windows8) - this is the way to go.

SCaVis. A successor of jHepWork

SCaVis is a successor of jHepWork. Why this change in its name? jHepWork has its origin in high-energy physics (remember, Higgs?). The "Hep" part of jHepWork abbreviates "High-Energy Physics". jHepWork is used in several HEP areas, but it is not very popular in this field since high-energy physics is almost completely based on the ROOT C++ package developed at CERN. The reason is that experimental data are written and stored in the ROOT format.

2011 Open Source Awards by PACKT Publishing

As the name suggests, the award is now opened up to a wider range of Open Source projects. This year’s Award is our most exciting and we’re expecting up to 4 million visits during the Award period. Feel free to check out information about the Awards here. The winner will win a $2,500 prize fund, while the first runner-up will receive $1,000 and the second runner-up $500.

Is java7 faster than java6?


There was recent discussion about Java7 performance for numerical calculations. Few people saw some 20-40% improvement for java7, compare to Java6. This simple script which can be executed in jhepwork shows no such improvement. Run this code above (here I'm using 2 cores) and see it yourself:

Java7 bug (or feature?) on linux

According to the forum  http://jwork.org/jhepwork/forum/viewtopic.php?id=13   just released Java7 has a bug on Linux platform. It seems like execution of the code for jhplot canvases compiled using jdk6 fails.  This bug is perfectly reproducible on the  Linux (Ubuntu, Fedora) and related to the graphics package  org.freehep.graphics2d.VectorGraphics. Interestingly enough, Jdk7 on windows is fine. This bug was sent to the java7 developers, but they could not reproduce it.


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