Meltr - Slashdot User

Submission + - How long did TD Ameritrade know of breach? (computerworld.com)

Submitted by Anonymous Coward on Tuesday September 18, 2007 @10:22AM

An anonymous reader writes: A lawyer who filed a class action lawsuit against TD Ameritrade in May is claiming the company probably knew of the breach much earlier but did not disclose it until it was forced to do so. http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9037083&intsrc=hm_list

Submission + - What is the best java sceintific numerics package?

Submitted by goombah99 on Tuesday September 18, 2007 @09:26AM

goombah99 writes: What's the best high performance numerics and scientific environment library in Java? I've been using Python lately because the numerical lib numpy has some very coherent and easy to use matrix syntax, is quite fast, and there are scientific analysis (scipy) and interactive ploting (pylab) packages built on the same data types as Numpy. However, I'm still not always satisfied with the speed since too often the python glue between the calls to numpy becomes the limiting step. I'm evaluating the possibility of shifting to Groovy+Java. That way I get the dynamic script language rapid development advantage (Groovy) and a seemless ability to hand code some java at any glue language bottlenecks. This is a lot more seamless than say Swig or pyfort.

The problem I'm having is I don't know what's the state of the art in Java Numerical libs, science packages and plotting libs. When I google I get a bewildering list of numerical packages, most of which turn out to have ceased development. With others it's not clear which scientific analysis packages share what underlying numerical libs (and thus would be interoperable). Thus I'm asking slashdot for advice.

I don't require the numerics package be native java (I'm willing to compile the libs for the native processor and use optimized array storage formats if there's more than a factor of 3 in performance boost and it's handled transparently in java). The arrays access should have an easy syntax that permits slicing and functions distributed over array elements in a manner reminiscent of matlab or numpy. I should be able to generate automatically sized and labeled 2 and 3-d plots of data easily without converting data types. And there should be a standard scientific library that includes things like fft, and non-linear solvers. Finally, I need either a non-commercial solution or one whose runtimes I can distribute freely, and it needs to be able to compile on linux and hopefully a mac too. I'd be willing to substitute R or Gnuplot graphics if I can easily call them from inside java without too much data format conversion. Any solution needs to be Groovy compatible or it defeats the purpose. Advice?

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