[Fwd: Re: [Fwd: Re: JAMA defunct and replaced by Apache Commons-Math?]]

[Ronald Boisvert <boisvert@nist.gov>]

Sender: Anders Peterson <anders@optimatika.se>
Subject: Re: [Fwd: Re: JAMA defunct and replaced by Apache Commons-Math?]


On 19 okt 2009, at 18.53, Ronald Boisvert wrote:

> Another alternative is to use the Java Native Interface (JNI) and  
> link to C or Fortran libraries (seehttp://java.sun.com/developer/onlineTraining/Programming/JDCBook/jniexamp..html 
>  for a quick example of how JNI works). This is a particularly  
> useful option if you are concerned about performance.

Java is not as slow as some people think. (10 years ago it was slow.)  
This is a quote from the netlib-java project page:

"The pure Java implementation is surprisingly fast. A good rule of  
thumb is that native libs only out-perform the Java implementation if  
specific hardware is used or matrices are larger than 1000 x 1000  
elements."

http://code.google.com/p/netlib-java/

.. and then you may add that the Java code in this case may not be  
the best possible. It has been automatically translated from Fortran  
using the F2J tool.

/Anders
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