Re: [Jython-users] Using JAMA arrays with Jython. Jython examples

[Simon G. <sga...@cs...>]

I've done a little work on this with the colt distribution and jython..
Not too tricky..
the hardest part is if you want to index by 1 (e.g. matlab)  or 0 (java)..
My end goal is to sort of create a matlab-esque clone for
my specific area... but I agree the applet way is a great way to go.. 
Pieces
of this could be open sourced BSD style if we want to collaborate..
_simon

Alfonso Reyes wrote:
> Steve, 
> maybe there is no need to port NumPy or SciPy to Jython. 
> I have found that Java can surprise us with a vast ocean of mathematical and
> scientific libraries. The only thing we have to do is add them to our
> classpath and done. Well ..., there is some work to do which is the
> "how-to-use" the libraries in the Pythonic manner. That's why I am taking
> the work of "porting" the calls to the Java libraries. I am not actually
> creating a new library - it is more a how-to use that library. 
>
> Regarding the combo IPython+numpy/scipy+matplotlib, yes, it really does its
> work on the engineering calculations and plotting. I worked with and
> researched it for some months. But before starting development of a
> scientific application I saw that the users were more comfortable running
> applets and java applications (clicking on the .jar file or the .jnlp. That
> meant that I had to write the application in Java which I didn't want to do
> after being at the Python universe. So, how to get together the best of both
> worlds: Jython.
>
> To finish, my reasons for parallel and concurrent use of Python and Java
> (=Jython):
>   Python
> - organized, structured and clean syntaxis (the use of indentation was a
> very clever invention).
> - intuitive and natural language: can use it to teach my kids programming
> - can't imagine any other language to teach object oriented programming
> - it's fun to program with it: non-declarative, easier to detect bugs
>
>   Java
> - the swing GUI libraries are a perfect match for Python: they look (and
> work) so Pythonic
> - many, many libraries out there to use
> - lots of engineering and scientific applications we can learn of; lots of
> code
> - front-end familiar and friendly to the use: applets, .jnlp, .jar
> executables
> - liked by IT guys (you know, seem to panic to anything that carries  .exe)
>
>
> Alfonso Reyes
> Houston, TX
> *****************************
>
>
>
> Steve Lianoglou-2 wrote:
>   
>> Hey Alfonso,
>>
>> On Oct 14, 2007, at 8:34 AM, Alfonso Reyes wrote:
>>
>>     
>>> I was feeling the need to exercise my rusty array learnings from  
>>> the university when we used to do this with Pascal and Fortran and  
>>> decided to evaluate the Java array libraries available. One of them  
>>> is JAMA, a very powerful and simple to use matrix manipulation  
>>> package.
>>>       
>> That's pretty neat.  I often wonder if it would be worth it to port  
>> something like NumPy over to Jython w/ one of these java ndarray  
>> backends. I've been using the colt library for some time (http:// 
>> dsd.lbl.gov/~hoschek/colt/) in Java land and find it to be quite nice.
>>
>> Has anybody else found "the need" to undertake a project like this?  
>> (Some googling actually turned up this issue at the Astronomy BOF @  
>> the SciPy conference this year (http://www.google.com/notebook/public/ 
>> 00116375172106219610/BDQGkIwoQzuK738Yi
>> ))
>>
>> I'm not sure if there's a big payoff in doing this, though. The  
>> IPython+numpy/scipy+matplotlib combo is great, but I'm not sure what  
>> you'd get from porting to jython, since its pretty well self  
>> contained in and of itself.
>>
>> Thoughts?
>>
>> -steve
>>
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>
>