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From: "Nasser M. Abbasi" <nma@12000.org>
Newsgroups: comp.lang.ada
Subject: Re: Any easy/build-in construct to extract submatrices from larger
 matrix?
Date: Mon, 25 Jun 2012 09:21:12 -0500
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Date: 2012-06-25T09:21:12-05:00
List-Id: <comp.lang.ada>

On 6/25/2012 2:54 AM, J-P. Rosen wrote:
> Le 25/06/2012 08:32, Nasser M. Abbasi a �crit :
>> Ada is nice as it strongly typed and catches common errors. But
>> it is not as 'expressive' I am afraid as I'd like for this
>> sort of thing.
>>
>> In Mathematica for example, I do this whole operation in one line:
>>
>> ---------------------------
>> Table[ReplacePart[A,{{i},{i,_},{_,j}}:>Sequence[]],{i,nRow},{j,nCol}];
>> ---------------------------
>>
>> That is all. This generates all submatrices from A as needed
>> in this problem :)


> Right. Now talk about readability... Ada is for long-lived programs, and
> places readability over writability.

Sure. I agree with readability. But do you really think a 40
or 50 lines lines function will be more readable and easier to
understand and maintain than a 1 or 2 lines function?

For me, the above Mathematica one line code is much more readable, and
easier to understand. It uses patterns, yes, but _once_ one understands
the syntax, and how to use patterns, it all becomes so clear, and logical,
and actually easier to maintain and comprehend than a large function
that does the same thing.

btw, I am not even that good in Mathematica. Still learning it. There
are Mathematica experts who would probably write the above in 1/2 the size :)

regards,
--Nasser