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MathGroup Archive 2001

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Problem: a matrix and a box...

  • To: mathgroup at
  • Subject: [mg27268] Problem: a matrix and a box...
  • From: Bedrosian Baol <Bedrosian at>
  • Date: Sat, 17 Feb 2001 03:30:40 -0500 (EST)
  • Organization: Posted via Supernews,
  • Sender: owner-wri-mathgroup at

this is the problem: I have a n x m matrix (with n and m ~3000 elements or 

a1 a2 a3..
b1 b2 b3..
c1 c2 c3..
. . .
. . .

the algorythm is: compute the summ of the the a1, a2, b1 and b2 elements (a 
''gliding box'' 2x2), shifing the ''box'' for 1 column and repeat the sum of 
the elements (now a2, a3, b2, b3), and so on...
at the and of the first line, the box return on the second line and 

the final resuls would be another matrix like this:

[a1+a2+b1+b2] [a2+a3+b2+b3]...
[b1+b2+c1+c2] [b2+b3+c2+c3]...

I'm not very experienced with Math4: there is a simple and easy way for 
the result?


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