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| aquarin |
 Posted: Mon Sep 04, 2006 12:01 pm |
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Joined: 04 Sep 2006
Posts: 1
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| What is the best way to represent Matices (list of lists?) and manipulate them, i.e. multiplication addition etc. |
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| oscarh |
| Posted: Wed Sep 06, 2006 8:19 am |
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Joined: 20 Jul 2006
Posts: 22
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If the size of the matrice is static (or changes are *very* rare) you could use tuples,
Lists however are very convenient to traverse. |
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| michal |
| Posted: Wed Sep 06, 2006 1:20 pm |
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Joined: 20 Jul 2006
Posts: 44
Location: London
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You can take a look at http://dada.perl.it/shootout/matrix.erlang.html
This implementation uses tuple of tuples to represent a matrix. In this case it is quite easy to access an element:
Code: element(Column, element(Row, Matrix))
but as pointed out by Oscarh such a representation can be expensive. Every time you update an element, the whole matrix needs to be recreated. |
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| aquarin2 |
| Posted: Fri Sep 08, 2006 11:44 am |
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Joined: 05 Sep 2006
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| No, the size of matrices is variable. I have created simple module that uses lists to represent matrices. |
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| jay |
| Posted: Sat Sep 09, 2006 4:12 pm |
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Joined: 06 Sep 2006
Posts: 139
Location: Los Angeles, CA USA
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Ulf wrote a user contributed package called "lines". You could have a tuple for each line. His code was designed for accessing each line quickly. You could at least get some ideas from his code.
http://www.erlang.org/user.html |
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