If you have COIN installed it has a class called Sparse Matrix which provides the ability to enter, and many functions to manipulate a matrix. It has a function to extract that matrix as pointers to arrays of ia ja ar triplets suitable for use in glp_load_matrix. If you don't want to install COIN, the Sparse Matrix class is seperate code which compiles and functions independantlly of COIN.
-- Nigel Galloway [1][email protected] On Fri, 22 Apr 2011 19:49 +0200, "Pierre Parent" <[email protected]> wrote: Thank you for answering. I do agree that we could think of a lot of ways to represent data and that all of them would not be useful. Though I think the first thing you expect for initilizing a table (such as simplex table), is actually a usual matrix, ie a 2 dimentional table, ie a double pointer ('double **matrix' in my exemple), containing only values, no indices. I think it is not actually a representation of the data among others, it is the most intuitive one. On the other hand, having three 1-dimentional table (2 for indices one for values), as curently done, may be very useful if the matrix has only few values differant from zero; but quite tedious to use in general case. Anyway, in my case adding the other method saved me time. _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk References 1. mailto:[email protected] -- http://www.fastmail.fm - Accessible with your email software or over the web
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