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[Help-glpk] Sorting Vars?

From: Daniel Reckhard
Subject: [Help-glpk] Sorting Vars?
Date: Sat, 09 Feb 2008 16:35:44 +0100
User-agent: Thunderbird (Windows/20071031)

Hello everyone,

after specifying a 3-dimensional array of vars [1] in my model file I am surprised to see that this array appears to be unsorted [2]. That is very annoying as in the C API vars are always referenced by index [3].

So, to calculate a valid index from a given l, p and b [4] the array has to be sorted! Is there any way to do that? Alternatively is there a function which returns the var's index for a given name?

Because if sorting doesn't work and there is no such function I'll have to write it myself. I.e. parse the problem file into a 3 dimensional array in C with the mixed up index number as value. And that's really ugly and time-consuming. :(

[1] var x{l in Line, j in Products, b in 0..Bucket} >= 0;

[2] Excerpt retreived with lpx_print_prob
4 x[1,1,2]
4 x[1,1,3]
10 x[2,1,0]
2 x[2,1,1]
2 x[2,1,2]
2 x[2,1,3]
3 x[1,1,4]

[3] E.g. lpx_set_mat_row needs a one-dimensional index to reference the according variable.

[4] E.g. index = l * P_max * B_max + p * B_max + b;

Thanks for your time,

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