[Help-glpk] Sorting Vars?

[Daniel Reckhard]

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,
--
Daniel