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[Help-glpk] Ruby LP Solver issues - "row name too long" for more than 29

From: Lukas Meyer
Subject: [Help-glpk] Ruby LP Solver issues - "row name too long" for more than 29 items
Date: Sat, 18 Jun 2016 15:13:43 +0200

Dear all,

I created a model to solve a linear programming capital budgeting problem with Ruby (OPL):
Maximize NPV of projects (x1…x5) by taking into account Budget and Resource constraints (c1, c2). Solution can only be 0 or 1.
Maximize: 928 x1 + 908 x2 + 801 x3 + 543 x4 + 944 x5
c1: 398 x1 + 151 x2 + 129 x3 + 275 x4 + 291 x5 <= 800
c2: 111 x1 + 139 x2 + 56 x3 + 54 x4 + 123 x5 <= 200
Result is binary (0 or 1): x1 x2 x3 x4 x5

My code works correctly until a certain number of projects (maximum 29). If I use more than 29 Projects (x1 + x2 + .. + x30) the code crashes with the following result:
glp_set_row_name: i = 1; row name too long
Error detected in file glpapi01.c at line 441
Abort trap: 6

Since I would like to process a lot more in order to solve the problem I need to somehow change my setup. I can’t really imagine that this is a given maximum. 

Does anybody have encountered a similar problem and could point me into the right direction? 

Many thanks and best regards,


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