>From the 4.0 release: --------------------------------------------------------------- [linuxserv1] glpk-4.0> ./glpsol -m glpk_mse.mod -o glpk_mse.out Reading model section from glpk_mse.mod... Reading data section from glpk_mse.mod... 698 lines were read Generating obj... Generating Initiallevels1... ... ... Generating D2Flowrate... Model has been successfully generated lpx_simplex: original LP has 258 rows, 280 columns, 986 non-zeros lpx_simplex: presolved LP has 224 rows, 235 columns, 763 non-zeros gm_scal: max / min = 3.024e+10 gm_scal: max / min = 3.141e+03 lpx_adv_basis: size of triangular part = 220 0: objval = 9.994278698e+00 infeas = 1.000000000e+00 (4) 108: objval = 1.904344367e+02 infeas = 1.644014633e-14 (0) * 109: objval = 1.904344367e+02 infeas = 1.364186542e-14 (0) * 162: objval = 2.055253279e+01 infeas = 4.840104012e-13 (0) OPTIMAL SOLUTION FOUND Integer optimization begins... + 162: mip = not found yet; lp = 2.055253279e+01 (1, 0) + 263: mip = 1.897971666e+06; lp = 2.055250491e+01 (6, 13) + 303: mip = 1.236432006e+06; lp = 2.055250491e+01 (7, 16) + 335: mip = 6.870907745e+05; lp = 2.055250491e+01 (8, 19) + 363: mip = 2.736694626e+05; lp = 2.055250491e+01 (7, 22) + 368: mip = 2.131338246e+01; lp = 2.055250491e+01 (6, 25) + 371: mip = 2.131338246e+01; lp = tree is empty (0, 31) INTEGER OPTIMAL SOLUTION FOUND Time used: 0.0 secs Memory used: 0.5M (540068 bytes) lpx_print_mip: writing MIP problem solution to `glpk_mse.out'... ================================================================= >From the 4.1 release: --------------------------------------------------------------- [linuxserv1] glpk-4.1> ./glpsol -m glpk_mse.mod -o glpk_mse.out Reading model section from glpk_mse.mod... Reading data section from glpk_mse.mod... 698 lines were read Generating obj... Generating Initiallevels1... ... ... Generating D2Flowrate... Model has been successfully generated lpx_simplex: original LP has 258 rows, 280 columns, 986 non-zeros lpx_simplex: presolved LP has 224 rows, 235 columns, 763 non-zeros gm_scal: max / min = 3.024e+10 gm_scal: max / min = 3.141e+03 lpx_adv_basis: size of triangular part = 220 0: objval = 1.013061577e+01 infeas = 1.000000000e+00 (0) 148: objval = 1.303831727e+02 infeas = 0.000000000e+00 (0) * 148: objval = 1.303831727e+02 infeas = 0.000000000e+00 (0) * 189: objval = 2.055251404e+01 infeas = 5.026135758e-13 (0) OPTIMAL SOLUTION FOUND Integer optimization begins... + 189: mip = not found yet; lp = 2.055251404e+01 (1, 0) lpx_simplex: numerical instability (dual simplex) lpx_simplex: numerical instability (primal simplex, phase I) Assertion failed: spx->p != 0; file source/glplpx6a.c; line 681 ================================================================= [linuxserv1] glpk-4.1> uname -a Linux linuxserv1 2.4.20-19.8smp #1 SMP Tue Jul 15 15:01:43 EDT 2003 i686 i686 i386 GNU/Linux [linuxserv1] glpk-4.1> gcc -v Reading specs from /opt/local/share2/apps/gcc/bin/../lib/gcc-lib/i686-pc-linux-gnu/3.3.1/specs Configured with: /opt/local/share2/apps/gcc-3.3.1_src/configure --prefix=/opt/local/share2/apps/gcc-3.3.1 Thread model: posix gcc version 3.3.1