[Coin-lpsolver] assertion "fabs(dualOut_)<1.0e50" failed in Clp

[Jean-Sebastien Roy]

Hi !

I tried to solve the attached "test.mps" problem with Clp 
# clp -
Clp: import test.mps
Clp: dualS

and got an error. Here is the log :

Switching to line mode
Clp:import test.mps
Coin0001I At line 7 NAME          PROBLEM
Coin0001I At line 8 ROWS
Coin0001I At line 20 COLUMNS
Coin0001I At line 37 RHS
Coin0001I At line 43 BOUNDS
Coin0001I At line 45 ENDATA
Coin0002I Problem PROBLEM has 10 rows, 11 columns and 20 elements
Clp0027I Model was imported from ./test.mps in 0 seconds
Clp:dualS
Clp1001I Initial range of elements is 1 to 1
Clp1004I Not bothering to scale as good enough
Clp0022I Absolute values of scaled rhs range from 1 to 9, minimum gap
1e+100 Clp0020I Absolute values of scaled objective range from 1 to 7
Clp0005I 0  Objective 0 Dual infeas 0.0699999 (1) without free dual
infeas (0) assertion "fabs(dualOut_)<1.0e50" failed: file
"ClpSimplexDual.cpp", line 785 Abort trap (core dumped)

Using "primalS", I got the correct solution (-21).

Depending on how I formulate the problem, I also happen to get wrong
optimums (0.0 sometimes : see test2.mps).

It may very well be a problem with my setup (FreeBSD, latest version of
Clp) and not with Clp. But I tried on another machine AIX with gcc,
with version: ftp://www-126.ibm.com/pub/coin/COIN_2003Aug10.tgz of Clp,
and got the same error.

Maybe there is something wrong with the mps files ?
Both files works well with xpress & glpk.

Regards,

js
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