[Cbc] Problem with Cbc trunk

[Horand Gassmann]

Hi,

I have a very strange situation trying to run some tests with Cbc. My  
test problem, p0201.mps solves fine, as long as I do not supply any  
user options. As soon as I add another character to the command line,  
Cbc returns a suboptimal solution, which it obtains without a single  
iteration. I must be missing something obvious, but I have spent all  
afternoon trying to figure it out.

Any ideas?

Thanks

gus


$ ./cbc p0201.mps

...

Result - Optimal solution found

Objective value:                7615.00000000
Enumerated nodes:               34
Total iterations:               6184
Time (CPU seconds):             6.24
Time (Wallclock seconds):       6.32

Total time (CPU seconds):       6.24   (Wallclock seconds):       6.33

$ ./cbc p0201.mps -solution stdout
Welcome to the CBC MILP Solver
Version: Trunk (unstable)
Build Date: Oct 14 2012
Revision Number: 1793

command line - ./cbc p0201.mps -solution stdout (default strategy 1)
At line 15 NAME          P0201
At line 16 ROWS
At line 151 COLUMNS
At line 1270 RHS
At line 1311 BOUNDS
At line 1513 ENDATA
Problem P0201 has 133 rows, 201 columns and 1923 elements
Coin0008I P0201 read with 0 errors
Status unknown - objective value 0.00000000
Total time (CPU seconds):       0.00   (Wallclock seconds):       0.00

$


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Horand I. Gassmann, Professor

Kenneth C. Rowe School of Business, Dalhousie University
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