Forum Discussion
exportprod:is it deterministic?
I am exporting my lp with exportprod. After I do some changes in my model, I am interested in comparing the lp files. Or it seems that from one run to the next one, identical constraints are not writ...
The LP matrix format does not preserve the column ordering. I would suggest that you switch to using MPS format for such comparisons. Similarly, if you wish to output matrices for solver performance tests preferrably use MPS format and also make sure to employ a high precision number format (e.g. if you are outputting the matrix via the 'writeprob' routine of Xpress Optimizer you can use option 'x' for hexadecimal format).
