[Coin-osi-devel] loadProblem / default row parameters => different constraints

[Laszlo Ladanyi]

No conscious decision, just what is aesthetically pleasing as default for each
kind. For lb/ub you want symmetry, that's why it's -inf/inf. For sense/rhs
range, a 0 rhs apeals the most. So now we have a discrepancy :-(. 

I think that they should behave the same way. I'd say we should go for >=0,
since that's what happens if rhs is not specified in an MPS file.

--Laci 

On Thu, 26 Jul 2007, Lou Hafer wrote:

> Folks,
> 
> 	While polishing the Osi unitTest, this little anomaly slapped me in the
> face.
> 
> 	There are two versions of loadProblem.  One describes row bounds with an
> upper and lower bound; the other with a sense, rhs, range triplet.  The default
> values specified in the documentation will produce different constraints:
> 
>   lb		-infinity	=>	-inf <= ax <= inf
>   ub		 infinity
> 
>   sense		 'G' ( >= )
>   rhs		 0		=>	ax >= 0
>   range		 0
> 
> This isn't necessarily bad, but I'm wondering if it was a conscious design 
> choice. Does anyone's memory go this far back?
> 
> 							Lou
> 
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