Re: [Help-glpk] inf as RHS of constraint

[Xypron]

Hello Robbie,

we are talking about a patch to the code reading CPLEX LP files. These 
files are text files. IEEE_754 is only applicable to the binary 
representation.

My patch will translate a right hand side value of a constraint equaling 
either of the strings "inf" and "infinity" to the constant DBL_MAX. 
DBL_MAX is a high and valid number. The GLPK code treats this special 
number internally as infinity in some of the code.

Best regards

Xypron

Robbie Morrison wrote:
> Hello Xypron, hello all
>
> Is this "inf" as a key word or string -- or "inf" as a
> genuine IEEE 754 floating point infinity?
>
>    http://en.wikipedia.org/wiki/IEEE_754
>
> The reason I ask is that I recently fed GLPK a NaN and
> it simply printed a short message and died:
>
>    http://lists.gnu.org/archive/html/bug-glpk/2011-01/msg00001.html
>
> In this regard, might it also be useful if GLPK
> recognized and processed floating point 'inf's ?
>
> Clearly, 'inf's carry more meaning than 'NaN's!
>
> Robbie
>
>
>
>