[Bug-glpk] Re: lpx_write_lp

[Andrew Makhorin]

>Probably
>char *set = "!\"#$%&()/,.;address@hidden'{}|~";   /* may appear in names */
>(line 206 of glplpx.c of GLPK 4.1)
>should be replaced by
>char *set = "!\"#$%&()/,.;address@hidden'{}|~[]";   /* may appear in names */
>
>Otherwise it happens often that original names of columns and rows
>defined in GNU MathProg files can not be written into CPLEX LP files.
>These names often contain "[" and "]" because of indexing.

Unfortunately cplex format does not allow square brackets in symbolic
names. Here is a citation from Appendix E5 of the CPLEX documentation:

   Also, the following characters are not valid in variable names (in
   order to allow for quadratic objective information): ^, *, [ and ].

Besides, names in cplex format cannot be longer than 16 chars while the
MathProg translator can generate much longer names (up to 255 chars).