Re: [Help-glpk] lpx_integer() - how to use

[Andrew Makhorin]

> I am not sure I understand it. OK, I first solve the
> simplex problem asuming the variables are real and
> then pass the solution through the LPX pointer to
> lpx_integer. I was wondering why there is this 
> intermediate step why the function could not do it for
> me in one sweep. Unless I misunderstood something.

Yes, firstly you need to obtain optimal basic solution to lp
relaxation using lpx_simplex and then call lpx_integer to obtain
a mip solution. The process is made two-pass in order to allow
the user having alternate ways for specifying optimal basis for lp
relaxation. For example, the user could read an optimal basis from
a file on solving a set of instances with identical lp relaxation.