Re: [Help-glpk] Suggestions to solve the master problem faster in a Branch-and-Price model.

[Andrew Makhorin]

> Please, add the missing information to glpk.pdf as indicated below:

Okay.

> 
> glp_del_rows invalidates the basis factorization.
> glp_del_cols invalidates the basis factorization if the column is basic.

More precisely, any change in the problem object that affects the basis
matrix (adding rows, changing row/column of the constraint matrix, etc.)
invalidates the basis factorization.

> After invalidation of the basis factorization glp_warm_up has to be 
> called before calling glp_simplex.

Not needed--glp_simplex does that automatically, if necessary. However,
if the lp preprocessor is used, glp_simplex does not compute the basis
factorization for the original lp at exit.