[Help-glpk] lpx_set_col_bnds twice

[Hruby Martin]

Hello,

I solve an optimization problem where I need to specify variables 
(columns) to be in one of possible states:
	1) within an set interval lpx_set_col_bnds(lpx, id, LPX_DB, from, 
to)
        2) zero

Is there a way how to set a column to be in interval <from, to> or zero? 
Thanks for any advice.

Martin