Dear R-help members I would like to use the R package goalprog, weighted and lexicographical goal programming and optimization to optimize a location problem. In my model I need a "yes" or "no" decision - in this case, whether to select a site or not - are represented by 1 and 0. Does somebody has experience with this problem and know how this could be done? Thanks for your help in andvance. Best wishes J?rg Altwegg