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From: | Jörg Strebel |
Subject: | [Help-glpk] Gnu Mathprog: Projection operator? |
Date: | Sun, 10 Jan 2010 16:38:28 +0100 |
Hello! In my optimization model, I read data from several .csv-files. This looks as follows: table loaddata IN "CSV" "Exp.csv":L<-[LType, App,Time] table costdata IN "CSV" "disc_data.csv":C<-[Provider,Function, Type] table ressourcedata IN "CSV" "ress_data.csv":R<-[Provider, Server, Size] now I would like to define my variables x{}; they need to feature the indices Provider,Server,Time and App. As I have seen in the example files, the variable gets to be defined using the control sets from the table statement. Unfortunately, I have no control set that directly matches my variable indices. My first thought was to assemble the variable indices using a projection on my existing control sets L,C and R, but I cannot find such an operator in GNU Mathprog. Another option would be to create a .csv-file containing the necessary indices, but that seems a bit complicated. 1. Is there any way a projection can be realized in Mathprog? 2. What is the best way to define the index set for my variable definition? (e.g. creating another .csv-file?) Thank you! Best regards Jörg Strebel Windows Live: Friends get your Flickr, Yelp, and Digg updates when they e-mail you. |
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