ILOG CPLEX 11.0 User's Manual

public class Diet {internal class Data {internal int nFoods;internal int nNutrs;internal double[] foodCost;internal double[] foodMin;internal double[] foodMax;internal double[] nutrMin;internal double[] nutrMax;internal double[][] nutrPerFood;internal Data(string filename) {InputDataReader reader = new InputDataReader(filename);foodCost = reader.ReadDoubleArray();foodMin = reader.ReadDoubleArray();foodMax = reader.ReadDoubleArray();nutrMin = reader.ReadDoubleArray();nutrMax = reader.ReadDoubleArray();nutrPerFood = reader.ReadDoubleArrayArray();nFoods = foodMax.Length;nNutrs = nutrMax.Length;}}if ( nFoods != foodMin.Length ||nFoods != foodMax.Length )throw new ILOG.CONCERT.Exception("inconsistent data in file "+ filename);if ( nNutrs != nutrMin.Length ||nNutrs != nutrPerFood.Length )throw new ILOG.CONCERT.Exception("inconsistent data in file "+ filename);for (int i = 0; i < nNutrs; ++i) {if ( nutrPerFood[i].Length != nFoods )throw new ILOG.CONCERT.Exception("inconsistent data in file "+ filename);}The input data of the diet problem is read from a file into an object of the nested classDiet.Data. Its constructor requires a file name as an argument. Using an object of the classInputDataReader, your application reads the data from that file.ModelThis example was chosen because it is simple enough to be viewed by rows as well as bycolumns. Both ways are implemented in the finished application. In this example, eitherperspective can be viewed as natural. Only one approach will seem natural for many models,but there is no general way of deciding which is more appropriate (rows or columns) in aparticular case.100 ILOG CPLEX 11.0 — USER’ S MANUAL