source: branches/ralph/src/main/java/de/ugoe/cs/autoquest/tasktrees/alignment/substitution/TriangleMatrix.java @ 1568

package de.ugoe.cs.autoquest.tasktrees.alignment.substitution;

public class TriangleMatrix {
        
        private double[] matrix;
        private int size;
        
        public TriangleMatrix(int size) {
                this.size = size;
                matrix = new double [size*(size+1)/2];
        }
        
        public double get(int first, int second) {
                int row = Math.min(first, second);
                int col = Math.max(first, second);
                return matrix[row*size-(row*(row+1)/2 - (size-col))];
                
        }
        
        public void set(int first, int second, double value) {
                int row = Math.min(first, second);
                int col = Math.max(first, second);
                matrix[row*size-(row*(row+1)/2 - (size-col))] = value;
        }

        
        
        
        //Note: String just looks good for small. testing matrices 
        public String toString() {
                String result = "";
                for (int i = 0; i < size; i++) {
                        for(int j = 0; j< size; j++) {
                                if(i<j) {
                                        result = result + String.format("%+4.1f",this.get(i,j));
                                }
                                else {
                                        result = result + ("      ");
                                }
                        }
                        result = result + "\n";
                }
                return result;
        }
}