TransposeCSVMatrix.java

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import java.io.IOException;
import java.io.FileReader;
import java.io.BufferedReader;
import java.util.ArrayList;
import java.io.*;


public class TransposeCSVMatrix {

        public static void main(String[] args) throws IOException {

                if(args.length<1) {return;}

                
                ArrayList<ArrayList<String>> matrix = new ArrayList<ArrayList<String>>();
                BufferedReader input =  new BufferedReader(new FileReader(args[0]));
                String line="";
                
                
                // fill the matrix
        while (( line = input.readLine()) != null){
                ArrayList<String> row= new ArrayList<String>();
                for(String f : line.split(","))
                        row.add(f);
                matrix.add(row);
        }
                
        String outfile = "transposed.csv";
        if(args.length>1) {outfile=args[1];}
        
        // read the matrix
        PrintWriter out = new PrintWriter(new FileWriter(outfile));

        for(int col=0;col<matrix.get(0).size(); col++) {

                for(int row=0;row<matrix.size();row++) {
                        ArrayList<String> r = matrix.get(row);
                        out.print(r.get(col)+",");
                }
                out.print("\n");
        }
        out.close();
        }

}

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srldb
Author(s): Dominik Jain, Stefan Waldherr, Moritz Tenorth
autogenerated on Fri Jan 11 09:58:30 2013