Java ArrayList to CSV toCsv(ArrayList columnVectors)

Description

to Csv

License

Open Source License

Declaration

public static String toCsv(ArrayList<double[]> columnVectors) 

Method Source Code

//package com.java2s;
/**/* w  w  w . j  av  a 2 s. c  om*/
 * Copyright 2014 Mark Bishop This program is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details: http://www.gnu.org/licenses
 * 
 * The author makes no warranty for the accuracy, completeness, safety, or
 * usefulness of any information provided and does not represent that its use
 * would not infringe privately owned right.
 */

import java.util.ArrayList;

public class Main {
    public static String toCsv(int[] v) {
        int n = v.length;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < n; i++) {
            sb.append(v[i]);
            if (i < n - 1) {
                sb.append(",");
            }
        }
        sb.append("\n");
        return sb.toString();
    }

    public static String toCsv(double[] v) {
        int n = v.length;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < n; i++) {
            sb.append(v[i]);
            sb.append("\n");
        }
        return sb.toString();
    }

    public static String toCsv(ArrayList<double[]> columnVectors) {
        StringBuilder sb = new StringBuilder();
        int n = columnVectors.size();
        int m = columnVectors.get(0).length;

        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                sb.append(columnVectors.get(j)[i]);
                if (j < n - 1) {
                    sb.append(",");
                }
            }
            sb.append("\n");
        }
        return sb.toString();
    }

    public static String toCsv(double[][] A) {
        int m = A.length;
        int n = A[0].length;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                sb.append(A[i][j]);
                if (j < n - 1) {
                    sb.append(",");
                }
            }
            sb.append("\n");
        }
        String result = sb.toString();
        return result;
    }
}

Related

1. ToCSV(ArrayList vals)
2. toCsvRow(ArrayList csvRow)