Rotate double matrix clock-wise or counter-clock-wise

rotate.java

  public static double[][] rotate(double[][] matrix, boolean ccw) {
    double [][] out = new double[matrix[0].length][];
    for (int i = out.length - 1, j = 0; i >= 0 && j < out.length; i--, j++) {
      double[] x = new double[matrix.length];
      out[ccw ? i : j] = x;
      for (int k = x.length, l = 0; k >= 0 && l < x.length; k--, l++) {
        if (ccw) { out[i][l] = matrix[l][j]; }
        else { out[j][l] = matrix[k - 1][j]; }
      }
    }
    return out;
  }