docs: public static void removeEqualRows(DenseMatrix64F matrix)
      {
          int rows = matrix.numRows;
          if (rows < 2)
          {
              return;
          }
          double[] d = matrix.data;
          int cols = matrix.numCols;
          int left = rows-1;
          int delta = 0;
          for (int i=0;i<left;i++)
          {
              int j=i;
              for (;j<left && eq(d, i, j+1, cols);j++);
              if (i != j)
              {
                  int cnt = j-i;
                  System.arraycopy(d, cols*j, d, cols*i, cols*(left-j+1));
                  left -= cnt;
                  delta += cnt;
              }
          }
          if (eq(d, 0, rows-1, cols))
          {
              delta++;
          }
          if (delta > 0)
          {
              matrix.reshape(rows-delta, cols, true);
          }
      }