Question

希望这很简单。我有这个XML

"> xmlroot

"<Period>
  <timeInterval>
    <start>2015-10-20T00:00Z</start>
    <end>2015-10-21T00:00Z</end>
  </timeInterval>
  <resolution>PT60M</resolution>
  <Point>
    <position>1</position>
    <price.amount>24.20</price.amount>
  </Point>
  <Point>
    <position>2</position>
    <price.amount>24.28</price.amount>
  </Point>
  <Point>
    <position>3</position>
    <price.amount>24.89</price.amount>
  </Point>
  <Point>
    <position>4</position>
    <price.amount>25.64</price.amount>
  </Point>
  <Point>
    <position>5</position>
    <price.amount>26.36</price.amount>
  </Point>
  <Point>
    <position>6</position>
    <price.amount>27.83</price.amount>
  </Point>
  <Point>
    <position>7</position>
    <price.amount>28.88</price.amount>
  </Point>
  <Point>
    <position>8</position>
    <price.amount>29.96</price.amount>
  </Point>
  <Point>
    <position>9</position>
    <price.amount>28.73</price.amount>
  </Point>
  <Point>
    <position>10</position>
    <price.amount>28.09</price.amount>
  </Point>
  <Point>
    <position>11</position>
    <price.amount>27.54</price.amount>
  </Point>
  <Point>
    <position>12</position>
    <price.amount>27.52</price.amount>
  </Point>
  <Point>
    <position>13</position>
    <price.amount>27.35</price.amount>
  </Point>
  <Point>
    <position>14</position>
    <price.amount>27.18</price.amount>
  </Point>
  <Point>
    <position>15</position>
    <price.amount>27.04</price.amount>
  </Point>
  <Point>
    <position>16</position>
    <price.amount>27.39</price.amount>
  </Point>
  <Point>
    <position>17</position>
    <price.amount>27.17</price.amount>
  </Point>
  <Point>
    <position>18</position>
    <price.amount>27.23</price.amount>
  </Point>
  <Point>
    <position>19</position>
    <price.amount>27.16</price.amount>
  </Point>
  <Point>
    <position>20</position>
    <price.amount>25.77</price.amount>
  </Point>
  <Point>
    <position>21</position>
    <price.amount>24.80</price.amount>
  </Point>
  <Point>
    <position>22</position>
    <price.amount>24.08</price.amount>
  </Point>
  <Point>
    <position>23</position>
    <price.amount>23.77</price.amount>
  </Point>
  <Point>
    <position>24</position>
    <price.amount>23.64</price.amount>
  </Point>
</Period> "

我在R：getNodeSet(doc = xmlroot,path = 'Period/Point')

中传递此命令

得到这个结果：

list()
attr(,"class")
[1] "XMLNodeSet"

我希望能够将这些数据提取到一个简单的数据框架中 - 任何想法？

供参考：

类（xmlroot） [1]＆＃34; XMLInternalElementNode＆＃34; ＆＃34; XMLInternalNode＆＃34; ＆＃34; XMLAbstractNode＆＃34;

Answer 1

使用XPath时，可以指定节点而不使用整个路径，如下所示：“// Point”。查看this关于在R中操作XML文件的精彩教程。

对于您的具体示例，您可以使用：

xmlToDataFrame(getNodeSet(xmlRoot, "//Point"))

返回

   position price.amount
1         1        24.20
2         2        24.28
3         3        24.89
4         4        25.64
5         5        26.36
6         6        27.83

......等等。

R XML getNodeset doensn找不到节点

1 个答案: