小编say*_*y69的帖子

运行Ubuntu 12.04.今天终于从2.12升级到2.15.2,当我开始RI得到这个错误.

Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  unable to load shared object '/usr/lib/R/library/stats/libs/stats.so':
  /usr/lib/liblapack.so.3gf: undefined symbol: ATL_chemv
During startup - Warning message:
package ‘stats’ in options("defaultPackages") was not found

编辑:

$ dpkg -l | grep "blas\|atlas"
ii  libatlas3gf-base                               3.8.4-3build1                                 Automatically Tuned Linear Algebra Software, generic shared
ii  libblas-dev                                    1.2.20110419-2ubuntu1                         Basic Linear Algebra Subroutines 3, static library
ii  libblas3gf                                     1.2.20110419-2ubuntu1                         Basic Linear Algebra Reference implementations, shared library
ii  libopenblas-base                               0.1alpha2.2-3                                 Optimized BLAS (linear algebra) library based on GotoBLAS2 …

我正在解析看起来像这样的html:

  <table class="linesTbl">
        <tr class="linesHeader">
            <td><h3>EventName</h3></td>
        </tr><tr class="linesColumns">
            <td>Date</td><td class="contestLine">Description</td>
        </tr><tr class="linesAlt1">
            <td>Time</td><td>X1</td><td>Price1</td>
        </tr><tr class="linesAlt1">
            <td>&nbsp;</td><td>X2</td><td>Price2</td></tr>
</table>

有这样的多个表,所以我试图遍历它们并获取所有数据.我不确定xpath如何在php中处理查询.目前我只是想从每个表中提取EventName.

$doc = new DOMDocument();
@$doc->loadHTML($html);
$xpath = new DOMXPath($doc);

foreach ($xpath->query("//table[@class = 'linesTbl']") as $tableNode){

  $headerTag = $xpath->query(".//h3", $tableNode);
  echo $headerTag->nodeValue;

}

对于$ headerTag查询,我也试过了query("./tr/td/h3", $tableNode).我该怎么做这个相对查询？