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如何在R中使用xpath表示多个xml属性

[英]How to use xpath for multiple xml attributes in R

 原文  2014-11-01 09:28:04  7   1    xml/ r/ xpath

问题描述

I would like to read some data from a xml file and embed these data into a R script so that I can generate a scatter plot. 我想从xml文件中读取一些数据并将这些数据嵌入到R脚本中，以便生成散点图。 However, the problem is that one tag has several attributes and I do not know how to handle that. 但是，问题是一个标签有几个属性，我不知道如何处理它。 Please can you help me? 你能帮帮我吗？

In the xml file below, I would like to read all results of the VertexConnectivity2, for example. 在下面的xml文件中，我想读取VertexConnectivity2的所有结果，例如。 Maybe my other question and the answers can give you a hint. 也许我的其他问题和答案可以给你一个提示。 

<?xml version="1.0" encoding="UTF-8"?>
<MappingTest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://sourceforge.net/projects/alevin/ ./Alevin.xsd" xmlns="http://sourceforge.net/projects/alevin/" name="AdvSubgraphTestGenerator2">
  <TestGenerator className="tests.generatorTests.AdvSubgraphTestRunner"/>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="7.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="1612.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="1.6851389854194017"/>
    <ScenarioMetric name="EdgeConnectivity2" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.9861088559313271"/>
    <ScenarioMetric name="StochasticMetric2" result="0.7559889069056674"/>
    <ScenarioMetric name="VertexConnectivity0" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="0.6648338346749284"/>
    <ScenarioMetric name="EdgeConnectivity0" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="2.279045304613785"/>
    <ScenarioMetric name="StochasticMetric0" result="0.4505067333055669"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="8.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="846.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="1.741814530894711"/>
    <ScenarioMetric name="EdgeConnectivity2" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="1.0019396461682453"/>
    <ScenarioMetric name="StochasticMetric2" result="0.868390100905683"/>
    <ScenarioMetric name="VertexConnectivity0" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="1.854673959898261"/>
    <ScenarioMetric name="EdgeConnectivity0" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="1.295691487310222"/>
    <ScenarioMetric name="StochasticMetric0" result="0.6805885859898158"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="9.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="609.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.212517958069722"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.08677137867839191"/>
    <ScenarioMetric name="StochasticMetric2" result="1.9927278019276755"/>
    <ScenarioMetric name="VertexConnectivity0" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="1.6370875136672722"/>
    <ScenarioMetric name="EdgeConnectivity0" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="1.8573960873462065"/>
    <ScenarioMetric name="StochasticMetric0" result="1.7266332660325572"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="10.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="578.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.145412191385898"/>
    <ScenarioMetric name="EdgeConnectivity2" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.826946783775961"/>
    <ScenarioMetric name="StochasticMetric2" result="1.8202071941911595"/>
    <ScenarioMetric name="VertexConnectivity0" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="1.5890364574294114"/>
    <ScenarioMetric name="EdgeConnectivity0" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="2.2117994159315804"/>
    <ScenarioMetric name="StochasticMetric0" result="1.1993780131111107"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="11.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="797.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.3954850079335364"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.019578501527560466"/>
    <ScenarioMetric name="StochasticMetric2" result="3.0860109027715414"/>
    <ScenarioMetric name="VertexConnectivity0" result="3.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="1.854555495387745"/>
    <ScenarioMetric name="EdgeConnectivity0" result="3.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="3.584217996538307"/>
    <ScenarioMetric name="StochasticMetric0" result="2.1648172533072234"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="12.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="892.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.4913004237744385"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.7696498939789347"/>
    <ScenarioMetric name="StochasticMetric2" result="2.201723978314626"/>
    <ScenarioMetric name="VertexConnectivity0" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="2.04191205905592"/>
    <ScenarioMetric name="EdgeConnectivity0" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="2.376993537716656"/>
    <ScenarioMetric name="StochasticMetric0" result="3.034262661127799"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="13.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="872.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.047126232292386"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.9952229587725951"/>
    <ScenarioMetric name="StochasticMetric2" result="3.3794406500249257"/>
    <ScenarioMetric name="VertexConnectivity0" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="1.6523543005400327"/>
    <ScenarioMetric name="EdgeConnectivity0" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="3.048441149178422"/>
    <ScenarioMetric name="StochasticMetric0" result="3.133358034963522"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="14.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="891.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="1.987660356945407"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.2484076205543828"/>
    <ScenarioMetric name="StochasticMetric2" result="3.9080988222890496"/>
    <ScenarioMetric name="VertexConnectivity0" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="2.1670218484160566"/>
    <ScenarioMetric name="EdgeConnectivity0" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="3.2472187629267433"/>
    <ScenarioMetric name="StochasticMetric0" result="3.1328785000072386"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="15.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="1162.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.2234619923069414"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.45771183680269933"/>
    <ScenarioMetric name="StochasticMetric2" result="2.9215253413041196"/>
    <ScenarioMetric name="VertexConnectivity0" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="2.054840069986192"/>
    <ScenarioMetric name="EdgeConnectivity0" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="3.442550183039827"/>
    <ScenarioMetric name="StochasticMetric0" result="3.995284651861695"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="16.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="1113.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.0926238844236447"/>
    <ScenarioMetric name="EdgeConnectivity2" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.7808319615152142"/>
    <ScenarioMetric name="StochasticMetric2" result="3.0087947748201787"/>
    <ScenarioMetric name="VertexConnectivity0" result="1.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="2.1883371528470357"/>
    <ScenarioMetric name="EdgeConnectivity0" result="1.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="3.663210710605434"/>
    <ScenarioMetric name="StochasticMetric0" result="2.7728208750298773"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="17.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="2454.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="2.23606797749979"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.0"/>
    <ScenarioMetric name="StochasticMetric2" result="4.143188604518091"/>
    <ScenarioMetric name="VertexConnectivity0" result="4.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="3.2916550003635034"/>
    <ScenarioMetric name="EdgeConnectivity0" result="4.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="2.7605883080698828"/>
    <ScenarioMetric name="StochasticMetric0" result="5.220399731228472"/>
  </ScenarioResult>
  <ScenarioResult>
    <ScenarioParameter name="Waxman_alpha" value="0.4"/>
    <ScenarioParameter name="Waxman_beta" value="0.5"/>
    <ScenarioParameter name="NumVNodesPerNet" value="18.0"/>
    <ScenarioParameter name="NumVNets" value="1.0"/>
    <ScenarioParameter name="SNetSize" value="100.0"/>
    <ScenarioParameter name="Min_BW_Dem" value="10.0"/>
    <ScenarioParameter name="Max_BW_Dem" value="50.0"/>
    <ScenarioParameter name="Min_BW_Res" value="30.0"/>
    <ScenarioParameter name="Max_BW_Res" value="100.0"/>
    <ScenarioParameter name="Min_CPU_Dem" value="10.0"/>
    <ScenarioParameter name="Max_CPU_Dem" value="50.0"/>
    <ScenarioParameter name="Min_CPU_Res" value="30.0"/>
    <ScenarioParameter name="Max_CPU_Res" value="100.0"/>
    <ScenarioParameter name="NumberOfRun" value="1.0"/>
    <ScenarioMetric name="Runtime" result="2516.0"/>
    <ScenarioMetric name="RejectedNetworksNumber" result="0.0"/>
    <ScenarioMetric name="VertexConnectivity2" result="2.0"/>
    <ScenarioMetric name="AlgebraicConnectivity2" result="1.9840593925343335"/>
    <ScenarioMetric name="EdgeConnectivity2" result="2.0"/>
    <ScenarioMetric name="FabianianCoefficient2" result="1.0"/>
    <ScenarioMetric name="SpectralGap2" result="0.3636812390986559"/>
    <ScenarioMetric name="StochasticMetric2" result="4.238514242266579"/>
    <ScenarioMetric name="VertexConnectivity0" result="3.0"/>
    <ScenarioMetric name="AlgebraicConnectivity0" result="2.2503830421805113"/>
    <ScenarioMetric name="EdgeConnectivity0" result="3.0"/>
    <ScenarioMetric name="FabianianCoefficient0" result="1.0"/>
    <ScenarioMetric name="SpectralGap0" result="4.0227880048448625"/>
    <ScenarioMetric name="StochasticMetric0" result="6.649563197244915"/>
  </ScenarioResult>
</MappingTest>

1 个解决方案

解决方案1
 3 已采纳  2014-11-01 09:47:56

You can use xmlGetAttr with name = "result" : 您可以将xmlGetAttr与name = "result" ： 

library(XML)
doc <- xmlParse(xData)
res <- doc['//*[@name = "VertexConnectivity2"]'
    , fun = function(x) xmlGetAttr(x, "result")]
> as.numeric(res)
[1] 1 1 2 1 2 2 2 2 2 1 2 2

or alternative select the result attribute within the xpath: 或者在xpath中选择result属性： 

library(XML)
doc <- xmlParse(xData)
> as.numeric(doc['//*[@name = "VertexConnectivity2"]/@result'])
 [1] 1 1 2 1 2 2 2 2 2 1 2 2

To "select NumVNodesPerNet = "14" so that I only have the value vertexConnectivity2 of NumVNodesPerNet = 14" you can break it down in steps. 要“选择NumVNodesPerNet =”14“以便我只有NumVNodesPerNet = 14的值vertexConnectivity2”，您可以逐步分解它。

  1. Find the nodes with attribute name="NumVNodesPerNet" and that has attribute value="14.0" : 找到属性name="NumVNodesPerNet"且属性value="14.0"的节点：

    //*[@name="NumVNodesPerNet" and @value="14.0"]

  2. From this node go back to the parent: 从此节点返回到父节点：

    /..

  3. From this parent node select the node that has attribute name = "VertexConnectivity2" 从此父节点中选择具有属性name = "VertexConnectivity2"的节点

    /*[@name = "VertexConnectivity2"]

  4. Select the result attribute from our ultimate node 从我们的最终节点中选择结果属性

    /@result

putting it all together we have: 把它们放在一起我们有： 

myXpath <- '//*[@name="NumVNodesPerNet" and @value="14.0"]/../*[@name = "VertexConnectivity2"]/@result'
> as.numeric(doc[myXpath])
[1] 2

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