xml – R中的数据mashup：“下标越界”

我正在学习R“R中的数据混搭”,我无法在p上获得示例. 5上班.我使用的代码是这样的：

# Install and load RCurl
install.packages("RCurl")
library("RCurl")

# Install and load the XML package
install.packages("XML")
library("XML")

# Download file and parse it
appid<-    'ucVVQzLV34GQR4ppLwbdW6G8cCSZDoCBqAc53NXsWB3gXkmP1I4epLwMxboV.PfADi_2ubr2A7Cg8FO4Z3xVxxujza2FJ    8M-' 
street<-"11408 Bellflower Road" 
RCurl<-paste( 
"http://local.yahooapis.com/MapsService/V1/geocode?appid=",appid,"&street=",URLencode(street),"&city=Cleveland&state=OH",sep="") 
#xmlResult<-xmlTreeParse(requestUrl,isURL=TRUE) 
xmlResult<-xmlTreeParse(getURL(RCurl))

#Print the output
str(xmlResult)

但是当我这样做时,我得不到以下结果：

List of 2
 $doc:List of 3
  ..$file    :List of 2
  .. ..$text   : Named list()
  .. .. ..- attr(*,"class")= chr [1:5] "XMLTextNode" "XMLNode" "RXMLAbstractNode"     "XMLAbstractNode" ...
  .. ..$Message:List of 1
  .. .. ..$text: Named list()
  .. .. .. ..- attr(*,"class")= chr [1:5] "XMLTextNode" "XMLNode" "RXMLAbstractNode"    "XMLAbstractNode" ...
  .. .. ..- attr(*,"class")= chr [1:4] "XMLNode" "RXMLAbstractNode" "XMLAbstractNode"   "oldClass"
  .. ..- attr(*,"class")= chr [1:4] "XMLNode" "RXMLAbstractNode" "XMLAbstractNode"   "oldClass"
  ..$version : Named list()
  .. ..- attr(*,"class")= chr [1:5] "XMLCommentNode" "XMLNode" "RXMLAbstractNode"   "XMLAbstractNode" ...
  ..$children:
Error in x$children[[...]] : subscript out of bounds

我究竟做错了什么？

解决方法

该API已被弃用. Here is the current one.试试这个：

library("RCurl")
library("XML")
appid      <- 'ucVVQzLV34GQR4ppLwbdW6G8cCSZDoCBqAc53NXsWB3gXkmP1I4epLwMxboV.PfADi_2ubr2A7Cg8FO4Z3xVxxujza2FJ    8M-' 
address    <- paste("11408+Bellflower+Road","Cleveland","OH",sep=",+")
urlRequest <- paste("http://where.yahooapis.com/geocode?q=",address,appid=appid,sep = "")
doc <- xmlToList(xmlTreeParse(urlRequest)) # Convert to List
str(doc)

它对我有用.虽然,您可能想检查它是否有正确的地址.没有邮政编码吗？您可能还想查看Google’s Geocoding API.它不再需要恼人的密钥.

List of 7
 $Error       : chr "0"
 $ErrorMessage: chr "No error"
 $Locale      : chr "us_US"
 $Quality     : chr "87"
 $Found       : chr "1"
 $Result      :List of 29
  ..$quality     : chr "87"
  ..$latitude    : chr "41.511326"
  ..$longitude   : chr "-81.605583"
  ..$offsetlat   : chr "41.511230"
  ..$offsetlon   : chr "-81.605453"
  ..$radius      : chr "2900"
  ..$name        : NULL
  ..$line1       : chr "11408 Bellflower Rd"
  ..$line2       : chr "Cleveland,OH  44106"
  ..$line3       : NULL
  ..$line4       : chr "United States"
  ..$house       : chr "11408"
  ..$street      : chr "Bellflower Rd"
  ..$xstreet     : NULL
  ..$unittype    : NULL
  ..$unit        : NULL
  ..$postal      : chr "44106"
  ..$neighborhood: NULL
  ..$city        : chr "Cleveland"
  ..$county      : chr "Cuyahoga County"
  ..$state       : chr "Ohio"
  ..$country     : chr "United States"
  ..$countrycode : chr "US"
  ..$statecode   : chr "OH"
  ..$countycode  : NULL
  ..$uzip        : chr "44106"
  ..$hash        : chr "BFBDCAB96C2CB175"
  ..$woeid       : chr "12776632"
  ..$woetype     : chr "11"
 $.attrs      : Named chr "1.0"
  ..- attr(*,"names")= chr "version"