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2011 Jul 05
2
Stuck ...can't get sapply and xmlTreeParse working
...names(new.add) <-
"ParseAddress"
hm <- function(x) {
url.zill
<-paste("http://www.zillow.com/webservice/GetDeepSearchResults.htm?zws-id=X1-ZWz1bup03e49vv_5kvb6&address=",x,
sep="")
############## problem line is next #################################
zdoc <-xmlTreeParse(url.zill, useInternalNode=TRUE, isURL=TRUE)
############# problem line above ##################################
f$zpid <- sapply(getNodeSet(zdoc, "//result/zpid"), xmlValue)
f$zest.low <-sapply(getNodeSet(zdoc, "//valuationRange/low"), xmlValue)...
2011 Jul 10
1
Help with tryCatch
Having a hard time understanding the help files for tryCatch. Looking for a
little help with the following statement which sits inside a for loop
zest[i] <- tryCatch(sapply(getNodeSet(zdoc, "//zestimate/amount"),
xmlValue), error=function() zest[i] <-"NA")
zest is a numeric vector
If the sapply statement evaluates to an error, I'd like to set the value of
zest[i] to NA and continue with the loop.
Suggestions ?
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