On Dec 11, 2012, at 6:42 AM, email wrote:
Hi:
I am trying to search PubMed abstracts which contains BOTH two terms:
COL4A1 AND Ocular. I am using the following code:
url= "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?";
search = paste(url,
"db=pubmed&term=COL4A1+AND+Ocular[abstract]&retmax=300", sep="")
docId <- xmlTreeParse(getURL(paste(url, search, sep="")),
useInternalNodes=TRUE)
I want to get the reply where BOTH the terms exist in abstract. But
it is
not doing that now. Any idea?
When I first load packages XML and RCurl, a step which you did not
mention, and then use the "search" url that was constructed by that
paste operation in a browser I get an XML output suggesting successful
construction of a valid search. Checking against an ordinary search it
appears that you were successful in forming a proper conjunction in
the Pubmed search syntax.
I then wondered what your problem really was. You never really stated
whether you were experiencing errors or not getting the correct Pubmed
IDs or were having difficulties understanding the output.
--
David Winsemius, MD
Alameda, CA, USA
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