well %in% is really checking if the element is in the set and is not a
substring operator.
To get the result you want, try
content[grepl(search$signatures, content$urls),]
For multiple operations you could try
sapply(search$signatures, grepl, x=content$urls)
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Jul 13, 2010, at 8:22 AM, Ralf B wrote:
Hi all,
I would like to detect all strings in the vector 'content' that
contain the strings from the vector 'search'. Here a code example:
content <- data.frame(urls=c(
"http://www.google.com/search?source=ig&hl=en&rlz=&=&q=stuff&aq=f&aqi=g10&aql=&oq=&gs_rfai=CrrIS3
",
"http://search.yahoo.com/search;_ylt=Atvki9MVpnxuEcPmXLEWgMqbvZx4?p=stuff&toggle=1
")
)
search <- data.frame(signatures=c("http://www.google.com/search";))
subset(content, search$signatures %in% content$urls)
I am getting an error:
[1] urls
<0 rows> (or 0-length row.names)
What I would like to achieve is the return of
"http://www.google.com/search?source=ig&hl=en&rlz=&=&q=stuff&aq=f&aqi=g10&aql=&oq=&gs_rfai=CrrIS3
".
Is that possible? In practice I would like to run this over 1000s of
strings in 'content' and 100s of strings in 'search'. Could I run into
performance issues with this approach and, if so, are there better
ways?
Best,
Ralf
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