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dbe
2012 Jul 06
2
Maximum number of patterns and speed in grep
Hi,
I am using R's grep function to find patterns in vectors of strings. The
number of patterns I would like to match is 7,700 (of different sizes). I
noticed that I get an error message when I do the following:
data <- array()
for (j in 1:length(x))
{
array[j] <- length(grep(paste(patterns[1:7700], collapse = "|"), x[j],
value = T))
}
When I break this up into 4 chunks of