[R] Using grep() to subset lines of text
simon_ecc at yahoo.co.uk
Sat Nov 29 13:00:43 CET 2008
I have two vectors, a and b. b is a text file. I want to find in b those
elements of a which occur at the beginning of the line in b. I have the
following code, but it only returns a value for the first value in a, but I
want both. Any ideas please.
a = c(2,3)
b = NULL
b = "aaa 2 aaa"
b = "2 aaa"
b = "3 aaa"
b = "aaa 3 aaa"
grep(paste("^",a, sep=""), b )
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