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Using grep() to subset lines of text

ppaarrkk 
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[1] = "aaa 2 aaa"
b[2] = "2 aaa"
b[3] = "3 aaa"
b[4] = "aaa 3 aaa"

grep(paste("^",a, sep=""), b )

Thread (6 messages)

ppaarrkk Using grep() to subset lines of text Nov 29 Gabor Grothendieck Using grep() to subset lines of text Nov 29 Stavros Macrakis Using grep() to subset lines of text Nov 29 Gabor Grothendieck Using grep() to subset lines of text Nov 29 Stavros Macrakis Using grep() to subset lines of text Nov 29 Gabor Grothendieck Using grep() to subset lines of text Nov 29