ppaarrkk wrote:
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 )
grep(paste("^", a, collapse = "|", sep = ""), b)
Uwe Ligges
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