v3 <- numeric()
v3[v1] <- table(v2)[v1]
Jim
__________________________________________________________
James Holtman "What is the problem you are trying to solve?"
Executive Technical Consultant -- Convergys Labs
[EMAIL PROTECTED]
+1 (513) 723-2929
Federico Calboli
<[EMAIL PROTECTED] To: r-help
<[email protected]>
c.uk> cc:
Sent by: Subject: [R] vectorisation
suggestion
[EMAIL PROTECTED]
ath.ethz.ch
06/20/2005 16:15
Hi All,
I am counting the number of occurrences of the terms listed in one
vector in another vector.
My code runs:
for( i in 1:length(vector3)){
vector3[i] = sum(1*is.element(vector2, vector1[i]))
}
where
vector1 = vector containing the terms whose occurrences I want to count
vector2 = made up of a number of repetitions of all the elements of
vector1
vector3 = a vector of NAs that is meant to get the result of the
counting
My problem is that vector1 is about 60000 terms, and vector2 is
620000... can anyone suggest a faster code than the one I wrote?
Cheers,
Federico Calboli
--
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG
Tel +44 (0)20 75941602 Fax +44 (0)20 75943193
f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com
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