From: Min-Han Tan <minhan.science_at_gmail.com>

Date: Thu, 21 Apr 2011 23:34:58 -0400

names(a3) <- c("A","B","C","D")

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 22 Apr 2011 - 03:37:29 GMT

Date: Thu, 21 Apr 2011 23:34:58 -0400

a1 <- c(4,3,4,6,8,9,2,3,4,6,7,4) a2 <- c("A","A","A","A","B","B","C","C","C","D","D","D") a3 <- c(2,4,1,0.5)

names(a3) <- c("A","B","C","D")

I would like the vector (8,6,8,12,32,36,2,3,4,3,3.5,2) as my final output result i.e. multiply each element of a1 by the matching a3 as determined by the corresponding element of a2 - that is, for the first 4 elements of a1, multiply by the value 2 found in a3 ("A"), the next 2 by 4 ("B"), the next 3 by 1.0 ("C"), and the last 3 by 0.5 ("D")

I am trying to avoid the use of loops, because the actual dataset is much larger.

Thanks very much!

Min-Han

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