On Jan 22, 2010, at 1:58 PM, Fabrice DELENTE wrote:
Try this;
f <- c( 'A', 'B', 'A', 'C', 'B', 'D', 'B')
n <- c('1', '2', '2', '3', '2', '2', '3')
table(paste(f, n))
Thanks for the incredibly fast answer! I'll give this a shot!
Here's another R-way:
> lets<-factor(c( 'A', 'B', 'A', 'C', 'B', 'D', 'B'))
# you did say they were factors, right?
> nums <- factor(c('1', '2', '2', '3', '2', '2', '3'))
> lets=="B"
[1] FALSE TRUE FALSE FALSE TRUE FALSE TRUE
> sum(lets=="B" & nums=="2")
[1] 2
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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