On Feb 25, 2010, at 9:02 AM, Dale Steele wrote:
I'm trying to understand the behavior of seq_along in the following
example:
x <- 1:5; sum(x)
y <- 6:10; sum(y)
data <- c(x,y)
S <- sum( data[seq_along(x)] )
S
T <- sum( data[seq_along(y)] )
T
Why is T != sum(y) ?
Look at
seq_along(y)
seq_along returns indices for the purpose of accession of elements, so
it starts with 1 and ends with the length of the object.
Had you asked for sum(data[y[seq_along(y)]]) you might have achieved
your expectation.
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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