On 12 Mar 2009, at 13:22, richard.cot...@hsl.gov.uk wrote:
I'm trying to write a loop to sum my data in the following way:
(the second - the first) + (the third - the second) + (the fourth -
the third) + ...
for each column.
This is just sum(diff(x)), or even x[length(x)] - x[1].
I think rowSums gives what's intended,
rowSums(diff( matrix(c(1,2,3,4,5,6),ncol=2) ))
(but i'd give heads or tails as to whether this was an
oversimplification of the real problem )
baptiste
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