?cumsum
On Fri, 19 Nov 2004, Sean Davis wrote:
I have vector X of length N that I want to have a running sum for (called Y). I just need max(Y). I do this with a "for" loop like so:
Y <- vector(length=N) Y[1] <- X[1] for (i in 2:N) { Y[i] <- Y[i-1]+X[i] } return(max(Y))
Is there a faster way to do this?
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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