Re: [R] Running sum

[Kjetil Brinchmann Halvorsen]

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?

max(cumsum(Y))

Kjetil

Thanks,
Sean

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--

Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
              --  Mahdi Elmandjra

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