?Reduce

maybe

HTH,

baptiste

2009/9/16 OKB (not okblacke) <brenbarn@brenbarn.net>

>        Is there anything like cumsum and cumprod but which allows you to
> apply an arbitrary function instead of sum and product?  In other words,
> I want a function cumfunc(x, f) that returns a vector, so that for all n
> up to the length of x
>
> cumapply(x,f)[n] = f(x[1:n])
>
> This would give cumsum and cumprod as special cases when f=sum or
> f=prod.
>
>        I could write such a function, but I can't see a way to do it
> without a loop, so I'm wondering if such a function exists that may be
> speedier.
>
> Thanks,
> --
> --OKB (not okblacke)
> Brendan Barnwell
> "Do not follow where the path may lead.  Go, instead, where there is
> no path, and leave a trail."
>        --author unknown
>
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