Oops, what I meant in the example below was:
Given a sequence a[i], i=0,1,2,...,n, and some constant k,
with 0 < k < 1, compute the sequence
b[i] = k*b[i-1] + a[i], i=1,2,...,n
NOT
b[i]= k*a[i-1]+a[i]
Sorry, Jack
P.S. I know it can be done with apply()
Jack Lewis wrote:
> Here is a simple example that I think requires looping,
> (although I'd be thrilled to find out I'm wrong).
> Given a sequence a[i], i=0,1,2,...,n, and some constant k,
> with 0 < k < 1, compute the sequence
> b[i] = k*a[i-1] + a[i], i=1,2,...,n
>
> It may be impossible to state general conditions in S-Plus
> for unavoidable loops, because "avoidance" often just
> means doing the looping with compiled code
> (often internal to S-Plus) from another language
> such as C or Fortran.
> --
> Jack Lewis Redwood Sciences Laboratory
> 707-825-2929 voice Pacific Southwest Research Station
> 707-825-2901 fax USDA Forest Service
> jlewis/psw_rsl@fs.fed.us http://www.rsl.psw.fs.fed.us
>
> NOTE:
> jlewis@rsl.psw.fs.fed.us will be de-activated sometime this summer (1998).
> --------------------------------------------
> Thought must be divided against itself before it can come to any
> knowledge of itself. (Aldous Huxley)
>
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