[R] aplpy recursive function on a list

[Berend Hasselman]

On 25-01-2012, at 19:09, patzoul wrote:

> I have 2 series of data a,b and I would like to calculate a new series which
> is z[t] = z[t-1]*a[t] + b[t] , z[1] = b[1].
> How can I do that without using a loop?

?filter

Berend