Re: Q: Recursion on a list
- To: mathgroup at smc.vnet.net
- Subject: [mg28897] Re: Q: Recursion on a list
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 18 May 2001 01:13:01 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <9e02kg$305@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
I assume x[t] mean x[[t]] and not a function call.
xNew=RotateRight[#1*(1.0-#2) @@@ Transpose[{RotateLeft[x],r}]];
xNew[[1]]=1.0;
?
Regards
Jens
msc wrote:
>
> Greetings,
>
> I'm looking for an efficient method (i.e., with the use of an explicit loop)
> for the following problem. I am working with large lists (several thousand
> elements) of data. Denote one such list r. I would like to define a new list
> x such that:
>
> x[0] = 1.0
>
> x[t] = x[t-1]*(1.0 + r[t])
>
> Can anyone suggest an efficient way?
>
> Thanks in advance,
>
> Mark