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MathGroup Archive 2001

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Re: Q: Recursion on a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28902] Re: Q: Recursion on a list
  • From: Ignacio Rodriguez <ignacio at sgirmn.pluri.ucm.es>
  • Date: Fri, 18 May 2001 01:13:05 -0400 (EDT)
  • Organization: UCM
  • References: <9e02kg$305@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

The easiest way seems the use of Do

Do[r[t]=t,{t,0,1000}]
x[0]=1

and then

Do[x[t]=x[t-1](1+r[t]),{t,1,1000}]//Timing

{0.08 Second, Null}

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

--

Ignacio Rodriguez Ramirez de Arellano
Unidad de RMN
Universidad Complutense
Paseo Juan XXIII, 1
Madrid 28040, Spain

Tel. 34-91-394-3288
Fax  34-91-394-3245
e-mail: ignacio at sgirmn.pluri.ucm.es





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