[R] vectorizing an iterative process.

[Peter Dalgaard]

Geoffrey Zhu wrote:
> I meant  x[i] <- x[i-1] + y[i-1] and Y[i] <- y[i-1] + x[i] below.
>
> The mailing list software just keep adding 3D's. Sorry. 
>   
Rather, I suspect that *your* mailer is sending in Quoted-Printable, 
without setting the appropriate headers. Take a look at

 http://mail.python.org/pipermail/mailman-users/2003-December/033425.html

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Geoffrey Zhu
> Sent: Tuesday, December 26, 2006 10:03 AM
> To: Richard M. Heiberger; r-help at stat.math.ethz.ch
> Subject: Re: [R] vectorizing an iterative process.
>
> Hi Richard,
>
> 3D is automatically generated by the mailing list software, probably
> because I had ] followed by =3D3D without a space in the original post. 
>
> What I meant was to calculate x[i] =3D3D x[i-1] + y[i-1] 
>
> For example, if X <- 1:10
>
> Then I want the vector Y to be 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, or
> in other words Y[i] =3D3D y[i-1] + x[i]. 
>
> Yes, cumsum does the trick for this. This is what I need. Thanks.
>
> Just curious, do you know how to calculate the more generic x[i] <- f(
> x[i-1], y[i-1] )?
>
> Thanks,
> Geoffrey
>
>
>
> -----Original Message-----
> From: Richard M. Heiberger [mailto:rmh at temple.edu]
> Sent: Tuesday, December 26, 2006 9:56 AM
> To: Geoffrey Zhu; r-help at stat.math.ethz.ch
> Subject: Re: [R] vectorizing an iterative process.
>
>   
>> x[i]=3D3D3Dx[i-1]+y[i-1] for all i, how can I do this without a loop? 
>>     
>
> It looks like
>    x <- cumsum(y)
>
> What does 3D mean?
>
>
>
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