[R] without the loop

[Giovanni Petris]

I won't go into the details of your loop, but in general it is usually
better, if possible, to create a list of the appropriate length
upfront.

Giovanni

> Date: Fri, 13 May 2005 16:58:42 -0400
> From: Omar Lakkis <uofiowa at gmail.com>
> Sender: r-help-bounces at stat.math.ethz.ch
> Precedence: list
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> 
> Can this be re-implemented to run faster (without the loop) ? 
> 
> r <- list()
> n = nrow(prices)
>         for (i in (w+1):n) {                   
>                 window <- prices[(i-w):(i-1),]                              
>                 if (prices[i,]$settle > max(window$high)) r <-
> append(r,  1)
>                 else if (prices[i,]$settle < min(window$low)) r <-
> append(r, -1)
>         }
> 
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 __________________________________________________
[                                                  ]
[ Giovanni Petris                 GPetris at uark.edu ]
[ Department of Mathematical Sciences              ]
[ University of Arkansas - Fayetteville, AR 72701  ]
[ Ph: (479) 575-6324, 575-8630 (fax)               ]
[ http://definetti.uark.edu/~gpetris/              ]
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