First, since you only update the 'ddtd' conditioned on 'value', you
should be able to vectorize removing the loop. I let you figure out
how to do that yourself.
Second, you apply the "$" operator multiple times in the loop that
will definitely add some overhead. It should be faster to extract
'value' and 'ddtd' and work with those instead.
/Henrik
On 1/8/07, Benjamin Dickgiesser <[EMAIL PROTECTED]> wrote:
> Hi,
>
> is it possible to do this operation faster? I am going over 35k data
> entries and this takes quite some time.
>
> for(cnt in 2:length(sdata$date))
> {
>
> if(sdata$value[cnt] < sdata$value[cnt - 1]) {
> sdata$ddtd[cnt] <- sdata$ddtd[cnt - 1] +
> sdata$value[cnt - 1] -
> sdata$value[cnt]
> }
> else sdata$ddtd[cnt] <- 0
>
> }
> return(sdata)
>
> Thank you,
> Benjamin
>
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