For me, this works:
> Now, I want to add a 4th column, trend
pricedata$trend <- 0
> which can have 2 values 0 or 1. if return>1%, trend=1 else trend=0.
pricedata$trend <- ifelse( pricedata$return > .01, 1, 0 )
Rgds,
Rainer
On Thursday 21 July 2011 19:39:15 financial engineer wrote:
>
> hi,
>
> Can someone please help me figure out where I am making a mistake in my
> for/if loop:
>
> I have a data frame (112 rows) called pricedata with 3 columns: date, prices,
> return.
>
> Now, I want to add a 4th column, trend, which can have 2 values 0 or 1. if
> return>1%, trend=1 else trend=0.
>
> so, this is what I did:
> >trend<-numeric(nrow(pricedata))
> >cbind(pricedata,trend)
> >for(i in 2:nrow(pricedata)){
> +if (return[i]>0.01) trend[i]=1 else trend[i]=0
> +}
>
> and it doesn't change the values in trend, despite the fact that the return
> column has several rows with values >0.01 -why?
>
> thx!
>
>
>
>
>
> [[alternative HTML version deleted]]
>
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