thanks Rainer,
it worked!
> From: rainer.schuerm...@gmx.net
> To: r-help@r-project.org; fin_e...@hotmail.com
> Subject: Re: [R] for/if loop in R
> Date: Fri, 22 Jul 2011 03:23:19 +0200
>
> 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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> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
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