
thanks Rainer,

it worked!

> From: Rainer.Schuermann@gmx.net
> To: r-help@r-project.org; fin_engr@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!
> > 
> > 
> > 
> > 
> >  		 	   		  
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> > 
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