[R] diff in a dataframe

[bartjoosen]

Maybe:
cbind(df,rbind(NA,apply(log(df),2,diff)))


Bart



Vishal Belsare wrote:
> 
> I have a dataframe say:
> 
> date   price_g   price_s
>          0.34        0.56
>          0.36        0.76
>            .              .
>            .              .
>            .              .
> 
> and so on. say, 1000 rows.
> 
> Is it possible to add two columns to this dataframe, by computing say
> diff(log(price_g) and diff(log(price_s)) ?
> 
> The elements in the first row of these columns cannot be computed, but
> can I coerce this to happen and assign a missing value there? It would
> be really great if I could do that, because in this case I don't have
> to re-index my transformed series to the dates again in a new
> dataframe.
> 
> Thanks in anticipation.
> 
> 
> Vishal Belsare
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
> 
> 

-- 
View this message in context: http://www.nabble.com/diff-in-a-dataframe-tp14728790p14731043.html
Sent from the R help mailing list archive at Nabble.com.