Perhaps something along the lines of (untested)

t(apply(yourdata[, -1], 2, function(x) diff(log(x))))

is what you are looking for.  See ?apply, ?diff and ?t for more
information.

HTH,
Jorge.-


On Thu, Jul 5, 2012 at 12:58 AM, Akhil dua <> wrote:

> Hello Every one
> I have data on Stock prices and I want to calculate the return on all the
> stocks
> and then replace all the stock prices with the returns
>
> can any one tell me how to do
>
> My data is in the format given below
>
> Date              Stock1  Stock2  Stock3
> 01/01/2000        1          2          3
> 01/02/2000        5          6          7
> 01/03/2000        1          2          3
> 01/04/2000        5          6          7
>
>
> Thanks
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@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.
>

	[[alternative HTML version deleted]]

