[R] apply in zoo

Bernd Dittmann herrdittmann at yahoo.co.uk
Sun Dec 30 15:58:41 CET 2007

Hi R users,

could anyone guide me in the right direction reg. the column-wise 
application of a function on a zoo dataframe.

The tseries function sharpe() can only be applied to a univariate time 
series. Suppose you have merged the returns of two assets with 
get.hist.quote(), i.e.

set <- merge(log(ibm), log(ge))

is it possible to apply the function sharpe(), in this case with the 


since I am using weekly close prices

to the dataset "set" column per column?

I tried apply() with no result:

 > apply(set, 2, sharpe(set, scale=sqrt(52)))
Fehler in sharpe(zz) : x is not a vector or univariate time series

In the case of two securities, I could easily do it by hand, but for say 
100 or even 500, I am looking for an automated solution.

Many thanks in advance!


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