[R] simple data manipulation question

[smu]

for example:

> d = data.frame(gender=c("m","f","unkown"), x=rnorm(300))
> tapply(d$x,d$gender,mean)
           f             m        unkown 
0.0787628409  0.0940534765 -0.0005323276 

regards,
 stefan


On Wed, Dec 09, 2009 at 04:50:37PM -0800, dolar wrote:
> 
> Hi there
> 
> I have a dataframe of a whole lot of variables
> 
> lets say, one of my variables is gender
> how do I simply get an average of all other variables by gender?
> -- 
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