[R] densities from a list with data.frames

[Richard.Cotton at hsl.gov.uk]

> I have a list which consists of data frames (all data frames have the 
same 
> amount and type of columns but different length).
> Now, I'd like to calculate for each data frame in the list the 
> density function 
> of the values of the fist column ($V1).
> 
> This list could be an example:
> 
> l <- list( data.frame(rnorm(100)), data.frame(rnorm(20)), data.
> frame(rnorm(200)) )

If you want to do the same thing to every element of a list, lapply (or 
sapply) is your friend.
Try:

lapply(l, function(x) density(x[,1]))

Regards,
Richie.

Mathematical Sciences Unit
HSL


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