[R] filling a vector with a tapply function applied to another vector

Santosh Srinivas santosh.srinivas at gmail.com
Fri Nov 12 09:54:41 CET 2010

You could just create a new data frame with the result and cbind?

On Fri, Nov 12, 2010 at 2:11 PM, albechan <alberto.casetta at satt.biz> wrote:
> I have a data frame with three columns. The first one is filled with factors,
> the second one with numeric values and the third one is an empty vector.
> I need fill the third column with the results of the function
> tapply(secondcolumn,firstcolumn,mean) so that I have for each row of the
> third column the mean of the second column conditional to the factor element
> in the first column.
> Thank you very much for your help.
> Alb
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