# [R] How to use complicated FUN in apply ?

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Fri Aug 4 13:47:48 CEST 2000

```José Ernesto Jardim <ernesto at ipimar.pt> writes:

> Hi everyone
>
> I'm trying to use
>
> sigma2.mat<-apply(ri.mat,2,'-n/2*log(sum(ri.mat^2)/n)')
>
> but it's not working.
>
> Is it wrong to use that kind of FUN in apply ? or am I doing something
> wrong ?!

Yes and yes... That syntax means that you want to use a function
called "-n/2*log(sum(ri.mat^2)/n)". I think you mean

sigma2.mat<-apply(ri.mat,2, function(x) -n/2*log(sum(x^2)/n) )

(assuming that the variable "n" exists, otherwise you might something
like function(x){n<-length(x); -n/2*log(sum(x^2)/n)} )
--
O__  ---- Peter Dalgaard             Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
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```