R help - Jul 2008 - initialize a matrix

Dear R users,

I'm trying to write a function which returns minimum,maximum,mean of a
vector(power)

I've done the following :
VAR<-function(power,length){
for(i in tml:length)){
tvar[i]<-i
pmean[i]<-mean(power[i:i+deltat])
pmin[i]<-min(power[i:i+deltat])
pmax[i]<-max(power[i:i+deltat])
varmax[i]<-100*(pmax[i]-pmean[i])/pmean[i]
varmin[i]<-100*(pmean[i]-pmin[i])/pmean[i]
Resulats<-list(tvar,pmin,pmax,pmean,varmin,varmax)
}}

p.s. tml is a variable which is grater than 0 , deltat is a constant defined

The problem is that tvar is unknown for R.
So I have to initialize tvar,pmean...
Should I create a zero matrix with length of the vector? And how to do it?

Thanks for help
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I had implemented this

tvar=pmean=pmin=pmax=varmax=varmin<-matrix(data=NA,nrow=n-deltat-tml,ncol=1)

Now the problem I become pmean=pmin=pmax which is not possible!

Any suggestion?

Thanks in advance
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