[R] Help me with prediction in linear model

[vijaysheegi]

Hi R-community,
I have the code as follows,i Fitted model as follows
lbeer<-log(beer_monthly)
t<-seq(1956,1995.2,length=length(beer_monthly)) #beer_monthly contains 400+
entries
t2=t^2
beer_fit_parabola=lm(lbeer~t+t2)

Below is not working for me.
Please help me in preparing the new data set for the below prediction



predict(beer_fit_parabola,newdata=data.frame(t=seq(1995,1998,length=20),t2=seq(1995,1998,length=20))

#it is listing all 400+ entries ,but not 20 ahead prediction.

Thanks In advance for your help
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