[R] simple predict question

From: <sms13+_at_pitt.edu>
Date: Wed 01 Jun 2005 - 06:47:53 EST


Excuse the simple question...
I'm not sure what I'm doing wrong with predict, but let me use this example: Suppose I do:
dat<-matrix(c(0,0,10,20),2,byrow=T)
lm1<-lm(dat[,2]~dat[,1])

Suppose I want to generate the linearly-interpolated y-values between the point (0,0) and (0,20) at every unit interval. I thought I just do:
predict(lm1, data.frame(seq(0,10,1))) to get 0,2,4,6...,18,20, but instead
I just get:
1 2
0 20

Any suggestions?

Thanks,
Steven



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