[R] predict problem

[Troels Ring]

Windows 98
R : Copyright 2001, The R Development Core Team
Version 1.2.1 (2001-01-15)
Dear friends.
How comes this works and produce a single prediction:
x <- rnorm(15)
y <- x + rnorm(15)
predict(lm(y ~ x))
new <- data.frame(x = seq(-3, 3, 0.5))
predict(lm(y ~ x), new, se.fit = TRUE)
pred.w.plim <- predict(lm(y ~ x), new, interval="confidence")
new1 <- data.frame(x=3)
predict(lm(y ~ x), new1, interval="confidence")

while this refuses to take the "new" and predict ?
lot <- c(30,20,60,80,40,50,60,30,70,60)
hours <- c(73,50,128,170,87,108,135,69,148,132)
z1 <- lm(hours~lot)
new <- data.frame(x=80)
predict(z1,new,interval="confidence",level=90)
best wishes
Troels 

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