unexpected behaviour in lm() (PR#3657)

ottk@bms.com writes:

lm(c(1:10) ~ c(1:10))

Call:
lm(formula = c(1:10) ~ c(1:10))

Coefficients:
(Intercept)  
        5.5  

Unexpected: yes, bug: no.

Thing is that the lm logic removes the resonse from the set of
predictors. This is to support stuff like "y ~ .", I believe.

You get the same effect from

x <- c(1:10)
lm(x~x)

Call:
lm(formula = x ~ x)

Coefficients:
(Intercept)
        5.5

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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