[R] Error in model.frame

[Göran Broström]

I recently ran into the following:

> x <- c(1,2,4,3)
> lm(x ~ 1:length(x))
Error in model.frame(formula, rownames, variables, varnames, extras, extranames,  : 
        variable lengths differ

but

> lm(x ~ c(1:length(x)))

Call:
lm(formula = x ~ c(1:length(x)))

Coefficients:
   (Intercept)  c(1:length(x))  
           0.5             0.8  

and

> identical(1:4, c(1:4))
[1] TRUE

Should I report this as a bug?

Göran
-- 
 Göran Broström                    tel: +46 90 786 5223
 Department of Statistics          fax: +46 90 786 6614
 Umeå University                   http://www.stat.umu.se/egna/gb/
 SE-90187 Umeå, Sweden             e-mail: gb at stat.umu.se