[R] Error using lm(z~x+y,data)

[Peter Dalgaard BSA]

tomsv193 at student.liu.se writes:

> Hi!
> 
> I am fitting a plane to a surface:
> 
> This works excellent:
> ---------------------------------
> x<-dataframe[,1]
> y<-dataframe[,2]
> z<-dataframe[,3]
> data<-cbind(x,y,z)
> 
> # Fit plane to surface
> result<-lm(z~x+y,data)
> ---------------------------------
> 
> But I need to rescale the x,y parameters. So:
> -----------------------------
> x<-dataframe[,1]*149
> y<-dataframe[,2]*149
> z<-dataframe[,3]
> data<-cbind(x,y,z)
> 
> # Fit plane to surface
> result<-lm(z~x+y,data)
> ----------------------------------
> 
> And surprisingly this does not work. Error message is:
> 
> Error in eval(attr(formula, "variables"), data, env) : 
>         sys.frame: not that many enclosing functions
> 
> Why does this happen?


I can confirm this, but not understand it. Certainly looks like a bug.


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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