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

[tomsv193@student.liu.se]

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?


kind regards
Tomas Svensson
EVOTEC,Hamburg


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