[R] str() to extract components

[Joerg van den Hoff]

On Tue, Feb 27, 2007 at 03:52:54PM -0000, Simon Pickett wrote:
> Hi,
> 
> I have been dabbling with str() to extract values from outputs such as
> lmer etc and have found it very helpful sometimes.
> 
> but only seem to manage to extract the values when the output is one
> simple table, any more complicated and I'm stumped :-(
> 
> take this example of the extracted coeficients from a lmer analysis...
> 
> using str(coef(lmer(resp3~b$age+b$size+b$pcfat+(1|sex), data=b))) yields
> 
> Formal class 'lmer.coef' [package "Matrix"] with 3 slots
>   ..@ .Data :List of 1
>   .. ..$ :`data.frame': 2 obs. of  4 variables:
>   .. .. ..$ (Intercept): num [1:2] 1.07 1.13
>   .. .. ..$ b$age      : num [1:2] 0.00702 0.00702
>   .. .. ..$ b$size     : num [1:2] 0.0343 0.0343
>   .. .. ..$ b$pcfat    : num [1:2] 0.0451 0.0451
>   ..@ varFac: list()
>   ..@ stdErr: num(0)
> 
> how do I "get inside" the first table to get the value 1.07 for instance?
> 
> Any help much appreciated.
> 
may `unlist' would be enough?