[R] Could not find lmer function in {Matrix} package

[Martin Maechler]

>>>>> "SB" == Steve Brady <steven.brady at yale.edu>
>>>>>     on Tue, 19 Jun 2007 11:59:15 -0400 writes:

    SB> I am having trouble calling the lmer function in the {Matrix}  

    SB> package.  I first installed and loaded {Matrix} as follows:

    >> install.packages("Matrix")
    >> library(Matrix)

    SB> The package loaded successfully, however when I attempted to call  
    SB> lmer, I received the following message:

    SB> Error: could not find function "lmer"

    SB> I also tried:

    SB> < ?lmer

    SB> which produced no search results.

And who told you  lmer() was in the Matrix package ?
It's in the lme4 package, and --- conceptually has always been there --
Only for some maintenance convenience (C code shared between
lme4 and Matrix) reasons, lmer() has actually been in the Matrix
package for some time in the past, 
however you were always supposed to say
    
    require(lme4)  or  library(lme4)

to get to lmer.

Regards,
Martin

    SB> I have attempted these actions in both MacOSx R Versions 2.4.1 and  
    SB> 2.5.0.  I have also tried this in Version 2.5.1. beta on a Windows  
    SB> machine.

    SB> Thanks in advance for any suggestions.

    SB> Steve