[R] packages masking other objects

From: James Smith <james.smith_at_cdu.edu.au>
Date: Tue 01 Mar 2005 - 13:14:02 EST

hello all,

I am trying to use the function getCovariateFormula(nlme) in conjunction with the library lme4. When I load both packages I get the following message and the getCovariateFormula function no longer works:


Attaching package 'lme4':

        The following object(s) are masked from package:nlme :

         contr.SAS getCovariateFormula getResponseFormula groupedData lmeControl

I have tried removing the package after using it, with: detach(package:lme4)

but I still get an error message when I try to use getCovariateFormula. The line I use it in, and the error message is below:


Error in switch(mode(x), "NULL" = structure(NULL, class = "formula"), :

        invalid formula

This line works fine when I run models with different structures that are not in the lme4 package. Does anyone have any suggestions about this ? Am I not removing the package completely ?

Any suggestions would be greatly appreciated Thanks
James Smith

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