[R-sig-ME] lme4 upgrade broke my old code?

[Ben Bolker]

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On 15-03-17 01:13 PM, marKo wrote:
> On 03/17/2015 05:01 PM, Stuart Luppescu wrote:
>> Hello, I'm trying to update a mer object (here called 
>> crossed.lmer3) created about 2 years ago using lmer of a version
>> I don't remember. I'm now using lme4_1.1-7   Rcpp_0.11.5
>> Matrix_1.1-5 in R version 3.1.2 (2014-10-31) Platform:
>> x86_64-redhat-linux-gnu (64-bit). When I do stuff that worked
>> before, I get errors. E.g.:
>>> crossed.lmer3a <- update(crossed.lmer3, ~ . + cmclsach + 
>>> crclsach)
>> Error: $ operator not defined for this S4 class
> 
>> and summary() gives nothing interesting.
>>> summary(crossed.lmer3)
>> Length  Class   Mode 1    mer     S4
> 
>> Also, code from the examples from the lme4 manual also gives 
>> errors: str(terms(crossed.lmer3)) Error: $ operator not defined 
>> for this S4 class
> 
>> Enter a frame number, or 0 to exit
> 
>> Can I get a little advice here, please?
> 
> 
> I think that starting with version 1, lme4 was not compatible with
> the lower version code. I am afraid that you will have to calculate
> the old models again with the newer lme4.
> 
> Cheers,
> 
> Marko

  There is some help here.  If you install the lme4.0 package (see the
README at https://github.com/lme4/lme4 ) you can at least use
convert_old_lme4() to update lme4 pre 1.0 to lme4.0  ...  We don't
currently have a function to convert stuff that old to modern lme4
(lots of the internal structures have changed), but if you want to
badly enough you can use lme4.0 ...
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