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jknowles / merTools

Convenience functions for working with merMod objects from lme4

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REsim not working

fcorowe opened this issue · comments

commented

Hi,

I am running the example in the R documentation for REsim i.e.

require(lme4)
m2 <- lmer(Reaction ~ Days + (Days | Subject), sleepstudy)
re2 <- REsim(m2, 25)

and the output is:

Error in getMethod("solve", signature(a = "CHMfactor", b = "diagonalMatrix")) : 
  no method found for function 'solve' and signature CHMfactor, diagonalMatrix

I ran showMethods(REsim)and produced

Function "REsim":
 <not an S4 generic function>

Any ideas of what is going wrong and I could fix this issue?

Thanks,
Francisco.

commented

Experiencing the same issue. Traced it to this line of the function:
mysim <- arm::sim(merMod, n.sims = n.sims)

which returns the same error:
Error in getMethod("solve", signature(a = "CHMfactor", b = "diagonalMatrix")) : no method found for function 'solve' and signature CHMfactor, diagonalMatrix

commented

Issue fixed by reinstalling the arm package. Perhaps update merTools to include dependency checks?

commented

The arm package is a strict dependency of merTools and should be installed when installing the package. I'm not sure what installation path allows the package to install without the dependency, or it could be an issue with calling the functions from merTools without loading the package first. Either way, we are already doing dependency checks. Thanks for the report!