[R-sig-ME] Purpose of .nloptr object?

[Ben Bolker]

    Yes, that's probably it.
   I should look into updating that vignette anyway (it would be good to 
run the machinery and cache some timings to be included in the text).

   cheers
    Ben

On 6/8/21 7:47 PM, Phillip Alday wrote:
> This seems to be the docs getting slightly out of date in some sections
> (as happens with any big piece of software). The actual nloptwrap
> function in lme4 (now the default optimizer, IIRC) doesn't include that:
> 
> https://github.com/lme4/lme4/blob/c3d0c643d444785fad5e554380c028706f14e274/R/utilities.R#L1151-L1169
> 
> A wild guess on my part (until Ben Bolker has a few): that code was
> there to debug writing a wrapper / show how you can further examine the
> return value from nloptr to get more information and got left in, even
> once the further debugging/examination was removed from the example.
> 
> 
> Phillip
> 
> On 08/06/2021 14:19, Michael Chirico via R-sig-mixed-models wrote:
>> I see this code snippet suggested in the performance vignette:
>>
>> https://cran.r-project.org/web/packages/lme4/vignettes/lmerperf.html
>>
>> nlopt <- function(par, fn, lower, upper, control) {
>>      *.nloptr <<-* res <- nloptr(par, fn, lb = lower, ub = upper,
>>          opts = list(algorithm = "NLOPT_LN_BOBYQA", print_level = 1,
>>          maxeval = 1000, xtol_abs = 1e-6, ftol_abs = 1e-6))
>>      list(par = res$solution,
>>           fval = res$objective,
>>           conv = if (res$status > 0) 0 else res$status,
>>           message = res$message
>>      )
>> }
>>
>> That's writing an .nloptr object to .GlobalEnv (usually), but there's no
>> mention of why and I don't see any usage of this object anywhere else in
>> the code base:
>>
>> grep -Fr ".nloptr" lme4/R
>>
>> Am I missing something?
>> Mike C
>>
>> 	[[alternative HTML version deleted]]
>>
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