Used to inherit roxygen docs
checkIterArgs(gradtol, steptol, iterlim)
Parameter for the nlm optimisation - a positive scalar giving the tolerance at which the scaled gradient is considered close enough to zero to terminate the algorithm (see [nlm
doccumentation](https://stat.ethz.ch/R-manual/R-patched/library/stats/html/nlm.html)).
Parameter for the nlm optimisation - a positive scalar providing the minimum allowable relative step length (see [nlm
doccumentation](https://stat.ethz.ch/R-manual/R-patched/library/stats/html/nlm.html)).
Parameter for the nlm optimisation - a positive integer specifying the maximum number of iterations to be performed before the program is terminated (see [nlm
doccumentation](https://stat.ethz.ch/R-manual/R-patched/library/stats/html/nlm.html)).