[R] How can I fixe convergence=1 in optim

[Peng, C]

To change the default maximum number of iterations (mxit =100 for derivative
based algorithm), add mxit = whatever number you want.

In most cases, you need a very good initial value! This is a real challenge
in using optim(). Quite often, if the initial values is not well selected,
optim() can give you nonsense estimates even the algorithm converges after
number of iterations.  

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