Dear R community,
I sent a question to the list a few days ago. Using nlm, I was unable to detect a
gradient in a four-parameter function that I had written in the region that I was
searching, even though the function surface clearly varied in the fourth significant
figure there.
I stumbled a
Hi R-community,
I wonder if anyone has dealt with this problem? I've written a negative
log-likelihood function of 4 parameters, and I want to minimize it. It doesn't have
derivative information (it actually requires running an external program). I can
detect a gradient in it, e.g.:
> toy.
