optif9(*np, *np, l, (fcn_p) fcn_expo, (fcn_p) 0, (d2fcn_p) 0,
D, typsiz, 1, 1, 1, &msg, -1 /* = ndigit */, 1000,
0 /* = iagflg */, 0, -1.0, 1.e-6, 0.1, 1.e-6, xpls, fpls,
gpls, itrmcd, a, wrk, &itncnt);inspired from what is in nlmefit.c from package nlme (also found in an older mail from Adrian Trapletti on R-devel).
It sounds that optif0 is not used anywhere in R.
EP
Emmanuel Paradis wrote:
Dear All,
I am trying to use the function optif0 (in main/uncmin.c) from the
latest R distribution. The reason is that I have a quite complicated
likelihood function which is coded in C, and I would like to optimize it directly.
To see how this works, I have tried with a very simple example: optimizing the likelihood of a sample using an exponential distribution. I have tried several solutions but none worked. I paste below the functions that come the closest to what should work. The compilation is fine and the call from R too. It seems that the call to optif0 does not do anything whereas everything else works.
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