[R] Nelder-Mead with output of simplex vertices
therneau at mayo.edu
Mon Oct 12 15:24:01 CEST 2009
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I want to follow the evolution of a Nelder-Mead function
minimisation (a function of 2 variables). Hence each simplex
will have 3 vertices.
Therefore I would like to have a function which can output
the coordinates of the 3 vertices after each new simplex
is generated. However, there seems to be no way (which I can
detect) of extracting this information from optim() (the 'trace'
argument to 'control' does not seem to have provision for this,
according to '?optim', and I have tried it out without success).
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Why not put a cat() statement into "fn", the function that you supply
which optim is calling? That will give the vertices that it tries one
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