[R] extracting parameters from vector
Ott Toomet
ecomus51 at oecon.au.dk
Sat Dec 30 12:30:31 CET 2000
Dear everybody!
Minimization algorithms usually assume the parameters are in the form of a single
vector. When calculating target function, e.g. log-likelihood, it is much more
pleasant to extract the vector into separate parameters and program the loglik
using them directly. Are ther any more intelligent ways to do that than just
write
sigma <- param[1]
beta <- param[1:1+N]
...
I know in GAUSS there is something similar to left-hand functions, i.e. you
can write
{sigma, beta, ...}= param;
(Sorry, i do not know GAUSS well, so I am not quite sure).
Perhaps it could be handled with lists somehow but I do not want to change the
assumption -- data are in a vector --, used by most minimization algorithms.
Thanks in advance
Ott Toomet
And a happy new year, BTW.
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