[R] newbie needs help using R as solver
Andrej Uduč
odyn at email.si
Thu Sep 16 11:29:18 CEST 2004
Greetings
I'm a total newbie in R and I'm trying to make a comparisson of Excel
and R in the fields of:
- optimisation modeling (using solver)
- decision trees
- simulation modeling
as described in Winston, Wayne L.: Practical Management Science.
for optimisation modeling in Excel I would normaly use solver. In R
however I can't seem to be able to find the solution. I've narrowed it
down to optim, optimize functions (I might be totaly wrong), but I can't
figure out how to set the conditions. I've read something about nlm
model but I can't find the anwser (examples are not easy enough for me).
what I wanna do is solve this simple task:
a+b =< 500000
c+d =< 500000
g >= 0,25*c+d
a+b+c+d+g =< 1000000
a, b, c, d, g => 0
I would very much appreciate any help in this matter. I need to locate
the appropriate function for the task and figure out how to write this
formulas. I'd also be very thankfull for any help (links) to simple
examples of decision trees and/or simulation.
Andrej UduĂ¨
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