# [R] newbie needs help using R as solver

Vito Ricci vito_ricci at yahoo.com
Thu Sep 16 12:00:10 CEST 2004

```Hi,

it a LP problem. It's not just a function to optimize
(in this way optim() and optimize() are not usefull),
but a linear system grouping sever
equations/dis-equations.
See package linprog and boot.

http://www.ece.northwestern.edu/OTC/
http://www.isye.gatech.edu/~spyros/LP/LP.html
http://www.faqs.org/faqs/linear-programming-faq/

best
Vito

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
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
examples of decision trees and/or simulation.

Andrej Udu&#269;

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```