[R] Non-linear system of equations

From: Radka Pancheva <radica_at_abv.bg>
Date: Fri, 25 Apr 2008 11:33:09 +0300 (EEST)


Hello R users,

I am trying to estimate the parameters of a bimodal normal distribution using moments matching, so I have to solve a non-linear system of equations. How can I solve the following simple example?

x^2 - y^2 = 6
x – y = 3

I heard about nlsystemfit, but I don’t know how to run it exactly. I have tried the following code, but it doesn’t really work:

f1 <-y~ x[1]^2-x[2]^2-6
f2 <-z~ x[1]-x[2]-3
f  <- list(f1=0,f2=0)

nlsystemfit("OLS",f,startvals=c(0,0))

Thank You in advance for your help.

Evgeniq Petrova



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