inst/iterationreport/dspure.R

In nleqslv: Solve Systems of Nonlinear Equations

# Dennis & Schnabel,1996,"Numerical methods for unconstrained optimization and nonlinear equations", SIAM
# example 6.5.1 page 149

library(nleqslv)
packageVersion("nleqslv")
.libPaths()

dslnex <- function(x) {
    y <- numeric(2)
    y[1] <- x[1]^2 + x[2]^2 - 2
    y[2] <- exp(x[1]-1) + x[2]^3 - 2
    y
}

jacdsln <- function(x) {
    n <- length(x)
    Df <- matrix(numeric(n*n),n,n)
    Df[1,1] <- 2*x[1]
    Df[1,2] <- 2*x[2]
    Df[2,1] <- exp(x[1]-1)
    Df[2,2] <- 3*x[2]^2

    Df
}

xstart <- c(2,0.5)

# \section{Report for the single (Powell) dogleg global method}
nleqslv(xstart,dslnex, global="none", jacobian=TRUE, control=list(trace=1,stepmax=1))