Nothing
library("nleqslv")
# Dennis & Schnabel,1996,"Numerical methods for unconstrained optimization and nonlinear equations", SIAM
# example 6.5.1 page 149
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
}
xstart <- c(2,0.5)
fstart <- dslnex(xstart)
xstart
fstart
do.print.xf <- TRUE
print.result <- function(z) {
if( do.print.xf ) {
print(z$x)
print(z$fvec)
}
print(z$message)
print(all(abs(z$fvec)<=1e-8))
}
sink("dslnexCN-num.txt")
for( z in c("dbldog","pwldog") ) { # double dogleg, Powell (single) dogleg
for( delta in c(-1.0, -2.0) ) { # Cauchy step , Newton step
znlq <- nleqslv(xstart, dslnex, global=z, control=list(btol=.01,delta=delta, trace=1))
print.result(znlq)
}
}
sink()
sink("dslnexCN-char.txt")
for( z in c("dbldog","pwldog") ) { # double dogleg, Powell (single) dogleg
for( delta in c("cauchy", "newton") ) { # Cauchy step , Newton step
znlq <- nleqslv(xstart, dslnex, global=z, control=list(btol=.01,delta=delta,trace=1))
print.result(znlq)
}
}
sink()
z1 <- readLines(con="dslnexCN-num.txt")
z2 <- readLines(con="dslnexCN-char.txt")
all.equal(z1,z2)
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