inst/scripts/Hobbs_3.R

In ArkaB-DS/nlsCompare: Compare the best parameter values and sum-of-squares involved in solving nonlinear least squares (nls)

# NLSProbName: Hobbs_3.R
# NLSProbDescription: {The Hobbs weed infestation problem to estimate a 
#    3-parameter logistic S curve in its unscaled form from a  
# starting point of (1,1,1) and lower=(0,0,0) and upper=(500,100,.25)
# }
# bound on b3 is lower than unconstrained solution value.

NLSstart <- list(b1=1,b2=1,b3=1) # Infeasible start
NLSlower <- c(0,0,0)
NLSupper <- c(b1=500,b2=100,b3=.25)
NLStag<-"bounded; bad start"