Nothing
R/dfrmest_NLM.R
In nlr: Nonlinear Regression Modelling using Robust Methods
Defines functions
dfrmest.NLM
Documented in
dfrmest.NLM
#******************************************************************************
#* +------------------------------------------------------------------------+ *
#* | Function 'nlmest', M-estimate of a nonlinear function. | *
#* | Using combined Gauss-Newton and Levenberg Marquardt Method. | *
#* | Note: becarefull to using this function when there is not outlier, it | *
#* | may not work witout outlier, in this case better to use nlmest | *
#* | the problem is in part of two (p2) in hessian its big here. | *
#* | argumnts: | *
#* | formula: 'nl.form' object, the function mode. | *
#* | data: data, contains dependents and independents, | *
#* | data.frame, list or named matrix it can be. | *
#* | start: starting values, it must contains 'sigma', selstart | *
#* | for nl.form object is not created yet, take cre of it. | *
#* | robfunc: obust function, it must be functionformat untill know, | *
#* | not a nl.form, in feature it should be modfied. | *
#* | ...: can be entries for robust loss function parameters. | *
#* | vm: variance matrix for generalized minimization if NULL not | *
#* | generalized. | *
#* | | *
#* +------------------------------------------------------------------------+ *
#******************************************************************************
dfrmest.NLM<-function(formula,data,start=getInitial(formula,data),robfunc,
control=nlr.control(tolerance=0.01, minlanda=1 / 2 ^ 25, maxiter=25 * length(start)),vm=NULL,rm=NULL,...)
{
tolerance <- control$tolerance
maxiter <- control$maxiter
minlanda <- control$minlanda
trace <- control$trace
if(is.null(vm)) rm <- NULL
else rm <- eiginv(t(chol(vm)))
loc.start <- start
if(trace) plot(data[[formula$independent]],data[[formula$dependent]])
Fault2 <- Fault() ###### no error, automatically will be created by the Fault object
if (is.null(loc.start$sigma)){
dt1 <- c(data,loc.start)
ht <- eval(formula,dt1)
dv <- as.numeric(ht$predictor) - as.numeric(ht$response)
if(! is.null(vm)) dv <- rm %*% dv
loc.start[["sigma"]] <- mad(dv) # mscale(dv)
}
th <- loc.start ## with sigma
theta <- unlist(loc.start[names(loc.start)!="sigma"]) ## without sigma
theta1 <- theta ## without sigma
datalist<-as.list(data)
.parameters <- names(start)
p <- length(theta)
n <- length(data[[1]])
datalist[.parameters] <- loc.start[.parameters] #*****datalist contains both parameter vectors and data values
eol <- F
iterate <- 0
iterhist <- NULL
lambda <-1
names(th) <- names(loc.start)
ht <- dfr.robloss(formula,data,th,robfunc,control=control,rmat=rm,...) ## th: with sigma
if(is.Fault(ht)) return(nl.fitt.rob(Fault=ht))
tmp <- as.numeric(ht$ri)
if(control$robscale) sigma<-mscale(tmp) # <- nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
if(is.Fault(sigma)) return(sigma)
if(ht$Fault$FL) return(nl.fitt.rob(Fault=ht$Fault))
if(trace) lines(data[[formula$independent]],as.numeric(ht$fmod$predictor))
yresp <- as.numeric(ht$fmod$response)
ybar <- mean(yresp)
landa <- 1
alpha <- 1
fact <- 2
#///*************************************************
while (!eol) #///********* Start Iteration ****************
{
iterate <- iterate + 1
#cat("iterate ============================================= ",iterate,"\n")
grh <- attr(ht$htheta,"gradient") ## g(theta) grad
hsh <- attr(ht$htheta,"hessian") ## H(theta) hess
hshinv <- eiginv(hsh,symmetric=T,stp=F)
ilev <-0
if(is.Fault(hshinv)) ##################################### LM modified
{
# cat("singularity.. iteration= ",iterate,"\n")
heig <-eigen(hsh,symmetric=T) ## eig(f+land I) = (eig(F) +lnd)
#lambda <- abs(min(heig$values))*2 ## add the smallest minus eig to
lambda <-1
damping <- diag(dim(hsh) [2])
.temp1 <-heig$values
.temp1[.temp1<0]<-(1e-8)-.temp1[.temp1<0]
.temp1 <- diag(.temp1)
.temp2<-(heig$vectors) %*% .temp1
zeta <- .temp2 %*% t(heig$vectors)
zetainv <- eiginv(zeta,stp=F,symmetric=T)
if(is.Fault(zetainv)) return(nl.fitt.rob(Fault=zetainv))
delta2 <- zetainv %*% grh
repeat{
ilev<- ilev + 1
theta2 <- theta1 - lambda * delta2 #### without sigma
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
# cat("as.numeric(ht2$htheta)=",as.numeric(ht2$htheta),"as.numeric(ht$htheta)=",as.numeric(ht$htheta))
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
cnv <- sum((theta1-theta2)^2)/(sum(theta1^2)+(1e-8))
#cat("lambda = ",lambda,"(as.numeric(ht2$htheta)= ",as.numeric(ht2$htheta) ,as.numeric(ht$htheta),"\n")
if( (as.numeric(ht2$htheta) <= as.numeric(ht$htheta)))# || (cnv < tolerance/10000) )
{
theta1 <- theta2
ht <- ht2
#alpha <- alpha * fact
if(alpha > 1e10) alpha <- 1
break
}
else {
lambda <- lambda / fact
if( lambda <minlanda){
#sigma<- mscale(ht2$ri)
#lambda <- lambda * 20
return(nl.fitt.rob(Fault=Fault(FN=14,FF="nlmest.NLM")))
}
#alpha <- alpha / fact
if(alpha < minlanda) alpha <- 1
}
} ##################################### enf of LM
}
##################### end of singular case ####################
###################################################################################
else { ##################### Possitive definit case ###################################
landa <- 1
delta1 <- hshinv %*% grh
theta2 <- theta1 - landa*delta1
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
# cat("\n positive definit case---------------------------------------------------- \n")
# cat("as.numeric(ht$htheta)=",as.numeric(ht$htheta))
# cat("theta 1"=,theta1,"\n","theta 2 and delta=",theta2,"\n",delta1,"\n")
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
# cat("as.numeric(ht2$htheta)=",as.numeric(ht2$htheta),"as.numeric(ht$htheta)=",as.numeric(ht$htheta))
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
cnvg <- F
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
gradpk <- t(grh) %*% delta1
rate <- 1e-4 * landa * gradpk
.temp1<-as.numeric(ht2$htheta)
.temp2<-as.numeric(ht$htheta)
if(is.missing(.temp1) || is.nan(.temp1) || is.inf(.temp1) ||
is.missing(.temp1) || is.nan(.temp1) || is.inf(.temp1)) return(nl.fitt.rob(Fault=Fault(FN=18,FF="nlmest.NLM")))
if(as.numeric(ht2$htheta) > as.numeric(ht$htheta)){
###############################
while(landa >= minlanda){ ####### iteration landa ###
theta2 <- theta1 - landa * delta1
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
if(as.numeric(ht2$htheta) <= as.numeric(ht$htheta))
{
theta1 <- theta2
ht <- ht2
cnvg <- T
break
}
landa <- landa / fact
} ####### iteration landa ###
###############################
landa <- min(1,fact*landa)
#landa <- 1
}
else{
theta1 <- theta2
ht <- ht2
landa<-landa*fact
cnvg <- T
}####### iteration landa ###
###############################
if(!cnvg){
# ***********************************************
# **** non convergance using LM again. ****
# **** ****
# return(nlmest.LM(formula,data=data,start=th2,robfunc=robfunc,control=control,rm=rm,...))
heig <-eigen(hsh,symmetric=T) ## eig(f+land I) = (eig(F) +lnd)
lambda <- abs(min(heig$values)) * 2 ## add the smallest minus eig to
## to make all possitive
repeat{
ilev<- ilev + 1
I <- diag(dim(hsh) [2]) ### this ones better faster converge.
zeta <- hsh + lambda * I
zetainv <- eiginv(zeta,stp=F,symmetric=T)
if(is.Fault(zetainv)) return(nl.fitt.rob(Fault=zetainv))
delta2 <- zetainv %*% grh
theta2 <- theta1 - delta2 #### without sigma
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
cnv <- sum((theta1-theta2)^2)
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
if(as.numeric(ht2$htheta) <= as.numeric(ht$htheta))
{
theta1 <- theta2
ht <- ht2
break
}
else {
lambda <- lambda * 10
if( lambda > 1e12) return(nlmest.LM(formula,data=data,start=th2,robfunc=robfunc,control=control,vm=vm,rm=rm,...))
}
}
} # ******* enad of LM again ********
# **************************************************
} ####################### end positive ############
####################### from above theta1 & ht must be returned back ############
##########################################################################################
g2 <- attr(ht$rho,"gradient") ## V(heta) = [rho.(r1/sg) ..... rho.(rn/sg)]T
tmp <- as.numeric(ht$ri)
if (control$robscale) sigma <-mscale(tmp) # nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
if(is.Fault(sigma)) return(sigma)
th <-as.list(theta1) ## without sigma
names(th) <- names(formula$par)
th["sigma"] <- sigma ## renew with sigma
.expr1 <- t(attr(ht$ri,"gradient")) %*% attr(ht$ri,"gradient") ## J' J p*p
.expr2 <- eiginv(.expr1,symmetric=T,stp=F)
if(is.Fault(.expr2)){
cvg <- (diference < tolerance/100)
iterhist <- rbind(iterhist,c(iteration = iterate,objfnc = as.numeric(ht$htheta),
unlist(th),converge = diference, ilev=ilev))
}
else{
.expr3 <- attr(ht$ri,"gradient") %*% .expr2 ## J (J' J)^-1 n*p
.expr4 <- .expr3 %*% t(attr(ht$ri,"gradient")) ## J (J' J)^-1 J' n*n
.expr5 <- .expr4 %*% g2 ## VT = J (J' J)^-1 J' V n*1
angle <- t(g2) %*% .expr5 ## V' * VT 1*1
angle <- angle / sqrt( sum(g2^2) * sum(.expr5^2) )
cvg <- (angle < tolerance || diference < tolerance)
iterhist <- rbind(iterhist,c(iteration = iterate,objfnc = as.numeric(ht$htheta),
unlist(th),converge = angle ,ilev=ilev))
}
if(cvg) eol <- T
else if(iterate > maxiter) {
eol <- T
Fault2 <- Fault(FN=1,FF = "nlmest")
}
else {
ht <- dfr.robloss(formula,data,th,robfunc,control=control,rmat=rm,...) ## h(theta) = sum( rho(ri/sigma) )
if(trace) lines(data[[formula$independent]],ht$fmod$predictor)
if(ht$Fault$FL) return(nl.fitt.rob(Fault=ht$Fault))
tmp <- as.numeric(ht$ri)
if (control$robscale) sigma <-mscale(tmp) # nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
th["sigma"] <- sigma ## renew with sigma
}
#\\\********* **********************************************************************************
} #\\\********* End Iteration **********************************************************************************
#\\\*******************************************************************************************************************
#//////////*******************************************************************************************************************
#//////////*******************************************************************************************************************
#//////////******** preparing output ***********************************************************************************
#//////////******** ***********************************************************************************
if(! is.null(vm)){
rinv <- eiginv(rm)
#yresp <- rinv %*% as.numeric(ht$fmod$response)
#ypred <- rinv %*% as.numeric(ht$fmod$predictor)
yresp <- as.numeric(ht$fmod$response)
ypred <- as.numeric(ht$fmod$predictor)
}
else{
yresp <- as.numeric(ht$fmod$response)
ypred <- as.numeric(ht$fmod$predictor)
}
ybar <- mean(yresp)
nlrho <- 1 - sum( ( yresp - ypred ) ^ 2 ) /
sum( (ypred - ybar ) ^ 2 )
if(is.null(vm))
result <- nl.fitt.rob(parameters = th,
correlation = nlrho,
form = formula,
response = ht$fmod$response,
predictor = ht$fmod$predictor,
curvature = NULL,
history = iterhist,
method = fittmethod(methodID= 7,
methodBR= switch(control$robscale,4,5), ### rob or nopnrob variance
detailBR= "Newton Lev-Marq",
subroutine= "nlmest.NLM"),
data = as.list(data),
sourcefnc = match.call(),
Fault = Fault2,
htheta = ht$htheta,
rho = ht$rho,
ri = ht$ri,
curvrob = NULL,
robform = robfunc
)
else
result <- nl.fitt.rgn(parameters = th,
correlation = nlrho,
form = formula,
response = ht$fmod$response,
predictor = ht$fmod$predictor,
curvature = NULL,
history = iterhist,
method = fittmethod(methodID= 8,
methodBR= switch(control$robscale,4,5), ### rob or nopnrob variance
detailBR= "Newton Lev-Marq",
subroutine= "nlmest.NLM"),
data = as.list(data),
sourcefnc = match.call(),
Fault = Fault2,
htheta = ht$htheta,
rho = ht$rho,
ri = ht$ri,
curvrob = NULL,
robform = robfunc,
vm = vm,
rm= rm,
gresponse = transformNR(ht$fmod$response,rm),
gpredictor = transformNR(ht$fmod$predictor,rm)
)
return(result)
}
#******************************************************************************
#* +------------------------------------------------------------------------+ *
#* | End of optim.NLM' | *
#* | | *
#* | Hossein Riazoshams, UPM, INSPEM | *
#* | | *
#* | Recoded from 'nlmest' in Jan 2010 | *
#* | | *
#* +------------------------------------------------------------------------+ *
#******************************************************************************
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Defines functions dfrmest.NLM
Documented in dfrmest.NLM
#******************************************************************************
#* +------------------------------------------------------------------------+ *
#* | Function 'nlmest', M-estimate of a nonlinear function. | *
#* | Using combined Gauss-Newton and Levenberg Marquardt Method. | *
#* | Note: becarefull to using this function when there is not outlier, it | *
#* | may not work witout outlier, in this case better to use nlmest | *
#* | the problem is in part of two (p2) in hessian its big here. | *
#* | argumnts: | *
#* | formula: 'nl.form' object, the function mode. | *
#* | data: data, contains dependents and independents, | *
#* | data.frame, list or named matrix it can be. | *
#* | start: starting values, it must contains 'sigma', selstart | *
#* | for nl.form object is not created yet, take cre of it. | *
#* | robfunc: obust function, it must be functionformat untill know, | *
#* | not a nl.form, in feature it should be modfied. | *
#* | ...: can be entries for robust loss function parameters. | *
#* | vm: variance matrix for generalized minimization if NULL not | *
#* | generalized. | *
#* | | *
#* +------------------------------------------------------------------------+ *
#******************************************************************************
dfrmest.NLM<-function(formula,data,start=getInitial(formula,data),robfunc,
control=nlr.control(tolerance=0.01, minlanda=1 / 2 ^ 25, maxiter=25 * length(start)),vm=NULL,rm=NULL,...)
{
tolerance <- control$tolerance
maxiter <- control$maxiter
minlanda <- control$minlanda
trace <- control$trace
if(is.null(vm)) rm <- NULL
else rm <- eiginv(t(chol(vm)))
loc.start <- start
if(trace) plot(data[[formula$independent]],data[[formula$dependent]])
Fault2 <- Fault() ###### no error, automatically will be created by the Fault object
if (is.null(loc.start$sigma)){
dt1 <- c(data,loc.start)
ht <- eval(formula,dt1)
dv <- as.numeric(ht$predictor) - as.numeric(ht$response)
if(! is.null(vm)) dv <- rm %*% dv
loc.start[["sigma"]] <- mad(dv) # mscale(dv)
}
th <- loc.start ## with sigma
theta <- unlist(loc.start[names(loc.start)!="sigma"]) ## without sigma
theta1 <- theta ## without sigma
datalist<-as.list(data)
.parameters <- names(start)
p <- length(theta)
n <- length(data[[1]])
datalist[.parameters] <- loc.start[.parameters] #*****datalist contains both parameter vectors and data values
eol <- F
iterate <- 0
iterhist <- NULL
lambda <-1
names(th) <- names(loc.start)
ht <- dfr.robloss(formula,data,th,robfunc,control=control,rmat=rm,...) ## th: with sigma
if(is.Fault(ht)) return(nl.fitt.rob(Fault=ht))
tmp <- as.numeric(ht$ri)
if(control$robscale) sigma<-mscale(tmp) # <- nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
if(is.Fault(sigma)) return(sigma)
if(ht$Fault$FL) return(nl.fitt.rob(Fault=ht$Fault))
if(trace) lines(data[[formula$independent]],as.numeric(ht$fmod$predictor))
yresp <- as.numeric(ht$fmod$response)
ybar <- mean(yresp)
landa <- 1
alpha <- 1
fact <- 2
#///*************************************************
while (!eol) #///********* Start Iteration ****************
{
iterate <- iterate + 1
#cat("iterate ============================================= ",iterate,"\n")
grh <- attr(ht$htheta,"gradient") ## g(theta) grad
hsh <- attr(ht$htheta,"hessian") ## H(theta) hess
hshinv <- eiginv(hsh,symmetric=T,stp=F)
ilev <-0
if(is.Fault(hshinv)) ##################################### LM modified
{
# cat("singularity.. iteration= ",iterate,"\n")
heig <-eigen(hsh,symmetric=T) ## eig(f+land I) = (eig(F) +lnd)
#lambda <- abs(min(heig$values))*2 ## add the smallest minus eig to
lambda <-1
damping <- diag(dim(hsh) [2])
.temp1 <-heig$values
.temp1[.temp1<0]<-(1e-8)-.temp1[.temp1<0]
.temp1 <- diag(.temp1)
.temp2<-(heig$vectors) %*% .temp1
zeta <- .temp2 %*% t(heig$vectors)
zetainv <- eiginv(zeta,stp=F,symmetric=T)
if(is.Fault(zetainv)) return(nl.fitt.rob(Fault=zetainv))
delta2 <- zetainv %*% grh
repeat{
ilev<- ilev + 1
theta2 <- theta1 - lambda * delta2 #### without sigma
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
# cat("as.numeric(ht2$htheta)=",as.numeric(ht2$htheta),"as.numeric(ht$htheta)=",as.numeric(ht$htheta))
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
cnv <- sum((theta1-theta2)^2)/(sum(theta1^2)+(1e-8))
#cat("lambda = ",lambda,"(as.numeric(ht2$htheta)= ",as.numeric(ht2$htheta) ,as.numeric(ht$htheta),"\n")
if( (as.numeric(ht2$htheta) <= as.numeric(ht$htheta)))# || (cnv < tolerance/10000) )
{
theta1 <- theta2
ht <- ht2
#alpha <- alpha * fact
if(alpha > 1e10) alpha <- 1
break
}
else {
lambda <- lambda / fact
if( lambda <minlanda){
#sigma<- mscale(ht2$ri)
#lambda <- lambda * 20
return(nl.fitt.rob(Fault=Fault(FN=14,FF="nlmest.NLM")))
}
#alpha <- alpha / fact
if(alpha < minlanda) alpha <- 1
}
} ##################################### enf of LM
}
##################### end of singular case ####################
###################################################################################
else { ##################### Possitive definit case ###################################
landa <- 1
delta1 <- hshinv %*% grh
theta2 <- theta1 - landa*delta1
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
# cat("\n positive definit case---------------------------------------------------- \n")
# cat("as.numeric(ht$htheta)=",as.numeric(ht$htheta))
# cat("theta 1"=,theta1,"\n","theta 2 and delta=",theta2,"\n",delta1,"\n")
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
# cat("as.numeric(ht2$htheta)=",as.numeric(ht2$htheta),"as.numeric(ht$htheta)=",as.numeric(ht$htheta))
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
cnvg <- F
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
gradpk <- t(grh) %*% delta1
rate <- 1e-4 * landa * gradpk
.temp1<-as.numeric(ht2$htheta)
.temp2<-as.numeric(ht$htheta)
if(is.missing(.temp1) || is.nan(.temp1) || is.inf(.temp1) ||
is.missing(.temp1) || is.nan(.temp1) || is.inf(.temp1)) return(nl.fitt.rob(Fault=Fault(FN=18,FF="nlmest.NLM")))
if(as.numeric(ht2$htheta) > as.numeric(ht$htheta)){
###############################
while(landa >= minlanda){ ####### iteration landa ###
theta2 <- theta1 - landa * delta1
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
if(as.numeric(ht2$htheta) <= as.numeric(ht$htheta))
{
theta1 <- theta2
ht <- ht2
cnvg <- T
break
}
landa <- landa / fact
} ####### iteration landa ###
###############################
landa <- min(1,fact*landa)
#landa <- 1
}
else{
theta1 <- theta2
ht <- ht2
landa<-landa*fact
cnvg <- T
}####### iteration landa ###
###############################
if(!cnvg){
# ***********************************************
# **** non convergance using LM again. ****
# **** ****
# return(nlmest.LM(formula,data=data,start=th2,robfunc=robfunc,control=control,rm=rm,...))
heig <-eigen(hsh,symmetric=T) ## eig(f+land I) = (eig(F) +lnd)
lambda <- abs(min(heig$values)) * 2 ## add the smallest minus eig to
## to make all possitive
repeat{
ilev<- ilev + 1
I <- diag(dim(hsh) [2]) ### this ones better faster converge.
zeta <- hsh + lambda * I
zetainv <- eiginv(zeta,stp=F,symmetric=T)
if(is.Fault(zetainv)) return(nl.fitt.rob(Fault=zetainv))
delta2 <- zetainv %*% grh
theta2 <- theta1 - delta2 #### without sigma
th2 <- as.list(theta2)
names(th2) <- names(formula$par)
th2["sigma"] <- sigma
ht2 <- dfr.robloss(formula,data,th2,robfunc,control=control,rmat=rm,...)
if(is.Fault(ht2)) return(nl.fitt.rob(Fault=ht2))
cnv <- sum((theta1-theta2)^2)
diference <- abs(as.numeric(ht2$htheta)-as.numeric(ht$htheta))/as.numeric(ht$htheta)
if(as.numeric(ht2$htheta) <= as.numeric(ht$htheta))
{
theta1 <- theta2
ht <- ht2
break
}
else {
lambda <- lambda * 10
if( lambda > 1e12) return(nlmest.LM(formula,data=data,start=th2,robfunc=robfunc,control=control,vm=vm,rm=rm,...))
}
}
} # ******* enad of LM again ********
# **************************************************
} ####################### end positive ############
####################### from above theta1 & ht must be returned back ############
##########################################################################################
g2 <- attr(ht$rho,"gradient") ## V(heta) = [rho.(r1/sg) ..... rho.(rn/sg)]T
tmp <- as.numeric(ht$ri)
if (control$robscale) sigma <-mscale(tmp) # nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
if(is.Fault(sigma)) return(sigma)
th <-as.list(theta1) ## without sigma
names(th) <- names(formula$par)
th["sigma"] <- sigma ## renew with sigma
.expr1 <- t(attr(ht$ri,"gradient")) %*% attr(ht$ri,"gradient") ## J' J p*p
.expr2 <- eiginv(.expr1,symmetric=T,stp=F)
if(is.Fault(.expr2)){
cvg <- (diference < tolerance/100)
iterhist <- rbind(iterhist,c(iteration = iterate,objfnc = as.numeric(ht$htheta),
unlist(th),converge = diference, ilev=ilev))
}
else{
.expr3 <- attr(ht$ri,"gradient") %*% .expr2 ## J (J' J)^-1 n*p
.expr4 <- .expr3 %*% t(attr(ht$ri,"gradient")) ## J (J' J)^-1 J' n*n
.expr5 <- .expr4 %*% g2 ## VT = J (J' J)^-1 J' V n*1
angle <- t(g2) %*% .expr5 ## V' * VT 1*1
angle <- angle / sqrt( sum(g2^2) * sum(.expr5^2) )
cvg <- (angle < tolerance || diference < tolerance)
iterhist <- rbind(iterhist,c(iteration = iterate,objfnc = as.numeric(ht$htheta),
unlist(th),converge = angle ,ilev=ilev))
}
if(cvg) eol <- T
else if(iterate > maxiter) {
eol <- T
Fault2 <- Fault(FN=1,FF = "nlmest")
}
else {
ht <- dfr.robloss(formula,data,th,robfunc,control=control,rmat=rm,...) ## h(theta) = sum( rho(ri/sigma) )
if(trace) lines(data[[formula$independent]],ht$fmod$predictor)
if(ht$Fault$FL) return(nl.fitt.rob(Fault=ht$Fault))
tmp <- as.numeric(ht$ri)
if (control$robscale) sigma <-mscale(tmp) # nl.mscale(tmp,robfunc,...)
else sigma <- sum(abs(tmp)) / n
th["sigma"] <- sigma ## renew with sigma
}
#\\\********* **********************************************************************************
} #\\\********* End Iteration **********************************************************************************
#\\\*******************************************************************************************************************
#//////////*******************************************************************************************************************
#//////////*******************************************************************************************************************
#//////////******** preparing output ***********************************************************************************
#//////////******** ***********************************************************************************
if(! is.null(vm)){
rinv <- eiginv(rm)
#yresp <- rinv %*% as.numeric(ht$fmod$response)
#ypred <- rinv %*% as.numeric(ht$fmod$predictor)
yresp <- as.numeric(ht$fmod$response)
ypred <- as.numeric(ht$fmod$predictor)
}
else{
yresp <- as.numeric(ht$fmod$response)
ypred <- as.numeric(ht$fmod$predictor)
}
ybar <- mean(yresp)
nlrho <- 1 - sum( ( yresp - ypred ) ^ 2 ) /
sum( (ypred - ybar ) ^ 2 )
if(is.null(vm))
result <- nl.fitt.rob(parameters = th,
correlation = nlrho,
form = formula,
response = ht$fmod$response,
predictor = ht$fmod$predictor,
curvature = NULL,
history = iterhist,
method = fittmethod(methodID= 7,
methodBR= switch(control$robscale,4,5), ### rob or nopnrob variance
detailBR= "Newton Lev-Marq",
subroutine= "nlmest.NLM"),
data = as.list(data),
sourcefnc = match.call(),
Fault = Fault2,
htheta = ht$htheta,
rho = ht$rho,
ri = ht$ri,
curvrob = NULL,
robform = robfunc
)
else
result <- nl.fitt.rgn(parameters = th,
correlation = nlrho,
form = formula,
response = ht$fmod$response,
predictor = ht$fmod$predictor,
curvature = NULL,
history = iterhist,
method = fittmethod(methodID= 8,
methodBR= switch(control$robscale,4,5), ### rob or nopnrob variance
detailBR= "Newton Lev-Marq",
subroutine= "nlmest.NLM"),
data = as.list(data),
sourcefnc = match.call(),
Fault = Fault2,
htheta = ht$htheta,
rho = ht$rho,
ri = ht$ri,
curvrob = NULL,
robform = robfunc,
vm = vm,
rm= rm,
gresponse = transformNR(ht$fmod$response,rm),
gpredictor = transformNR(ht$fmod$predictor,rm)
)
return(result)
}
#******************************************************************************
#* +------------------------------------------------------------------------+ *
#* | End of optim.NLM' | *
#* | | *
#* | Hossein Riazoshams, UPM, INSPEM | *
#* | | *
#* | Recoded from 'nlmest' in Jan 2010 | *
#* | | *
#* +------------------------------------------------------------------------+ *
#******************************************************************************
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