R Under development (unstable) (2026-02-09 r89390 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2026 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> 
>  library(trust)
> 
>  options(error = function() NULL)
> 
>  ##### TEST IMMEDIATE ERROR #####
> 
>  objfun <- function(x) stop("bogus error in objfun")
> 
>  trust(objfun, c(3, 1), 1, 5, blather = TRUE)
Error in objfun(theta, ...) : bogus error in objfun
$error
[1] "Error in objfun(theta, ...) : bogus error in objfun\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in objfun(theta, ...): bogus error in objfun>

$argument
[1] 3 1

$converged
[1] FALSE

$iterations
[1] 0

Warning message:
In trust(objfun, c(3, 1), 1, 5, blather = TRUE) :
  error in first call to objfun
> 
>  ##### TEST LATER ERROR #####
> 
>  objfun <- function(x) {
+      kiter <<- kiter + 1
+      if (kiter == 5)
+          stop("kiter reached 5")
+      ##### Rosenbrock's function #####
+      stopifnot(is.numeric(x))
+      stopifnot(length(x) == 2)
+      f <- expression(100 * (x2 - x1^2)^2 + (1 - x1)^2)
+      g1 <- D(f, "x1")
+      g2 <- D(f, "x2")
+      h11 <- D(g1, "x1")
+      h12 <- D(g1, "x2")
+      h22 <- D(g2, "x2")
+      x1 <- x[1]
+      x2 <- x[2]
+      f <- eval(f)
+      g <- c(eval(g1), eval(g2))
+      B <- rbind(c(eval(h11), eval(h12)), c(eval(h12), eval(h22)))
+      list(value = f, gradient = g, hessian = B)
+  }
> 
>  kiter <- 0
>  trust(objfun, c(3, 1), 1, 5, blather = TRUE)
Error in objfun(theta.try, ...) : kiter reached 5
$error
[1] "Error in objfun(theta.try, ...) : kiter reached 5\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in objfun(theta.try, ...): kiter reached 5>

$argument
[1] 1.0323820 0.1634548

$converged
[1] FALSE

$iterations
[1] 4

$argpath
         [,1]     [,2]
[1,] 3.000000 1.000000
[2,] 2.213163 1.617161
[3,] 1.995363 3.605266
[4,] 1.982307 3.929371

$argtry
         [,1]     [,2]
[1,] 2.213163 1.617161
[2,] 1.995363 3.605266
[3,] 1.982307 3.929371

$steptype
[1] "easy-easy" "easy-easy" "Newton"   

$accept
[1] TRUE TRUE TRUE

$r
[1] 1 2 4 4

$rho
[1] 1.132384 1.026844 1.000905

$valpath
[1] 6404.0000000 1077.9211880   15.1438205    0.9649301

$valtry
[1] 1077.9211880   15.1438205    0.9649301

$preddiff
[1] -4703.42125 -1034.99411   -14.16607

$stepnorm
[1] 1.0000000 2.0000000 0.3243678

> 
>  ##### TEST ERROR IN LAST #####
> 
>  kiter <- 0
>  trust(objfun, c(3, 1), 1, 5, blather = TRUE, iterlim = 3)
Error in objfun(theta, ...) : kiter reached 5
$error
[1] "Error in objfun(theta, ...) : kiter reached 5\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in objfun(theta, ...): kiter reached 5>

$argument
[1] 1.982307 3.929371

$converged
[1] FALSE

$iterations
[1] 3

$argpath
         [,1]     [,2]
[1,] 3.000000 1.000000
[2,] 2.213163 1.617161
[3,] 1.995363 3.605266

$argtry
         [,1]     [,2]
[1,] 2.213163 1.617161
[2,] 1.995363 3.605266
[3,] 1.982307 3.929371

$steptype
[1] "easy-easy" "easy-easy" "Newton"   

$accept
[1] TRUE TRUE TRUE

$r
[1] 1 2 4

$rho
[1] 1.132384 1.026844 1.000905

$valpath
[1] 6404.00000 1077.92119   15.14382

$valtry
[1] 1077.9211880   15.1438205    0.9649301

$preddiff
[1] -4703.42125 -1034.99411   -14.16607

$stepnorm
[1] 1.0000000 2.0000000 0.3243678

Warning message:
In trust(objfun, c(3, 1), 1, 5, blather = TRUE, iterlim = 3) :
  error in last call to objfun
> 
> 
> proc.time()
   user  system elapsed 
   0.15    0.03    0.18