R Under development (unstable) (2024-08-16 r87026 ucrt) -- "Unsuffered Consequences"
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> library(minqa)
> 
> maxfn <- function(x)
+     10 - (crossprod(x, seq_along(x)))^2
> negmaxfn <- function(x) -maxfn(x)
> 
> (ans.mx <- newuoa(rep(pi, 4), negmaxfn, control=list(iprint=1)))
start par. =  3.141593 3.141593 3.141593 3.141593 fn =  976.9604 
At return
eval:  83 fn:      -10.00000 par:  7.63620  2.53057 -1.63870 -1.94531
parameter estimates: 7.63620390505104, 2.53056961139933, -1.63869581934617, -1.94531390526111 
objective: -10 
number of function evaluations: 83 
> 
> (ans.mxf<-newuoa(rep(pi, 4), negmaxfn, control=list(iprint=1,maxfun=25)))
start par. =  3.141593 3.141593 3.141593 3.141593 fn =  976.9604 
At return
eval:  25 fn:     -9.9998684 par:  7.63098  2.53325 -1.62866 -1.95574
parameter estimates: 7.63097842784621, 2.53325015042389, -1.62865964934577, -1.95574297694737 
objective: -9.99986839029905 
number of function evaluations: 25 
Warning message:
In commonArgs(par + 0, fn, control, environment()) :
  maxfun < 10 * length(par)^2 is not recommended.
> 
> 
> proc.time()
   user  system elapsed 
   0.23    0.01    0.23