Bug in the examples from the JSS paper

[agila5]

Dear all, I just started learning the basics about FDA and your package and I think I've found a bug when replicating the code from the JSS paper. See below.

library(fda.usc)
#> Loading required package: fda
#> Loading required package: splines
#> Loading required package: fds
#> Loading required package: rainbow
#> Loading required package: MASS
#> Loading required package: pcaPP
#> Loading required package: RCurl
#> Loading required package: deSolve
#> 
#> Attaching package: 'fda'
#> The following object is masked from 'package:graphics':
#> 
#>     matplot
#> Loading required package: mgcv
#> Loading required package: nlme
#> This is mgcv 1.8-42. For overview type 'help("mgcv-package")'.
#>  fda.usc is running sequentially usign foreach package
#>  Please, execute ops.fda.usc() once to run in local parallel mode
#>  Deprecated functions: min.basis, min.np, anova.hetero, anova.onefactor, anova.RPm
#>  New functions: optim.basis, optim.np, fanova.hetero, fanova.onefactor, fanova.RPm
#> ----------------------------------------------------------------------------------
data(phoneme)
learn <- phoneme$learn
optim.np(learn, type.S = S.KNN, h = 3:25, Ker = Ker.unif)
#> Error in integrate(function(x) {: non-finite function value

^{Created on 2023-07-23 with reprex v2.0.2}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.3.1 (2023-06-16 ucrt)
#>  os       Windows 11 x64 (build 22621)
#>  system   x86_64, mingw32
#>  ui       RTerm
#>  language (EN)
#>  collate  English_United Kingdom.utf8
#>  ctype    English_United Kingdom.utf8
#>  tz       Europe/Rome
#>  date     2023-07-23
#>  pandoc   3.1.1 @ C:/Program Files/RStudio/resources/app/bin/quarto/bin/tools/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version   date (UTC) lib source
#>  bitops        1.0-7     2021-04-24 [1] CRAN (R 4.3.1)
#>  cli           3.6.1     2023-03-23 [1] CRAN (R 4.3.1)
#>  cluster       2.1.4     2022-08-22 [2] CRAN (R 4.3.1)
#>  codetools     0.2-19    2023-02-01 [2] CRAN (R 4.3.1)
#>  colorspace    2.1-0     2023-01-23 [1] CRAN (R 4.3.1)
#>  deSolve     * 1.36      2023-07-01 [1] CRAN (R 4.3.1)
#>  digest        0.6.33    2023-07-07 [1] CRAN (R 4.3.1)
#>  doParallel    1.0.17    2022-02-07 [1] CRAN (R 4.3.1)
#>  evaluate      0.21      2023-05-05 [1] CRAN (R 4.3.1)
#>  fastmap       1.1.1     2023-02-24 [1] CRAN (R 4.3.1)
#>  fda         * 6.1.4     2023-05-23 [1] CRAN (R 4.3.1)
#>  fda.usc     * 2.1.0     2023-07-22 [1] Github (moviedo5/fda.usc@8165866)
#>  fds         * 1.8       2018-10-31 [1] CRAN (R 4.3.1)
#>  foreach       1.5.2     2022-02-02 [1] CRAN (R 4.3.1)
#>  fs            1.6.3     2023-07-20 [1] CRAN (R 4.3.1)
#>  glue          1.6.2     2022-02-24 [1] CRAN (R 4.3.1)
#>  hdrcde        3.4       2021-01-18 [1] CRAN (R 4.3.1)
#>  htmltools     0.5.5     2023-03-23 [1] CRAN (R 4.3.1)
#>  iterators     1.0.14    2022-02-05 [1] CRAN (R 4.3.1)
#>  KernSmooth    2.23-21   2023-05-03 [2] CRAN (R 4.3.1)
#>  knitr         1.43      2023-05-25 [1] CRAN (R 4.3.1)
#>  ks            1.14.0    2022-11-24 [1] CRAN (R 4.3.1)
#>  kSamples      1.2-9     2019-05-20 [1] CRAN (R 4.3.1)
#>  lattice       0.21-8    2023-04-05 [2] CRAN (R 4.3.1)
#>  lifecycle     1.0.3     2022-10-07 [1] CRAN (R 4.3.1)
#>  magrittr      2.0.3     2022-03-30 [1] CRAN (R 4.3.1)
#>  MASS        * 7.3-60    2023-05-04 [2] CRAN (R 4.3.1)
#>  Matrix        1.6-0     2023-07-08 [1] CRAN (R 4.3.1)
#>  mclust        6.0.0     2022-10-31 [1] CRAN (R 4.3.1)
#>  mgcv        * 1.8-42    2023-03-02 [2] CRAN (R 4.3.1)
#>  mvtnorm       1.2-2     2023-06-08 [1] CRAN (R 4.3.1)
#>  nlme        * 3.1-162   2023-01-31 [2] CRAN (R 4.3.1)
#>  pcaPP       * 2.0-3     2022-10-24 [1] CRAN (R 4.3.1)
#>  pracma        2.4.2     2022-09-22 [1] CRAN (R 4.3.1)
#>  purrr         1.0.1     2023-01-10 [1] CRAN (R 4.3.1)
#>  R.cache       0.16.0    2022-07-21 [1] CRAN (R 4.3.1)
#>  R.methodsS3   1.8.2     2022-06-13 [1] CRAN (R 4.3.1)
#>  R.oo          1.25.0    2022-06-12 [1] CRAN (R 4.3.1)
#>  R.utils       2.12.2    2022-11-11 [1] CRAN (R 4.3.1)
#>  rainbow     * 3.7       2022-10-09 [1] CRAN (R 4.3.1)
#>  RCurl       * 1.98-1.12 2023-03-27 [1] CRAN (R 4.3.1)
#>  reprex        2.0.2     2022-08-17 [1] CRAN (R 4.3.1)
#>  rlang         1.1.1     2023-04-28 [1] CRAN (R 4.3.1)
#>  rmarkdown     2.23      2023-07-01 [1] CRAN (R 4.3.1)
#>  rstudioapi    0.15.0    2023-07-07 [1] CRAN (R 4.3.1)
#>  sessioninfo   1.2.2     2021-12-06 [1] CRAN (R 4.3.1)
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#>  SuppDists     1.1-9.7   2022-01-03 [1] CRAN (R 4.3.1)
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#>  withr         2.5.0     2022-03-03 [1] CRAN (R 4.3.1)
#>  xfun          0.39      2023-04-20 [1] CRAN (R 4.3.1)
#>  yaml          2.3.7     2023-01-23 [1] CRAN (R 4.3.1)
#> 
#>  [1] C:/Users/user/AppData/Local/R/win-library/4.3
#>  [2] C:/Program Files/R/R-4.3.1/library
#> 
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