R Under development (unstable) (2025-09-01 r88761 ucrt) -- "Unsuffered Consequences"
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> library(albatross)
> data(feems)
> cube <- feemscale(feemscatter(cube, rep(24, 4)), na.rm = TRUE)
================================================================================
> # progress argument must work, 1-component model must work
> system.time(
+ 	jk <- feemjackknife(
+ 		cube, nfac = 1, ctol = 1e-4, progress = FALSE
+ 	)
+ )
   user  system elapsed 
  11.62    0.63   12.25 
> stopifnot(is.matrix(jk$leaveone[[1]]$A))
> 
> cols <- list(
+ 	estimations = c('loading', 'mode', 'wavelength', 'factor', 'omitted'),
+ 	RIP = c('msq.resid', 'Emission', 'Excitation', 'omitted'),
+ 	IMP = c('score.overall', 'score.predicted', 'factor', 'omitted')
+ )
> for (n in names(cols)) stopifnot(cols[[n]] == colnames(coef(jk, n)))
> 
> stopifnot(all.equal(cube, feemcube(jk)))
> 
> # Also test parallel `bootparafac` with postprocessing
> library(parallel)
> cl <- makeCluster(2)
> system.time(jk <- feemjackknife(
+ 	cube, nfac = 1, ctol = 1e-4,
+ 	parallel = TRUE, cl = cl, .scheduling = 'static'
+ ))
================================================================================
   user  system elapsed 
   0.02    0.00    6.47 
> stopCluster(cl)
> plot(jk)
> stopifnot(is.environment(attr(jk$leaveone[[1]], 'envir')))
> 
> proc.time()
   user  system elapsed 
  12.48    0.73   19.93