R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> # test -- makecrm()
> library(spup)
> 
> data(dem30m)
> crm1 <- makeCRM(acf0 = 0.8, range = 300, model = "Exp")
> crm2 <- makeCRM(acf0 = 0.2, range = 700, model = "Sph") 
> crm3 <- makeCRM(acf0 = 0.8, range = 700, model = "Lin") 
> crm4 <- makeCRM(acf0 = 0.8, range = 200, model = "Gau") 
> 
> par(mfrow = c(2, 2))
> plot(crm1, main = "'Spherical', acf0 = 0.8, range = 700")
> plot(crm2, main = "'Spherical', acf0 = 0.2, range = 700")
> plot(crm3, main = "'Linear', acf0 = 1.0, range = 700")
> plot(crm4, main = "'Gaussian', acf0 = 0.8, range = 200")
> 
> proc.time()
   user  system elapsed 
   7.15    0.40    7.54