R Under development (unstable) (2023-11-06 r85483 ucrt) -- "Unsuffered Consequences"
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> library(kappalab)
Loading required package: lpSolve
Loading required package: quadprog
Loading required package: kernlab
> 
> ## a set function
> mu <- set.func(c(0,1,1,1,2,2,2,3))
> mu
		set.func
{}		0.000000
{1}		1.000000
{2}		1.000000
{3}		1.000000
{1,2}		2.000000
{1,3}		2.000000
{2,3}		2.000000
{1,2,3}		3.000000
> is.kadditive(mu,2)
[1] FALSE
> is.kadditive(mu,1)
[1] TRUE
> 
> ## the Mobius representation of a set function, 2-additive by construction 
> a <- Mobius.set.func(c(0,1,2,1,3,1,2,1,2,3,1),4,2)
> is.kadditive(a,2)
[1] TRUE
> is.kadditive(a,1)
[1] FALSE
> 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.50    0.07    0.56